The 318 Poly Is My Favorite Boat Anchor
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- Опубліковано 20 тра 2022
- This is a breakdown of my personal favorite engine, my #318 #Poly, also known as the Mopar #Polysphere or Chrysler A Engine.
If you have questions as far as what specific parts are in this one or where to find them and I did not cover it in this video, let me know and I will do my best to help if you’re building one of these boat anchors yourself!
CAMCRAFT CAMS: www.camcraftcams.com/
TOTH PERFORMANCE: / toth-performance-poly-...
Not to mention the "Creamy"boatloads of torque!! What an engine. Splayed valves before the Cleveland and BBC's.
Poly 318!
I adore hearing Mopar fanatics talk about the Poly 318.
Mopar fans speak in hushed tones of regretful reverence and respect of this motor.
Thanks for sharing!
My first experience with the V8 about 35 years ago was a 318 polyhead truck engine. mounted in a -67 plymouth valiant 2-door post. fun combination of engine and car. Great someone, like you, has an interest in these cars and engines and will take care of them
After getting my license, my second car was a Fury III painted in Turbine Bronze with a 318 2BBL. I drove it for several years and loved it. It had torque, power and phenomenal gas mileage. It was comfortable and roomy with a big truck. I wish I could get another one. Most reliable starting engine I ever had and very low maintenance.
Great info. Liked lots, six engine capacities is what confuses people: 277,300, 303, 313, 318, and 325 cube engines with 11 long years of production. Down in Australia and New Zealand, we had Chrysler Royals with these, and the engines went a lot better than the alternatives. Chrysler was working the performance verses dollar equation more than any other car maker, so that's why so much interchanges with the LAs and Magnums. When Chrysler bought the Indiana plant from Studebaker, then it allowed the company to retool the whole engine to the new 273 and eventual 318, 340 and 360 powerhouses.
The 318 Polys were great engines. The original dual quads in the 58 Fury were hot performers. The 2 bbl version’s were so under carbureted that it’s amazing they ran. I swear the carburetor bores on those 2 bbl carbs were at best the size of a quarter and were more suited for use on a 4 cylinder than a V8 - yet they still ran quite well.
Really opened my eyes to the poly 318.....Im used to the LA engines and I appreciate what you showed on this awesome engine....not a boat anchor!!!
Love the rundown on your engine. Keep up the good work. No problem using any LA 318 dampner without remarking by using a later (1967?) timing chain cover which has the timing marks on the driver side. I like the poly 318 short blocks. Cylinders are thick and, as you pointed out, can readily take a .120 overbore. I've even heard rumors that some blocks, when sonic checked, can be punched out to a 340 standard bore size of 4.04 which is .130 over the 318's standard bore of 3.91 I recently purchased two 318 poly's specifically for the thick wall blocks and forged cranks to be used in my twin turbo 318 build. Cranks may or may not be stronger than, let's say, a SCAT forged crank but for less than half price of a SCAT crank I scored two short blocks. Gotta stretch the dollar when one has a beer income.
Early LA timing covers have the tab in the right spot but I should’ve mentioned that too. I’m the king of “after the fact” lol.
Glad to see there are others that love these boat anchors as much as I do lol
Just watch out for rust. Many engines of that age are rusted out. Sonic testing usually does not find it.
Straightforward, honest Austin with a real hot rodder spirit !
Schneider Racing cams has cams, Bruce did my heads, my intake was from Chrysler Performance. Gary Pavlovich is a great resource too
Everything about this car and engine is incredibly cool. Thanks for doing something different and interesting!
My dad's favourite engine. I have no direct experience with the polys, I do have lots of love for their LA descendants.
318 poly is great! Got one in my chrysler windsor 2 door -49 .
I really dig how you're original mopar oriented my first job was restoring old mopars everything from a chrysler straight 8 to slants, polys, big blocks and even the Australian 265 hemi six pack. Mopar or no car! Keep on keepin on
Only Mopar ride I ever had a was 89 Power Ram with a 360 and Holley Tbi from the factree. Hoss of a truck. Love the Car Austin 😎
Props to you for building the poly instead of swapping something else in. My eyes were opened to the potential of the poly a few years ago in one of the Mopar magazines that did a number of articles them.
