355 Stroker Questions PLZ HELP

[emmittman]

Ok guys first post here so lets see how it goes. Just recently purchased a '67 Camaro with a 355 stroker motor with 12:1 comp. Basically i just want to understand the term "stroker" and I know 12:1 is way to much comp to hold any kind of Forced Induction but what about nitrous? ALso would a simple piston swap for something with a substantially lower Comp ratio, could it hold boost then? Any other things I can do to get more power out of it? IT seems to have a the whole nine yards. Also I have heard of Weiland but could someone tell me who Weiand is>? That is the stamp on the intake manifold. Basically, the car is awesome but i want more power and would like to go down the F.I. road. anything i can do with this motor to make it worthy or would i be better off selling it and starting fresh. PLEASE, leave as much detail as you can. THANKS TO EVERYONE. hopefully my experience here will be as good as all the times I have used Honda-tech.com for my Rice Burner passion! If i didnt explain anything right lemme know and i will do what i can to fix. I WANT A BLOWER!!!!!!

[Morley]

Firstly a 355 isn't a stroker. A 355 is just a 350 bored .030" over with the stock 3.48" stroke. Not only is 12:1 compression not good for forced induction, it ain't good for pump gas either.
Just swapping pistons may or may not lower your compression, it will also depend on the cc size of the combustion chambers of the heads and weather the block was decked (cut down for higher compression).
For forced induction you want a max of 10:1 (depending on how much boost) and you want to have a forged crank, pistons and rods or else you'll become an unauthorized chevy engine parts distributor with high boost. Using N02 would be out unless you had forged internals too.
If you were to run 9:1-9.5:1 you could probably get along good with 10-12 lbs of boost.
Another option is to chuck the small block and get a rat motor...427 big block. That will put some serious twist to your driveshaft.

Wieand is just a manufacturer of intakes and other engine parts.

[emmittman]

How is a 355 not a stroker when they (parts companies) sell stroker rebuild kits for your 350?

Originally Posted by Morley

Firstly a 355 isn't a stroker. A 355 is just a 350 bored .030" over with the stock 3.48" stroke. Not only is 12:1 compression not good for forced induction, it ain't good for pump gas either.
Just swapping pistons may or may not lower your compression, it will also depend on the cc size of the combustion chambers of the heads and weather the block was decked (cut down for higher compression).
For forced induction you want a max of 10:1 (depending on how much boost) and you want to have a forged crank, pistons and rods or else you'll become an unauthorized chevy engine parts distributor with high boost. Using N02 would be out unless you had forged internals too.
If you were to run 9:1-9.5:1 you could probably get along good with 10-12 lbs of boost.
Another option is to chuck the small block and get a rat motor...427 big block. That will put some serious twist to your driveshaft.

Wieand is just a manufacturer of intakes and other engine parts.

[wrightz28]

Originally Posted by emmittman

How is a 355 not a stroker when they (parts companies) sell stroker rebuild kits for your 350?

That's ussually a 383 kit.

[Genopsyde]

yea, stroking is achieved when you put a longer stroke crankshaft in. 355 is obtained by just an overbore of the cylinders.

You may be able to get away with dropping the compression by swapping pistons, but you'll first have to remove the heads and get them CC checked and also get the piston to deck clearance number. Then from there the math can be done to select the appropriate piston/head gasket combination you need for the compression ratio you're looking for.

[ikeyballz]

maybe its a stroked 327?

anyway, if the block was originally a 350, if you only have 355 cubes that cant be a stroker..

stroking will increase your displacement significantly more than a 5ci..

[GreyGoose006]

Originally Posted by ikeyballz

maybe its a stroked 327?

anyway, if the block was originally a 350, if you only have 355 cubes that cant be a stroker..

stroking will increase your displacement significantly more than a 5ci..

lol, i was about to say that...
problem is, a 327 is officially a destroked 350...
we seem to have an endless circle here.

as for your question, lower compression, put in forged internals, and you can run some moderate boost.

howerver, a stroker kit will give you MUCH more power and drivability for about the same cost.
you see, torque is a function of stroke length, so by increasing stroke, you guarantee more torque.
power is a function of torque, so with more torque, you get more power.

[ikeyballz]

hahaha. its a bored over 327 with a 350 stroke so now its a stroker eh? sounds good to me..

[89Firebird2.8]

And a 327 is really a stroked 289, so it all fits! :P

[MrPbody]

Huh??? 289? How did a Ford or Stude get in the mix? Perhaps you meant 283, but that's not accurate, either. 327 has a bore of 4" and a stroke of 3.25". 283 is 3.875" x 3". It was common practice in the '60s to DESTROKE a 327 by installing the 283 crankshaft, making it a "301" (actually same bore and stroke as 302, a large journal production engine, Z/28 ONLY).

From a fundemental point of view, it could be construed that 350 is a "stroked" 327, but not really. 350 (4" bore, 3.48" stroke) is a production engine, therefore, as standard, it's not a "stroker". One COULD grind the mains down on a 350 crank to fit in a small journal 327 block, making THAT a "stroker" (seen it done for mid-'60s Corvettes). The large journal 327s were released to use up the leftover pistons when 350 became the primary small block. They use the same crankshaft as 307 (nodular iron, "001" casting). There were a small number of large journal engines in '68 Corvettes, still at "327", that had a forged steel crankshaft (VERY rare).

FWIW

Jim

[89IROC&RS]

Originally Posted by MrPbody

It was common practice in the '60s to DESTROKE a 327 by installing the 283 crankshaft, making it a "301" (actually same bore and stroke as 302, a large journal production engine, Z/28 ONLY).

F

ahhhhhh my fav engine of all time, im building one for my IROC as we speak, but out of a post 87 1 piece rear seal, hydrolic roller cam block. got the L99 crank, rods, and pistons already

[89IROC&RS]

Originally Posted by Morley

...you want to have a forged crank, pistons and rods or else you'll become an unauthorized chevy engine parts distributor with high boost.

very nicely put