[Swishedb]

Hi, I have a 383 all bore engine and want to know whether adding an aftermarket crank to give it a longer stroke would achieve more hp/trq?

Thank you.

 

[MW69Chevelle]

I’m sorry, but I don’t understand what “all bore engine” is. GM didn’t offer a factory 383 engine, 383 is achieved by adding stroke to a 350 from 3.48 to 3.75 stroke.

 

[Swishedb]

It means the cylinders were bored 30 over and the crank remains stock. So the displacement is now 383.

A typical 383 stroker would retain the 350 cylinder size but have an aftermarket crank.

My question is whether doing both, since my cylinders are already bored, would increased performance if I obtained the aftermarket crank.

 

[VinceS427bb]

you could go to the next size bigger crank stroke that fits in a stock 350-block
3.875'' can give you 396 cubes and more power & torque, check the link for info.

396ci Small-Block - Chevrolet Hi-Perf. Magazine

Chevy stroker motors have been with us since almost day one but are hardly what you would call common. The advent, back in the ’80s, of cheap 400 cranks with re

www.superchevy.com

 

[GLHS60]

Keep in mind changing the crankshaft stroke will also require new pistons.

Thanks
Randy

 

[Busted Knuckles]

It means the cylinders were bored 30 over and the crank remains stock. So the displacement is now 383.

A typical 383 stroker would retain the 350 cylinder size but have an aftermarket crank.

My question is whether doing both, since my cylinders are already bored, would increased performance if I obtained the aftermarket crank.

You need to go back to engine building school.
A 350 with stock crank and .030 overbore is 355, not 383.
A 350 with 3.75" crank and .030 overbore is 383.
And yes, you'll pick up power with a longer stroke crank since you'll have more displacement.

 

[GuysMonteSS]

X 2 what Gary said ^^^
Guy

 

[71454Chevelle]

It means the cylinders were bored 30 over and the crank remains stock. So the displacement is now 383.

A typical 383 stroker would retain the 350 cylinder size but have an aftermarket crank.

My question is whether doing both, since my cylinders are already bored, would increased performance if I obtained the aftermarket crank.

If you have a stock 350 crankshaft (3.48 inch stroke), and the block has been over bored 0.030", you have a 355 not a 383.

 

[japete92]

Kinda feel like I'm piling on but; a 383 is approx 48 cu in per cylinder (8 x 48 =384; close enough). It would require a cylinder diameter of approx 4.2", with the 3.48" stroke, to reach 48 cu in.

And yes adding stroke to the approx 3.75" of the 383 will produce more low end torque.