You will pick up some Hp if you get rid of the flex fan for an electric. Those things eat alot of Hp. To find out how much better it will run take it off and put some shorter bolts in to hold the pulley and run her down the hwy. It will be noticeable. Just don't stop moving as you won't have any airflow.
Cant blame you for loving this engine. Was what Chrysler should have developed. Love my 360 la and the 318 but these are great heads on these polys. We didnt get many in Australia but my mate had a dodge similar to your machine. Pillarless dodge phoenix 383 . Wish i bought it off him . Love those big cars. A
Chrysler Power sells Wind Tunnel intakes and valve covers, And Heads are coming! Bruce Toth is an expert also.
Boat anchor my foot ! 318 poly is an excellent engine it makes tons of torque and will make good horsepower
when built right . You can find dual quad intakes in cast iron or aluminum Howard's also has camshaft for them
The best crankshaft is the flame hardend one out of the 318-3 truck engine also the la connecting rods are the same center to center length if. You experiment you can come up with a killer engine TRW makes power forged
piston for it . Best Wishes and Good Luck . 🇺🇸🇵🇷👍
318-3 truck engine..are you referencing an LA or a poly truck engine? The one I have is from a 67 box truck.
@@masterp2269 the poly it's flame harde
Man, you scored on that intake manifold.
Every Mopar is little more than any other,
Every Mopar is worth it
I'm fact, if you Say MOPAR out loud, you probably owe someone 50$ bucks..
Great Post Dudes..
Keep at it..
Awsome video!
I would like to ad that later LA engines with factory throttle body fuel injection have timing chain covers that do not have the opening for the mechanical fuel pump machined. It is solid.
There are also covers that are available to close off the opening so it is not absolutely necessary to change out the timing chain cover if you want to use an electric fuel pump.
Great info, and awsome job!
Glad to see you putting in the time and effort on your channel!
👍😁
Thank you for sharing your earned knowledge of that engine.
I am sure it has already helped someone out.
Years ago I was trying to figure out all the differences between the small block LAs and the 5.2, 5.9 magnums.
Back then there was no information in one spot that went through both engines and listed the differences.
So I ended up doing what you did in order to educate myself.
Uncle Tony did a great video (last year?) Comparing the two.
I also have a couple vids pointing out the differences, (not as good or entertaining as Uncle Tony.)
Keep up the great work!
👍
Austin , like your channel . You're doing a great job! keep it up !
Good stuff! I’ve got a very trick 402ci stroker Poly, in a ‘65 Sport Fury, 90thou over, the heads are a work of art, like you a Weiand inlet, QFT 750 double pumper, Eagle crank n rods, custom pistons, trick adjustable rockers, .525 lift Schneider cam, 2.02 11/32 stem stainless inlet valves, can’t remember the size of the exhaust valves but as big as you can go, bronze guides, fully ported and port matched, 11:1 comp ratio, TTI headers for manual steering, all balanced and blueprinted, fluid dampner, comp cams timing set, aftermarket modded 340 4 bolt main bearing caps, the high volume oil pump as in yours, car goes like a scalded cat and sounds like a hot gen 2 Hemi, I’m the first in the U.K. to do this and it’s cost me loads! Mr Gary Pavlovich and was my guru and I cannot thank him and my good engineering friend John Hatchard enough for their help in creating this, I’m now looking into EFI for it. It’s been a great and continuing adventure. My ambition is to try and get 600hp out of it, probably around 450-500 at present and makes massive torque!
This is Exactly the Poly build story that I was looking for. Thank you
Good info! My brother and I had a 64 fury 4 door 318 3 on tree! Always missed that car. Nothing to worry about in parking lot. Had over 375k on it when I lost track of it. We used it during winter to jump the new cars it started like a Timex watch.
Awesome video. Recently got a 59’ D-500 dump truck with a semi hemi.
Great video youngster. Very informative. Keep it up.
Thank you for the info. Now I may keep my 66 Fury1, now that I've got places to check
Thanks for showing us your really unique engine. I learnt a lot. You have really come a long way since we first saw you on UTG. Top job Austin.
Dan from Australia
Thank you very much! Great build! I am new to the Poly Head. Great info brother. Peace!
Love these motors!! Poly head 318, and the magnum 318 are my favorite two versions..
