Ford F100 390 Dyno Day
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- Опубліковано 5 жов 2024
- Quick video today putting the rebuilt 390 on the dyno, to see how much power this budget build puts to the ground.
Rebuild Parts List:
390 Crank & Rods
Used 360 Pistons
10:1 Compression
Speed Pro piston Rings
Comp Cam 270H Kit
www.summitraci...
Headman Headers
www.summitraci...
Amazon HEI distributor
amzn.to/3wpRCNQ (affiliate link)
Holley 670 Steet Avenger
4 barrel "T" junkyard intake manifold
8 exhaust valves & Valve seats.
Melling oil pump
2.5" X pipe with Black Widow Venom 250 mufflers
Links to previous videos:
Dyno Day #1 - Original Motor
• 1969 F100 Dyno Run and...
Rebuild details & parts list -
• Ford 390 Engine Rebuil...
First Start after rebuild -
• Ford 390 - First Start... - Авто та транспорт
Man... Haven't seen 3 in the tree in a Long Long Time. Done my heart good! Had a 73 F100;4x4 390 w/Granny 4speed
What a joy to see you run through the gears with a 3 on the tree! Been a mighty long time since I've seen (driven) that. Thanks!
100!
Just wanted you to know that 3yrs later, this vid is still doing God's work for some of us! It's also the exact vid I needed to come across as I'm looking to do the same to my tired 360 that's been stroked out to a 390, you listing what you did and the parts you used, was the cherry on top for me, so thank you! BEAUTIFUL, yes, BEAUTIFUL looking and sounding truck! Good on you!! Take the advice of this old man, it's paid for and perfect, don't ever sell it!!
I was bummed that your engine did not make at least 300 HP to the rear tires. The Ford cast iron intake is holding it back. An Edlebrock high rise dual plane intake would most likely get it there plus. Those old cast iron intakes are very restrictive. It will also make a ton more torque. You have everything else in place to make over 335 HP which is what that engine should easily make. Another great video! Enjoyed it.
I would agree but I think those stock heads won't let it get much more HP I didn't see what castings they were but to the crank, a decent stock FE head are really only good to 350hp. So to the wheels he would prob be limited to 300hp. But I think he's putting a ls anyway :(
@@connorrichardson2580 he can do more
@@Pedrofitbulls he could turbo it. N/A your heads limit your HP everything else you do just gets you closer to the limit.
@@connorrichardson2580 I’m doing my 390 too so you saying I can add a turbo plus the intake everything I would love a turbo in it
@@Pedrofitbulls ya you can turbo anything really, you need a blow through carb and some other stuff. I've never done it myself tho.
Man I love old ford trucks !
Love the 3-on-the-tree! I know they are not great, but I really liked driving my old Chevy pickup with one. Plus, it was a great theft deterrent, none of my friends or family could drive it!
Great video, thanks for sharing.
Man, that made my heart stop for ya when that shroud let go. I thought "this dude can't catch a break". Awesome videos, just found them today. Sweet ride. Sounds and looks like it runs great. 👍
Sounding mean, a great looking truck, I just love the patina!
Patina is another word for im too lazy to restore
@@obsessedwithcars219 No, it's easy to slap on a paint job, keeping a truck original is an art!
Whatever numbers you wind up with, it will be plenty healthy and tons of fun for that truck! Loving it!
I bought a 390FE from a salvage yard in San Antonio a couple years back that was in excellent shape for my 77 Ford F150. With the Holley 700CFM double-pumper I had on it and a Crane Racing Cam it was putting out 335 HP and 377 torque. I took it down to see if I could bore it more and found it was at it's limit but a buddy of mine said put 428 crank in it and some wedge pistons and re-timed it. I got her up a little over 400 HP. I wish I had kept that truck I would have donated that engine to ya. In that light F100 that thing would rock! Really enjoying your series on the F100!
TxCowPoke 400 hp ha ha ha ha few bolt on a 350 chevy can get more than that ha ha junk fords
@@Wanous-hv7zo It was a hunting truck for off road...not a hotrod! I own 1969 Chevelle SS 396 so now what's your gripe with that?
TxCowPoke 2 wheel drive for off road? Thats not going to go anywhere
@@Wanous-hv7zo you are one dumb-ass
@@Wanous-hv7zo BS
I would have thought you could get about 300-315 hp out of that setup.... Love the truck and the build. Good update.
strangled with stock heads. 42hp per litre really is still very unefficient.
