Oldsmobile Engines. Blocks, Windowed Main Webbing
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- Опубліковано 17 лип 2024
- Oldsmobile Engines. Blocks, Windowed Main Webbing. This video shows an example of how oldsmobile redesigned their engine blocks in 1977. The engines effected consists of the 260, 307, 350, and 403. These are considered "new light weight castings". All blocks from 1977-1990 Are cast this way. Tho these are considered undesirable blocks and I personally wouldn't go out of my way to build one, this doesn't mean that your engine is no good. Hope you enjoy the video and find it informative. Also this excludes the oldsmobile 350 diesel DX blocks. They are a whole different casting designed with overkill to withstand the eminence stress of compression that a diesel requires.
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From what I heard about when domains is that it's supposed to flow oil and lubrication more easily through the chambers of the bottom end
You could get the olds 455 in the gmc motor home up until 1978.
They must have been using left over motors because they stopped making them after 76, i have seen those motor homes with olds 403s tho
@@UsefulEntertainment they always make engine a couple of years longer after the stop using them in cars to cover warranties.
I just put one in an '87 Cutlass - 4 door. My gawd is this thing fun to drive !
Does it burn out have u dino Ed it want to put it in a 84
Thx for sherring your knogles on the 403 olds , i have on in my grand prix 79 engin is from a trans am. 1980
i live in denmark and help in hard to find if you dont drive ford ore chevy... happy new year to you to.
They did it to lighten the block.
All the manufacturers did what they could to lighten everything they could in the mid to late 70's. Pontiac lightened their V8 castings on the 350 and 400's from 74/75 up to the end in 79. As far as how durable the 403 block is? I wouldn't worry about them at all. You would have a lot more to worry about then the block breaking like a piston breaking or a bearing failing. And even though the main webbing is pretty light weight you should see the main webbing on a Gen 1 Hemi like the old 392. They are very light too, although no "lightening windows" but still very light. They supercharged them and ran them on nitrous for years pushing them to well over 1500 horsepower. If you're building a 400 to 550hp street engine you will never come close to breaking the block. If you want a 750hp or hotter engine you probably aren't going to start with a 403 anyway, you'd be more likely to start with a 455.
All good points.
@@UsefulEntertainment I'm an owner of a 1979 Trans Am with the stock 403. Do you know which 455 would be proper to replace the original engine, and what it would take to do so? I am not interested in an LS swap, I am more interested in keeping the car as original as possible while at the same time making it as fast as it looks. If that makes sense.
Is there an aftermarket 455 which can basically be a "plug and play" with the existing engine bay, electronics, transmission, etc?
Has anyone bosted this block and can tell results I have one I was gunna nos it to death n see what happens
they claim that there are some 403’s with solid mains but what about the 350’s after 77? has anyone ever seen or heard of one?
I think they are just claims, because nobody ever has any pictures of one.
@@UsefulEntertainment i have a 350 with the derivative on the timing shelf that reads 554964-3A and nobody claims to have seen another one with that matching number, i don’t know if i have windowed or solid mains. It’s a 77 block
I'm an owner of a 1979 Trans Am with the stock 403. Do you know which 455 would be proper to replace the original engine, and what it would take to do so? I am not interested in an LS swap, I am more interested in keeping the car as original as possible while at the same time making it as fast as it looks. If that makes sense.
Is there an aftermarket 455 which can basically be a "plug and play" with the existing engine bay, electronics, wiring, transmission, and to still have the shaker work? Because the shaker is very important.
Thanks in advance, david
whats up david, you come to the right place.
all 68-1990 olds v8s are identical externally from the 260 all the way up to the 455, the big blocks have a taller deck height (400, 425, and 455s) but that doesnt effect much, all wiring, plugs, sensors, starters etc all bolt in the same exact place. swapping a 403 to a 455 is almost as simple as pulling the 403 out and putting the 403 right back in, if you want to keep the ac, you will have to shim the compressor, same goes for the alternator. i have a video of me swapping my station wagon from an olds 307 to an olds 455 you can watch, it pretty much shows you everything you need to know.
also note that big blocks use their own exhaust manifolds / headers
this is the exact swap you are looking to do
ua-cam.com/video/xtVpBm36RcI/v-deo.html&ab_channel=UsefulEntertainment
Hmm! Wonder Why they did that! That's Great info on the 350 Bro: I've still got that 70 or 71 350 in the back of my mind ( Im not Exactly sure what year that motor is but i know its a pretty early motor because of the 4 spoke fan... ) That webbing surely didn't hurt its street driving performance for sure: maybe its the motors secret! Hey thats Cool Bro: Im glad you could get the cool mags! Awesome Stuff! Reminds me to keep my eyes opened for any old books too! ( Yep that'll be Awesome if you do make videos of them!!! ) Yep Those were some Great words from John, Hahahaha. I could tell it was cold up there... Im outside and sitting in the truck typing this comment and its 35 degrees. Luckily the sun just started peeking a little... Hahahaha, Thanks for the info, I learn something New every video, Cool! Merry Christmas and a Happy New Year to You and Yours. Hahaha, Later Bro!
