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Old 07-26-2008, 02:57 PM
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longest stroke engine?

which small block has the longest stroke among GM?

chevy,pontiac,buick or olds?

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Old 07-26-2008, 04:07 PM
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Err well, Chevy had the only "small block", the other three used the same basic architecture for everything from 350's to 455's.

The 400 small block chevy had a 3.75" stroke.




Larry
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Old 07-26-2008, 04:36 PM
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thanks for the post larry.

but i operate on 350 engine usually.cause its parts are common in my country , i dont live in usa.

i would like to know all 350 engines(pontiac,olds,buick...) are the same and have same dimensions like diameter,stroke,deck clearence...

chevrolet engine info is easy to find on internet but the others not.where can i get these buick,olds,pontiac infos?
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Old 07-26-2008, 05:19 PM
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engines

here is a good place to start. www.projectpontiac.com There should be other sites like this.
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Old 07-26-2008, 07:10 PM
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GM 350 demensions:
Buick 3.80" bore X 3.85" stroke
Chevrolet 4.00" bore X 3.48" stroke
Oldsmobile 4.057" bore X 3.385" stroke
Pontiac 3.875" bore X 3.75" stroke
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Old 07-26-2008, 08:59 PM
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Quote:
Originally Posted by daturkishulan
thanks for the post larry.

but i operate on 350 engine usually.cause its parts are common in my country , i dont live in usa.

i would like to know all 350 engines(pontiac,olds,buick...) are the same and have same dimensions like diameter,stroke,deck clearence...
Not even close. All have completely different bore, stroke, and everything else. The only parts in common are the distributor cap and the carb gasket.

And while the block architecture is similar, Olds fans DO refer to the big block and small block Olds. The primary external difference is the deck height, though the internal parts (crank journal diameters, rod lengths) are also different.
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Old 07-27-2008, 05:54 AM
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Quote:
Originally Posted by WDCreech
GM 350 demensions:
Buick 3.80" bore X 3.85" stroke
Chevrolet 4.00" bore X 3.48" stroke
Oldsmobile 4.057" bore X 3.385" stroke
Pontiac 3.875" bore X 3.75" stroke

what about caddy?

and where can i get these complete gm engine dimension infos?
cause i ll try to combine different gm engine parts if they fit...
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Old 07-27-2008, 06:04 AM
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thanks joe_padavano, WDCreech, charley1.

i ll probably use 350 buick block.cause i need long stroke.

and i plan to use a crankshaft with stroke over 4.00".

stock 350 buick crankshaft is 3.85" maybe 400buick crankshaft is over 4.00".
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Old 07-27-2008, 07:13 AM
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Quote:
Originally Posted by daturkishulan
what about caddy?

and where can i get these complete gm engine dimension infos?
cause i ll try to combine different gm engine parts if they fit...
They don't.

Again, the block, crank, and bore spacing is completely different on each of these motors. In the 60s and 70s, each GM division had their own unique engine designs. You might as well try combining parts from Ford or Chrysler motors. Some folks have swapped rods and pistons, but this invariably requires lots of custom machining.
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Old 07-30-2008, 02:46 PM
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Quote:
Originally Posted by joe_padavano
They don't.

Again, the block, crank, and bore spacing is completely different on each of these motors. In the 60s and 70s, each GM division had their own unique engine designs. You might as well try combining parts from Ford or Chrysler motors. Some folks have swapped rods and pistons, but this invariably requires lots of custom machining.

custom machining is not a problem for me cause im already cnc lathe operator.

i plan to use 350 buick block but im still undecided which crankshaft i would use? i need torque so i need long stroke crankshaft.that 350 buick block is suitable for long stroke but i cant find that damn long crankshaft

please help guys!
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Old 07-30-2008, 02:54 PM
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You aren't going to be using a chevy crank in a buick block or vice versa or any other combinations

The blocks are different length, width, height, and depth. The crankshaft is different lengths and the throws are in different position to compensate.

There is no "mixing and matching" order a Dart 400 block with a 4.000 or larger crankshaft.

There is no reason to be messing around with caddy or buick parts when chevy stuff is readily available even in Turkey.
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Old 07-30-2008, 03:19 PM
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Quote:
Originally Posted by Double_v23
You aren't going to be using a chevy crank in a buick block or vice versa or any other combinations

The blocks are different length, width, height, and depth. The crankshaft is different lengths and the throws are in different position to compensate.

There is no "mixing and matching" order a Dart 400 block with a 4.000 or larger crankshaft.

There is no reason to be messing around with caddy or buick parts when chevy stuff is readily available even in Turkey.

thanks bro.

yu are right.the all chevy parts is available even in moon

but i sold my buick lesabre last week.the new owner of buick is ignorant about mechanics and especially american cars.here in turkey after 70s petrolium crisis is hard to see gasoline monster american cars.

anyway i promised to help him out about mechanics.and i wanna build a torque monster.according to friendly hotrodders forum users the buick engine is the one of the block which has longest stroke.so i can use that lesabre 350 block.and now i need a long crankshft.the stock 350 buick crank is 3.85" but maybe i can use 400 buick crankshaft.i have no idea about its dimensions maybe its over 4.00".

bytheway thank for recommendation Double_v23.its too expensive to order a new custom engine for me.
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Old 07-30-2008, 03:30 PM
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Here's some Buick specs along with most other engines if you look at the top of page. The Buick SB350 & BB400 are totally different & the cranks don't interchange. The 400 crank only has .050" more stroke anyway.
http://users.erols.com/srweiss/tablersn.htm#Buick

Last edited by SSedan64; 07-30-2008 at 03:31 PM. Reason: Forgot Link
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Old 07-30-2008, 03:50 PM
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Quote:
Originally Posted by SSedan64
Here's some Buick specs along with most other engines if you look at the top of page. The Buick SB350 & BB400 are totally different & the cranks don't interchange. The 400 crank only has .050" more stroke anyway.
http://users.erols.com/srweiss/tablersn.htm#Buick

thanks ssedan64.you are such a good friend
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Old 07-30-2008, 03:59 PM
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The Buicks are the oddball of the GM family. Sort of like Fords, not much interchangeability. Ford has 5 or 6 different V8 platforms. If you look at the different engine charts, the Chevy, Pontiac, Oldsmobile & even Cadillac offer much more interchange options because the bore spacing & deck height is the same on many more engines.
http://users.erols.com/srweiss/tablersn.htm
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