The power is in line with a near stock combo with a cam and exhaust. It's about 315-320 hp at the flywheel ( 267hp + 20% loss in the drive train ( 53 hp ).
@@hoost3056 My 281ci 4.6L 2v is making 309rwhp 321rwtrq @5,446rpm, but i got TrickFlow 38cc heads n MHS TFS stage 3 n/a cams..lol
You seem like you have the right mentality for this kind of thing. Keep it up 👍💪
Did a build with the 390 stroked to 420 inches and the numbers at the track suggest 330 at the wheels with 450 lb feet . The old truck runs 12.08 at 110. Love the old 390s next up for mine is a head swap, survival motorsports stage x CNC heads. If your into 390 fe motors I would check out survival motorsports. Dude, Barry Robotnik has serious FE engines in the engine masters competition ever year and has won a few with the old FE platform.
I actually picked the cam for this engine based on the survival motorsports web page and videos! Those guys have some really nice stuff. 450ft-lbs is a serious amount of torque to put down, thats probably a fun car to drive
@@330_garage3 it's an old 1977 ford f100 stepside. With 3.89 full spool rearend and a built c6 . I also moved the engine all the way back to the firewall and lowered the whole thing.
The intake and ignition are a roadblock to a decent increase in power. A CDI ignition system providing the spark for a Hall effect trigger electronic distributor that's been recurved. And the addition of a classic Edelbrock Streetmaster intake manifold would provide you with a noticeable increase in power without question. The comp 270h cam isn't giving you what you could get from a Comp Cams 268H which is fantastic in a mild 390. It's significantly better for mild 390 than that 270 is. The 270 is pretty damn good in a 428 but a 390 can't take full advantage of it's potential. But the 268h is a completely different story in a 390. I've been building Fe engines for 30 years and learned a few things . That 390 would be putting down 325-335 rwhp with a few very specific changes. Header primary size is very important and should be taken into consideration depending upon what factory Fe heads used . Factory head castings are definitely not all the same. Some very common FE heads can provide a significant amount of performance where others substantially inhibit power production on the same displacement size engine
Don't know if you're still around, but 30yrs building these fe engines has me wanting to ask you a question? I'm right now trying to decide what to change on my 360 fe converted to a 390 by way of just crank and rods, to get some more torque without going nuts. So, you're saying, Edelbrock Streetmaster intake manifold, 268h for the cam, guessing long tube headers and what for the ignition? Thanks for your time!!
I changed 68 Gt intake to quality aftermarket intake for 14hp gain, not worth the bux or the work. Best bux were on good long tube headers and front disk brakes. For big power gain install good super charger, carb and adequate fuel pump, minimal mileage impact. That HEI ignition with good coil should work but isolate plug wires as even MSD wires will arc at high load. Use tire dyno to set relief valve to avoid detonation. Need adequate transmission and traction bars. A super charged truck will probably end up a tree trunk ornament.@@Beemernow
Awesome truck, should make more with almost 400 inches
Nice truck. 390 sounds really good.
Beautiful truck man! The three on the tree makes it so rad!
I too had a 69 F100 with a tired 360. Unfortunately, most of those trucks came with 360's. Mine was a 3 speed automatic. What they all really need are a 4 speed with a strong 390. With all the work you have into that truck you have something more reliable, cooler, and cheaper than any of the newer ones thats for sure.
100!
I have a 68 F100 short box with a A scratch 428 PI with a set of 427 mid riser heads, Holley 800 cfm carb, Edelbrock Streetmaster intake, comp 268 H cam , comp timing set and adjustable rockers and Top loader close ratio 4 speed. & 3.90 gears with a Detroit locker. Truck really moves out. It's definitely a quick pickup. Really quick between gas station stops too
Man, love the progress. My old man had a 73 F250 with the 390 and 3 on the tree. I was telling him about your build and he said his was 10:1 when it was built as well. His truck would flat haul ass back in the day. He ended up selling the truck to a buddy who needed the motor. The mounts and underside were rotted and he couldn't drive it anymore. Always wish I had bought it myself just for the motor. When the friend put it in his 4x4, he couldn't believe the power it had.
They aren't hard to replace. Every one of the trucks I have from this era had rotted floor pans, cab mounts, and radiator supports when I got them. The 67-72s are particularly worse about the rad supports and cab mounts though.