I got 2 of these in a 64 dodge 330 and a 67 fury.
They got a little bit of power to get me down the highway and the fuel economys not to bad either
We used to call them Thick Wall 318s.
Very informative you gave me the information I needed thank you
Any stroker crank and rods meant for a 318 LA will fit a poly back in the day people use to bore them to 4inch40 over and put 340 piston s in them and used LA W2 Mopar heads yeah there heavy but they have a really stout lower end as a result
The main difference in weight is the heads and intake. Dimensionally the 318 A and LA blocks are the same.
Nice breakdown of the poly vs LA small blocks.
What people don't realize about the poly engines, is that while they are not great for high rpm horsepower or racing, when it comes to performance and torque under 5000 rpm, say for a reliable, fuel efficient mil that provides great throttle response for every day driving, it is hard to beat, and worth the money.
That engine sounds great in all the video's.
I had an angle plug aluminum 440 in a B body. The only headers that would work were TTI. I recomend them.
Poly engines are canted valve heads like BBC and Cleveland/ 460. There is different versions and chambers but all the same basic head. Rockers at least exhaust are the same as a 273 A engine. I think with some work they will make very good power, better than a 318LA.
You can use late 318/360 rods in them. Getting a good piston is however the issue. Later engines will take a LA flywheel as well.
Great video, 👍 you should get rid of that 6 blade fan they rob like 10 or 15 hp.. slap an electric unit on there
A few things you overlooked: The camshaft in the poly is the same shape (bearing journals, length, timing gear connection, and oil pump drive gear) as the LA camshaft but the cam lobes are positioned differently. It would be easy for any cam grinder to use an LA camshaft blank & grind it to the poly lobe configuration provided they had the profile on hand. Also, Oregon cams can regrind your old cam to a slightly higher lift. Crankshaft & rods are different than newer LA engines. I use the term newer because the 273 & early 318 LA engines used a forged crankshaft & lighter rods. The 318 cast crank will fit just fine if you use the rods for that application. Cast crank rods are a lot beefier and are the same as the 360 rods. I know this because I have build a 65 poly using a cast crank. Just use the main bearings for the later LA engine. Like you said the LA pistons will work just fine except for the valve reliefs. A good machine shop could cut them. The key word there is "Good". Canada continued to use that engine for quite a long time after we discarded it. They were also used in a lot of industrial/ marine applications, they were very tough because they were made from high nickel iron. Yes, Toth machine has done a lot of work with these engines.
I remember that Wieand manifold be listed in a PAW catalogue(now out of business). It stated it would fit the poly as well as the early Hemi. A factory manifold from a hemi probably be hard to find, heavy, and expensive.
That is great looking engine
They made quite a few twin 4 bbl intake manifolds for those back in the day. I have no doubt you could find on at the MoparNationals of specialyty swap meet like that.
Found one at MoParty for 425…but I didn’t pick it up. I’d be tempted to spend another 1000 on carburetors to make it work lol.
But, I do have another Polyhead to build.
I like the 318 poly because it has the 1st gen hemi I take ports. But you can put any small block chrysler bottom end. Even a stroker kit.
Yeah I forgot to mention that, although I have no first hand knowledge of doing that to a poly. From what I understand, some machining needs to be done to the crank to fit it properly but I find conflicting claims related to that and I’m not 100% sure if it’s necessary or not.
@@DaddysMoneyGarage Maybe ask the old man @ UTG?
Polys are the most under rated Mopar V8. The block will take an LA stroker crank and with proper porting the heads will fill the cylinders. The intakes are the hardest thing to get. There was a very nice dual plane available a while back that was a Poly version of the Hot Heads early hemi intake.
Had a PAW parts catalogue a few years back that listed a Wieand four bbl. intake that would fit the poly or early Hemi engines. The pistons in the poly are flat-tops, and could be used in Y-blocks, bored to the max. Try Silvolite pistons.
@@jeromebreeding3302 The early hemi's were also available with poly heads (budget engines). Intakes interchange between hemi and poly versions of the same engine. There is no parts interchange between the early hemi/poly and the A engine poly that I am aware of.