I've known about this for years but never seen what they look like. I have a 76 350 smw, and my spare is a 77 in a Cadillac Seville so it's a windowed main. With efi on it.
Ya I'm told that they made 1000-1800 (can't remember the exact number) solid web 403 Oldsmobiles. Think they came in Buick wagons and Trans-am with the towing package. Good luck with that one. The 403 Olds is none the less a fun engine bolt on good heads, stab in a bigger cam target peak power for 5500 RPM Ballance it use good main studs and enjoy a quick revving powerplant
Yea I dont buy that myth about the solid main web 403 that dont exist.No one even has a picture that exist of a solid main web 403 😆 in my 43 years.
I'm surprised that you didn't mention the godfather of oldsmobile performance and racing engines. If you can find any of his published works you'll find out some very great tricks to keep the oldsmobile engines alive for any type of racing and street application. Especially the oiling system. They are all great reads. Ever heard of Joe Mondello racing. AKA. Dr. Oldmobile. The godfather of oldsmobile. The oldsmobile guru. Do some research. You might learn something. RIP. Dr. Joe Mondello. The oldsmobile god
Dr. Oldmobile
Is the 403 Olds a bored-out 350 Olds?
Nope, they use different parts and the cylinders are so big that antifreeze cannot pass between them in the water jackets.
@@UsefulEntertainment Thanks. Why not? I watched the video over and over and can't get my head around the concept of windowed mains. Is it a coolant issue? Is the engine fragile because it's missing metal in some parts? Thanks, david
There are non windowed 403 blocks...I've seen 2
I've heard about them
I'd like to see one to be a believer. Love to build one.
They came in trans ams with the tow package
Good info! But the girdle should beef up the block enough to handle most street mods!
I’ve got a ‘77 350. What’s the most horsepower I can make out of it? I also have #5 heads. Could I bore it out .30 and use those heads?
You can go 30 over on a 77, with those heads. I wouldn't be running nitrous or boost tho.
Merry Christmas Tyler....
Do you have any knowledge on the 307 head cc sizes vs the pre 71 350 Olds heads. I maybe able to get my hands on a 83 Hurst Olds with the 307, I'm looking to go up on the compression ratio on it with the cam.
w41duvernay here's the thing the 68-72 heads are all the same except the 71-72 have hardened valve seats for the exhaust. What they did to lower compression in 71-72 is they ran a 22cc dish in the pistons like all 68-72 2bbl engines were equipped with however all 68-70 4bbl engines had only a 6cc dish. I believe the cc on the heads are 64cc but people say they're more like 68cc. As for using 350 heads on a 307 the valves might hit the block and also I can't remember the head cc for the 307s but they have just as small a combustion chamber as an early 350 if not smaller. Watch my different types of olds 307s video and my olds high vs low compression piston video, they should help.
w41duvernay also if it helps #5 heads are 68-69 #6 1970 #7 1971 #7a 1972.
Not the brightest thing Oldsmobile ever did. They could be built up reasonably strong but the windowed mains would ad flex to the assemblies, leading to durability faults. Day to day driving would be fine! Weight savings and cost savings were the main reasons for this direction.
Ive heard of the weight savings but how much couldve it really saved, 2 pounds??? but yeah man under normal conditions its just fine.
Now I know what's inside my block am I 307 I never knew that and yes I started on my build for my 455 big block Buick I'm trying to find a donor car a Buick Regal
Save money on castings.
Or a diesel block would b the best one to build
To lighten the weight of the block, making them weaker, the older blocks are stronger bore metal. Olds blocks are the same just bore and stroke different, a 403 is a bored out 400
soulfultenor I've heard that too that it saves weight but honestly... how much are they going to save, almost a pound, if that? Why even bother if they wanted to save that wee bit of weight, why not do it some where else.
I'm sorry sir but the block of an olds 400 a big block the block of an Olds 403 is a small block with Siamese bores they are totally different the 400 has over an inch taller deck height
@@jhull7490 you are rite. Stupid people on here
a 403 is a small block like 307 or 350. The biggest small block. It's like the 400 in the MOPAR family that way, called a "low block" in MOPAR parlance.