The Engine Sounds great :) I Learned a long time ago, if you are aware of a problem, like a cracked fan shroud etc, Fix it Right away or it WILL BITE YOU IN THE BUTT :) Its called Murphys Law , Ask me How I Know :)
Your Very Talented in Mechanics and Welding for such a young Man, Keep up the great work, Chellie
hahah yeah should have done something else with that fan shroud... like you said, Murphy's law haha. Thanks!
My heart sank when I saw the stuff fly out from under her.
It is definitely looking up and that truck has a future now. A "ton of fun". I haven't heard back from you on that block so you think I am bird seeds. May not be many but that proves there are more, just keep having fun
I looked up that block.. it seems to just be a service replacement block. I couldn't find much demand for it anymore
@@330_garage3 l think what it comes down to is I am old school and the stuff on the market today comes in higher power forms than what we had to work with. So when thinking about the coyote engines are building four or more hundred horses and not a thin skirt old school engine. Only someone restoring the right engine code mid sixties car would need it. I just got old, sorry
Very cool channel. I love the truck. I've got a similar UA-cam channel dedicated to a 1981 C10 that has been 454 swapped that I work on. Just had it on the dyno yesterday after doing a hydraulic roller cam conversion top end kit from Edelbrock. I was nervous for you filming that close. My 1pc driveshaft let go at 5600rpm and dented my exhaust and put a hole in the floor. Be careful! Those old motors will make power but probably never spun that fast so make sure your drive line is designed to take it.
jeez that thing sounds MEAN! cool channel, glad it popped up on my feed.
That was a scary moment! Thank God it was simple.
hahahah my heart stopped for a second!... I imagined a piston came out the top of the block after all that work, luckily a pretty quick fix
I love it! very nice! now you just need a four on the floor which would make it even cooler.
Funny how it's almost dead on DOUBLE what you had before. It's still not where a 390 can be. I'd say the intake and heads would be the next area to look at.
Yeah, really woke it up. Yeah to really start seeing some better power out of that 390 the cost starts going up!
@@330_garage3 and it's really fine where it's at. That's good power people talking shit about the power to the tires. That's good power
Not too shabby.
WOW- sounds like a boss's truck!!!! My 2019 Ford Ranger is 270hp and 310lb ft torque.....your 3 on the tree looks more fun to drive tho.
Love your videos . Been watching for a while now. Just subscribed today. Awesome truck man and I'm so jealous of your shop. Must be nice to have the space and all the tools to do any job.
Do that 390 some justice and either work those cast iron heads or put a set of AFR or Edelbrock aluminum heads in it.
Afr don't make fe heads, trick flow does now
@@eddiefe428 Omfg! Ok Einstein!
Might not have a ton of power, but it sounds damn good.
The Metalhead Homestead typical ford junk
Good job. Nice little motor.My 410 made 462 hp and 425 tq at the rears.
What's the specs on your 410? I've got a mix of FE stuff on mine. It's a 410/428 1U crank in a 360/390 block 60 over. So it's 20 under a 428. Got the Crower crank, 390GT heads with Edelbrock intake, hooker headers. Never took it to a dyno.
@@karljay7473 Its a cleveland. You still want to know the specs?
@@Scubasteve22 Wow, just looked up some 400 Clevelands, those are impressive numbers. I don't need the specs, that's pretty impressive.
@@Scubasteve22 Wow, just looked up some 400 Clevelands, those are impressive numbers. I don't need the specs, that's pretty impressive.
@@karljay7473 The dyno guy, who also builds various engines said, it was well north of 600 hp on the flywheel. When we dynoed it, it only had about 1500 miles on it and was going thru the quarter at 5800 rpm. Now it hits the redline just as i cross, about 6200. So would put it around 625-650 hp.
Your well over 300 at the crank and that is not bad at all, your torque curve is great.
With that torque curve who needs more than 3 gears??
I guess if you want to cruise over 45 mph without it screaming
@@Terminxman all dependent on the rear end and tire size, you're going to get 1:1 even with a 4 speed.... overdrive could help, but there's always gearvendors. with that torque he can run 3:55's no problem
@@joestreiff9401 There are 4 speeds with overdrive, and 5 speeds.
@@Terminxman not that came out of a bumpside
Intake , and remember fords love timing . great job.
Bad ass truck
Swap that intake and gain some. The stock cast iron is restricting that cams potential.