Designed and overbuilt in the days of quality and integrity, the A block 318 with it's superior canted valves and semi- hemi head design was 30 horsepower stronger than the LA 318 that replaced it, but almost as heavy as a 440, and be bored and stroked to 440 cubes, at which point it would make more power with it's better semi hemi combustion chambers. Very nice engines! Nice job with the car and video!
@@arthurrose6473 Agreed. The stagered valve arrangement on the poly, was copied by both Chevy and Ford. Chrysler should have developed the engine further, but with the Hemi archetecture of the block(HEAVY), it was handycapped, especially with the Advent of "thin-walled" casting techniques.
A couple more things. Harmonic balancer: The ones for the later LA engines will fit OK but, like you said, the timing mark is on the wrong side. Simple solution: locate TDC #1 cylinder & mark the balancer accordingly then use a dial back timing light for the ignition timing. You will have to use later LA pulleys also because they align differently. It's a good idea to go through this, it will save some aggravation later on. On the headers: The exhaust center to center distance on the poly is the same as a Phord 302/ 351 engine. I have toyed around with the idea of fabbing a set of shorty headers using poly flanges (available on Ebay) and welding on a set of Ford pick-em-up shorty headers. They would fit on a pick up but probably not a passenger car W/ power steering.
Polys get a lot of hate just because it's hard to find parts. BUT they can make one hell of a setup. I think a lot of Aussies still make or made hop up parts for the poly.
Austin, great no-nonsense description of your poly head engine. The heavy block, forged crank and high volume oil pump suggest Chrysler was after a strong, hard working durable motor that would be suitable for commercial usage. I don't imagine it will give you any problems even if consistently driven hard.
That is exactly what they were made for. They were in a lot of trucks and were the base V8 for cars of the time. They were replaced because of their weight, essentially, and I believe that was a mistake. They’re very reliable and make more power with a 2 barrel setup than the 318LA does with a 4 barrel off the showroom floor.
@@DaddysMoneyGarage The truck Polys have different heads than the car poly as they are a point lower in compression they are easily identified by the giant 7/8" thread spark plugs.
That’s odd, because this Poly came out of a 64 Dodge pickup and uses the same plugs as the factory Polyhead out of this car(which I still have in my shed). I have never heard that.
@@DaddysMoneyGarage One tons and up got the premium 318-3 poly. They had stellite faced valves tri metal bearings, hydraulic lifters and floating piston wrist pins as well as a forged hardened and shot peened crankshaft. It was rated 202hp@3900rpm and 288ft-lbs at 2400rpm. They all had 2bbl carbs.
The Poly 318 came in a version mounted in a Commander Cammando. It had 2 4bl carbs and developed an honest to God 325 HP as told by a dyno run. The main problem the Poly had was it was undercarbed with that puny 2bl. Theh average 318 poly was rated at 240hp with a 2 barrel. When they introduced the Wedge 318, it was rated the highest at 220. They way the Poly orginated was when Chrysler decided to introduce a V-8 to Plymouth who, up until then, only had straight 6s. They could have put the 354 (rated at nearly a hp per cube when equipped with dual quads) but Plymouth was their economy branch and got the smaller 315cid Hemi with the poly heads. When it was introduced in 1955, it was the A318 Poly and was only 20 hp less than the hemi 315 from dodge.
i had a 65 fury 1 wagon back in the early 80s i bought for 35$ it had a 318 poly...it ran good but i didnt keep it....i sold it for 100$ and bought a 73 barracuda for 150$....didnt keep that either slod it for 250$ and bought a 68 chevelle for 50$ and on and on.....i like them
Great video!!👍do u by chance have your part#s/sources for Auto trans kickdown linkage looks like what you have bolted right on the Weiand and anything else you would recommend getting for the weiand Edelbrock install. Planning on putting one on my 66 Belv this summer. Thanks!
I have a fully built poly with forged pistons,head studs, main girdle,h beam rods, special ground turbo camshaft, short filled the block, and the heads have been fully built with special cut down LS valves 2.05 x1.625 and a pair of hx40 turbos ,I used a set of turbo LS headers by cutting off the flange and welding on poly flanges, crunching all the specs computer says it should make 622hp at 10psi and 840 at 18psi!,had planned on using the super sniper set up but have been talking with a guy who did a blowthru set up using a predator carb,so since I have a fresh rebuilt one sitting on the shelf I'm going to try it out see what happens! He says his was good to 12psi and that's about were I want to limit mine!! Costs way to much to push past that!!
you can make LA pistons work, as well as a lot of other parts
Thank you and Well Done, came across a poly, that will suit my needs for a stationary engine, do you still have the stock intake and exhaust that you might part with?
