flynbludream

iTrader: (1)

Gents,

Contemplating options on getting my high school truck rolling again. It's a pro streeted 55 chevy. I have always wanted to drop a 427 in it. I'm wanting to turbo it as well. Want at least 750whp with the option to go 1K.

I tried searching, but couldn't find what the best setup would be for the engine build. Thoughts on more stroke vs more bore? Might do an iron block as the truck weighs a ton already.

What are the benefits of doing different displacements/bore-stroke combos?

TIA

TXMaro

iTrader: (13)

Undersquare. The smaller bore will give you more cylinder wall strength and lighter rotating mass.

AES Racing

iTrader: (6)

You shouldn't need 427 to make 750rwhp, i'm sure 370 or 390ci can do it

If you did, i'd go with 4.125 bore x 4.000" stroke, You will end up with a stronger piston.

TXMaro

iTrader: (13)

Our 427 uses a 4.065 Diamond piston and takes a 400 shot no problem.

flynbludream

iTrader: (1)

What exactly does "stronger piston" mean?

I understand that the smaller piston will give you less rotating mass, however the longer stroke will increase your piston speed correct? This is also not great for high RPMs. Not that im planning to spin this thing to the moon either.

I guess what I'm looking for is what combo of bore x stroke is most reliable? Or what is preferred? Does it really even matter much?

AES Racing

iTrader: (6)

The larger bore size will unshroud the valves, fill the cylinders better, more airflow.

Cup engines are 4.155" bore x 3.3" stroke

Those engines teams are looking down to the 1/10 th. of a horsepower gain from every element. Cup engines rule is 358 ci, no rule on crankshaft size yet they use 3.3" stroke.

Heres what a "strong" piston looks like, 1.270" CH

you can't fit that dimension piston into a 1.050" compression height

JBarron

Wow, that crown must be quite thick.

3.8redbird

iTrader: (3)

If you go 4.125 bore you can also run MUCH better heads. Bigger valves the works.

98Z28CobraKiller

iTrader: (17)

I would keep the stroke under 4".

charlie_gonzales

iTrader: (12)

So best would be 4.125 bore X 4.000 stroke?

That way you can run better heads, bigger valves

Also stated that the larger bore will unshroud the values, fill the cylinders better, as well as allow more airflow?

What about the rotating mass...how is it with this setup...compared to others...

Any other examples...compared to this one...

charlie_gonzales

iTrader: (12)

Sounds like a killer setup...no lag...

Lonnies Performance

iTrader: (16)

Big bore, short stroke will result in the most durable engine with respect to the bottom end.

Cylinder wall thickness should not be sacrificed to gain the last few cubes. 4.125 bore is not excessive with the proper block. Always stay within the recommended max bore size.

For 750hp, you do not need anything excessive & can do this with a well built engine on low boost.