Not to mention loose a lot of weight off of the nose of the truck. would get a good bit if not 300 hp to the wheels.
Lol and drop about a thousand pounds
Michael Quinn just put a chevy engine in the thing 390s are scrap iron like 98 percent of for engines
@@Wanous-hv7zo Thank God that truck didn't end up in your hands because you'd have it ruined or traded off for a gun. A 390 wasn't 98 percent of all ford engines, Mr. Science. There was also 302HO, Boss 302, Boss 351, 4V 351 Clevelands, 427 side-oilers, and 460 big blocks. More jealous now?
Tyler's Neighborhood Garage 302 was junk to low oil pressure bearing rattling junk
Getting 2and gear rubber in a column shift...what a feeling....if you could only bottle that up and sell it!
LOL!!! well in fairness... with that 1-tire-fire rear diff. and that torque monster 390, it wasn't super hard, but still a very impressive step up from where it started out as a 360.
I swapped mine to a flexalite E fan, needed to upgrade my alternator for a ford 3G unit but was worth it takes the parasitic drag off of the engine probaby freed up a few HP, give you room in front of your accessories too.
If you watch Engine Masters on youtube, they did a video on this. If I remember right, it was around a 20HP gain by going to and electric fan.
Sparks Fire and Baling Wire really? That's impressive! There has to be some cons though right?
@@yeboscrebo4451 if your doing heavy towing you might be better off with a mechanical fan but for putting around town with a 250ish HP engine it's likely fine just need to make sure the electrical is up to the fans.
@@yeboscrebo4451 Probably just the extra load on the electrical system. I plan on doing the upgrade on mine this spring.
That old girl sounds good. Looks like it pulls good too.
Maynard Reed ha ha ha ha ha ha ha ha ha all 200 hp pulls good ha ha ha ha ha
You could have thrown a bigger bumpstick (cam) in it since you are 10:1. Not sure if FE parts are easy to come by where you're at but there are some heads that tend to work better than those C8 units you have. Also... your fan blade is faced the wrong way! Flip it around.....lol Dennis Carpenter as well as a few other parts places have OE replacement fan shrouds. Think they are $130- $150? Still, not bad numbers, seems like its got plenty of get up and go and sounds damn good!
Hey thanks for the video,I have a 72 xlt sb,with 390 was 3 on the tree ,but they guy before me put in a 4 speed on the floor sounds mean but not fast,but I love it,keep up the great work
Three on the tree is damn cool.
130 HP @ the tire from a old 360 Fe is actually pretty damn impressive considering it only had a rating of 200 HP gross new. It the torque that really tells the tale with a 360 Fe. They weren't known for being fast but they pulled pretty much whatever you put behind them. It may have been slow going but they never had trouble going even though slow . Great reliable engine the 360 Fe was. Definitely known for giving decades of reliable service
I love the 390 FE . Easy to get lots of power out of them with just a few simple changes. Cam , carb & intake and headers and they really wake up. The stock exhaust manifolds are horrific
Nice job!
Awesome job on the motor
Jeesh that blow up had me worried for a second! Great progress! I'm taking a nice drive in the countryside vicariously through your video. What are you thinking as far as the exterior? Are you keeping the patina? How bout that bent up grill?
Yep! My goal was to keep the patina... I like the story it tells
I always liked a three on the tree.
Vintage Ford big blocks are just pure Americana. I love the sound of a warmed over 390.
If you convert that to flywheel hp, you are making 320 hp and 396 foot lbs of torque. That’s good for a truck 390. The truck engine had lower deck height than the car engines. The piston usually says 410 on the pin side. The piston is.100 lower than the car engine. They have good power. Congratulations!
Don't need to see, the sound was all I need. Neat truck, I like, I subbed,what's next?
hahaha next video will be a black screen with audio only then! Next video: Explorer 8.8 rear end swap with a mini c-notch.
I haven’t seen three on the since I learned to drive my fathers 72 Chevy Truck.
That is pretty good numbers for at the rear tires. At the crank it is more of a 310hp. And 420 ft lbs.