So I just bought a 66' Fury 2dr hard top
And it has a poly 318 (casting #2468230)
So you are a godsend for me right now because I want to keep the original motor in the car. I want to keep it a good driver rather than try to make a racecar.
Intake is gonna be a pain .... mine has a 1 barrel x-x
Not sure they came with a 1bbl...the little 2bbl Stromberg looked like a 1bbl from above!
I've owned over 100 mopars over the year's and have never had a poly, I don't have anything against them for some reason I just never had one I've had several 65 and 66 belvedere's and satellite's but always had 273's I wish I'd had a poly, one just never came my way!
Had a 66 ..2 dr post when I was 16 383 police car had spot light on each good running car put 260000 on it just changed plugs and oil
Gotta love those polys 🤙🤙
How much Hp dose that put out great video
4bbl intakes were factory from 57 - 62 the first poly 318 was 57, the 56 had polys but were 277 and 303 displacement A engines the 56 270 dodge engine was a poly, but not the same family as the A poly
If I understand correctly, those very early poly had more in common with the early hemi (same block?) than the later A/LA/Magnum engine families.
Would like to hear it idle. Would like to know estimated horsepower, torque, gas mileage. How long did it take to source parts
Took about a year to get all the parts together, but a good half of that was researching the info I just put into this video lol. Finding the right people is the time consumer of this project, or maybe most projects.
Hey Austin when doing the paperwork online for the Vermont loop-hole how do you give them a copy of the nada page?
You have to print off all forms and send them in the mail. All I did with the NADA page is take a screenshot of it on my phone(make sure it includes the year, make, and model of the car in the screenshot) and print it off to send with the paperwork.
I meant the LA 318 engine but polly head engine can be custom built as well
What is your thoughts on the Chrysler 4.7 sohc engine that had a similar valve arrangement to this Poly 318?
Was this the first small block to have this valve arrangement head design out of all the manufacturers?
If not keeping the factory crank what are your options? LA cranks no fit? are stroker engines possible or is there a lack of room or lack of parts?
Years ago I read a lot on Gary Pavlovich builds...if I remember right he was in a Poly group on Yahoo...he had a full build sheet for a 402 Poly stroker. I believe there was a Mopar Performance stroker kit and his build made 500hp with a 4bbl
There’s plenty of those Chrysler 318 V8 engines around despite it’s a fleet engine but there’s plenty of performance parts even Aluminum heads and intake manifold and carburetor combination
Are you referring to the Poly 318? Or the LA/Magnum 318s?
@@howiefeltersnatch2973 it’s both depending which engine you’re building
@@calvincrews3885 I'm not seeing this huge aftermarket you speak of for the Poly engine. I am definitely intrigued tho
@@calvincrews3885 I would LOVE to know where this abundance of intakes, cams and such can be found for the 318 Poly A block can be found. Yes they are easy to find for the LA 318 but not so easy for the Poly/A block 318.
Gidday I'm rebuilding my 318 poly pistons are an issue my block is 60tho I need a set of larger ones I also havea 313 block 40tho I live in new Zealand so exchange rate makes it expensive I recon they are a great unque engine
Awesome car would be a cool motor to build. In my opinion way cooler than an la engine
But why do the stickers read 323? Did you maybe make them to reflect the current overbored displacement?
Yes.
@@DaddysMoneyGarage They looked factry!
@@noisefuljoy thanks! They also have the added effect of confusing everyone at events, including Mopar people lol
awesome 😂
I have 65 and 66 poly motors. About to swap in the 66 which is a runner in my 65 dodge polara 440 2 door, pretty sure it's stock. Any suggestions to just get driving?
How much power do you feel the head work added? I have the same build except the head work. Also, did you increase the compression when you swapped pistons?
It’s a hard gauge because the original poly in my car was so worn out that it would not be able to provide a good benchmark for the power gain with the head work. However these heads have been milled .010 and the block decked .005. With the pistons in this engine it brings the compression to about 9.5:1 if I remember correctly. Factory is 8.5:1.