Heck yeah man, that’s not bad for an old truck…😃 Hurst makes a floor shifter for the 3.03 transmission if you’re interested. They work really well if they’re installed properly. Basically reverse would be over to the left and forward where first gear is normally and then first is to the left and back. Then just slam if straight forward for 2nd and straight back for 3rd… You’ll be able to shift that transmission quicker than you ever could with the column shifter. I’ve got the Mr. Gasket brand in my truck but I really want to switch over to the hurst shifter. In the future I’m gonna find a 5.0 out of an explorer and probably build a 347 with a Tremec 5 or 6 speed I haven’t decided yet. But a fuel injection swap is coming in the future. I don’t know anything about carburetors…😅
It hurts to see the 3 on the tree setups converted. There are so few of them left because everyone does that and there were already less to begin with than floor shifts. It's a fun setup and no one knows how to drive one. I've got a 69 f250 three on the tree 390 and I love it as is
@@buttonysquare8501tell about it….that and efi swaps from carb setup
Where can I get this hurst shifter and 4x4 shifter
Beautiful truck
Don't care for the patina but sound good and its solid
Good meat & potatoes vid, keep 'em coming.
My favorite part is 6:17 when he revved it up and threw it into park. 😏🤣😉
Dude, are you ever gonna make another video?? I'm getting impatient to see this truck again.
Sadly, the regular Joe aint got that garage, but slainte to you and your build!
A friend of mine had one of these f100's with a 390. Let me tell ya, none of the trucks today would have stood a chance against that bitch! It was so fast and had so much more power than what this test showed!
If you look at the torque numbers in this video, you can see why that 390 would push an F100 around so well. This truck would burn tires at will, with that 390 in there.
@@330_garage3 The old motors sound so much better than today's
BEAST!
Still not bad for a stock ish 390 , heads ,cam , and intake would make another 100 Hp if not more
The 360...is a 390 block and heads...it the crank that's has a short stroke crank in that brings it to a 360 but it a 390 block and heads
i have a 70 with a 68 grill that my dad bought nearly new with a 390 c-6 and i ended up putting in a 428 pi crank and giving it more stroke came out to a 418 cid but not sure it runs as good as yours , mine has a bit of rust in the cab.
I like your videos thanks ..keep them coming it gives me the encouragement to do more to my camper special ...I'm surprised at the numbers I have a 390 in my 69 and the book says with the factory 2bbl either autolite or motor craft it has 265 base HP at 4,500rpm . With the Holly 4bbl you added I'm assuming it's a600cfm I thought it would break 300HP ...I ran the big 500CFM 2bbl for awile now I'm using the 350cfm 2bbl I do know there is a difference in the heads from a truck vs a 390 Ford Fairlane or mustang .
I wonder if the truck heads are restricting that 4bbl flow
I believe those published HP numbers were at the flywheel. Keep in mind it made 270hp at the tires, through that 3 spd. trans and some tall rear end gears. They say to figure 20% loss through the drivetrain, so with that estimate we would have seen 325hp on an engine dyno. For an old FE motor with headers and a Holley 670cfm I think its probably on par. People have speculated that the cast iron intake is holding it back, and some aftermarket heads would help it a lot. I just wanted to see what you could do with stock parts.
Rewatched your vid from a year ago ...also some have said that the factory cast 4bbl intake wouldn't go over 5k rpm but you did with factory heads and intake on the dyno .
I bought a boat anchor 4bbl on offer up boiled out and cleaned for 50 bucks .I thought about spending the cash for a edelbrock but with stock heads I doubt other than wieght savings it will give a big noticable difference unless it was a RPM intake ,
Doubling the power is damn good!
SO whats the total cost to rebuild this engine?
hey dude, i just bought a pretty sweet 390 powered 1976 truck similar to yours.
so what were the power adders you added?
just headers, 4 BBL and intake?
OR did you up the compresion somehow?
my friend had a built 390 and 3 speed and had to reach thru the floor to shift cause his column was worn out
hahahaha, they aren't the smoothest things so shift
A 351C 2V be a great build in an F-100.
That was pretty cool. I would have bet money that motor would have made more like 350+ hp.
not on stock heads.
I freaked for a bit when I saw the blow up.
Was hoping to see 300 hp out of it. You're going to have to change your intake and get at least a 750 on there. Honestly, set up correctly that 390 should give you close to 400 horse on pump gas.