Did you have to mill the manifold with the deck and head milled? It’s some good dough to build a Poly, would you do it again?
@@maxd2015 no the intake still lined up just fine.
And yes, I would do it again. In fact I have another one I’m considering building on this channel after the Jet is done. Gonna have to take out a second mortgage and sell the other kidney I have left after building this one, but I’ll do it.
was this stock with an alternator and did it have a dual brake master cylinder in this from the factory?
No. It had a roundback alternator(no longer available). The squareback replaced it and has one more ground than the factory roundback, and for months I kept blowing voltage regulators until I learned about the extra ground. Hooked it up, grounded it out, and that fixed it.
Originally the car had a single master cylinder. I swapped that out for a master out of a 1968 Fury, swapped the splitter block for a later one, and replaced all the brake lines with stainless steel. Much, much safer.
@@DaddysMoneyGarage yeah i was talking with luke thunderhead 289 guy. he is really a luddite and likes the old archaic technology on cars and trucks. I get that but he was saying that he doesn't even like brake boosters and likes regular manual brakes. Id rather have the extra security of stopping sooner cuz there are so many idiots on the road!
Cool that’s exactly what I paid to!!🙌🏼🤙🏻
What do you have for exhaust setup?, I know you have TTI headers but after that?
Cherry bomb glasspacks and 2 cherry bomb resonators with an h pipe.
@@DaddysMoneyGarage watched a video on Uncle tony’s Garage where you swapped the carbs, sounds mint💪🏻, greetings al the way from South Africa, I have a 1967 Dodge D100 that I am rebuilding, has a 225 Slant in but bought a 318 Poly that I am building to put in later on💪🏻
Wide block!
Looks almost like a Oldsmobile motor. It's a clean looking motor tho.
How much hp does the Polly 318 have
Will a tranny and starter from an LA bolt up to the poly?
Yes, they will, but one bolt hole will be in the trans that will not have a corresponding hole in the block. It is inconsequential, though, and a lot of people who build polyheads just don’t worry about it.
I have the same intake the same corporator the same Headers I am running at 6:50 But it still pops through the corporator any advice
It's not a valve Did you have trouble with too much gas making it pop through the carburetor and what size carburetor should I use
@@joethompson61 the Weiand Intake is a total bathtub of an intake and the way I made mine more streetable was to put the 650CFM carburetor on it, Jet it a little richer, and put a 4 hole spacer on it to help increase the velocity of the air through the carburetor. This seemed to help the fuel atomize better in the gigantic plenum and fixed a lot of my low end issues. But that is my experience.
@@DaddysMoneyGarage Could you do a video on it
@@DaddysMoneyGarage Mine is a 65 fury 3 2 door hard top
@@DaddysMoneyGarage I am really struggling with it it is very very boggy midway through gear And we'll pop through the carburetor Once passed the bugginess it runs like a bat out of h***
How do you tell if it's a poly head.
The scalloped valve covers are a dead giveaway. Also, most polyheads will have 2 bolts for the valve cover, one on each end. Some have a third bolt in the middle of the covers. The evenly spaced intake runners and exhaust manifold pipes are a giveaway as well. Not to mention the sheer size of the thing.
LA pistons fit , but it ends up with low compression
i always thought a BBC was a boat anchor
You should have started it up so we could hear those headers and exhaust
Yeah, I know, I forgot. But there will be a lot more on this car/engine and I’ll run it in a video soon. It sounds great.
Prettiest Dodge colors always thought Petty blue but,,,,,
were's poly Gary ?
You did not fire it up we didn't get to hear it run!
Why do they call it a “Poly” ?
Poly is short for polyspherical. This is the description of the head combustion chambers just like hemis and wedges. In fact the original poly was developed from the first gen hemi. They wanted something lighter, less complex, and easier to assemble/maintain than the dual rockershaft hemispherical engines so they modified the design of the hemi head enough to get the rockers on one shaft. Thus, the poly was born.
Shorts don’t go over well with me. One more and I’m gone. This isn’t Fakebook.
thats alot to ask of a ordenary youtube guy.
.whats the problem with wearing shorts?