Yeah I was hoping to clear 300 at the tire... guess that's a pretty steep goal through the original drivetrain
330_Garage 400 will never happen out of that junk 390 turd
@@Wanous-hv7zo how many crap comments you gotta leave on this video? We get it, you dont like Fords. Then why the heck are you watching this channel? And 390 Fords are NOT turds. Those things will run on sand. Quit being a troll
L76 6.0 VortecMax they are turds. You don’t know shit about engines
L76 6.0 VortecMax you better go buy a junk ford with a turd 390 in it then
I've got a 67 galaxie with the 390. there is so much more potential in there. hell a power plus package from edlebrock is rated at 420 hp.
Yep exactly. I had a 66 XL with the 352. And my dad had a 67XL with the 390.
Let me know if you want a custom gauge plate for where the radio should be. That's where I have my auxiliary gauges mounted.
Eric Heimbach so you can see your oil pressure at 5 pounds and the bearings rattling
@@Wanous-hv7zo Pretty much... more so to fill the giant hole in the dash since I dont want to spend the time or money to install a radio.
That looks like Saginaw, Tx.
New Hope TX... but close!
Don't worry about what the UA-cam powertrain engineers say. This is TV for them...they don't know what the hell is going on. A nice 5 or 6 speed and a steeper rear gear will make that a lot more fun to drive at some point ;-)
Lol! UA-cam powertrain engineers! All the expertise is pretty entertaining to read through. Thanks - best comment yet!
Tyler's Neighborhood Garage yea ok probably been wrenching way longer than you
330_Garage i can get more power out of a 283 chevy engine hell a a 3.8 supercharged has more power sad
@@Wanous-hv7zo We aren't going to engage you in one of these online pissy pots. Give it up.
Tyler's Neighborhood Garage give what up? I know what i am talking about pee wee
Awesome videos man and thanks for the info. hey are those 15' wheels with a 5 - 5.5 bolt pattern?
I watched every single video on your channel and you convinced me to buy an f100 lol it's a 76 so not much of a difference in style
great! you have the disease now!
That's not bad considering those numbers are referring to power to the wheels, there is a lot of parasitic drag to consider
That what I have in my truck is a 390 people try to buy just for the engine
What gears are in the rear end, and are they original to the truck? Also, what is ball park price you spent on parts and labor for that 390?
Talking AFR, 11.2 seems a bit on the rich side for n/a, I bet you could lean it out a point
nice video man
Why did you buy a 390 short block?? The 360 and 390 is the same except for stroke. Should've just cleaned up the 360 and got a 428 crank. Or 428 crank in the 390 which makes it a 410. But.. guessing cost lots more to find 428 internals
For an old wore out 360 130 hp at the tires really isn't that bad.
Time for a c6 and a high stall
390 cid ? not quite 1hp per cu in . dang man . unlock the potential
If your gona replace a 360 crank why not go to the 427 crank and cam giving you a 410 stroker.
because a 427 crank is $$$ and hard to find. I was also wanting to test this "cheap combo" that is talked about in the ford forums, as though it will make 500hp for 200 bucks
@@330_garage3 450$ through summit or jegs for the crank. Hey you do you just saying if your gona put that much in it that little more would have gotten you way faster.
You meant 428 crank. 427 crank is same stroke as a 390 crank.
Cost.
Been catching up on the videos. I own a 68 f100 360, engine is about prime for a rebuild. I hve the column shift 3 speed as well and want to keep it. Wondering how the toploader 3 speed held up after the build? Too much toruque for it?
you should have more subs!
What did you do with the old 390 after the ls swap ?
Wow😁
Nice work. You might tick off one of the Ford guys by putting that" foreign " dist.
That's me. Ugly.
330_garage what brake booster and master cylinder are you running now that you got disck brake all around thanks in advance
The fan is on backwards
I'm wondering how you measured the compression ratio. Most cast pistons have a dish and eyebrows and are closer to 7:1 and that could explain the low power outcome. (Seems like it should be higher.In order to get a measured 10.5 to 1 out of mine, I had to use forged pistons to get a true flat top (one set of eye brows, no dish) and mill the head (That's with low riser heads, also I'm using a 428 crank) (I couldn't find a cast, true flat top piston)
I calculated it. I walk through what I found in another video. By using the old ford 360 4V pistons, with the 390 crank and rods, it will bring the compression up. You're right though, in today's market trying to find a cast piston to get you into the 10:1 range is hard to do. Here's the video where I walked through the calculations
ua-cam.com/video/wJIHv-8jZD0/v-deo.html
ok got motor out of car heads off how do i tell if its 390 or 352 or 360