airforcefun

does a person have to bore out the motor for a 383 stroker or will the stock bore be good enough?

thank you

CFI-EFI

The common 383 is a 350 block bored .030" over with a 3.75" stroke, a derivative of a 400 crank shaft. 4.030" bore X 3.75" stroke = 383 inches³. There is no reason to waste money boring a perfectly good block, "just because". You will have to do your own math but the 4.00" bore with a 3.75" stroke ought produce around 377 - 378 inches³. If you are really on a budget and clever, you can save buying pistons too.

RACE ON!!!

JLeatherman

My car is running a 377 (stock bore with a 383 crank). When we tore it down the bores were good enough to be honed to stock-size Hyper pistons. They run less clearance than stock, so even though my stock pistons had lost compression the hypers were over just enough that I had to hone but not re-bore.

93Quasar

As noted, stock bore is just fine, but you will have to bore if you want a "383". Without the bore it will be a "377". You'll still have to look at clearancing the block though, so you'll likely be at the machine shop with it anyway. If you are dead set on stock bore, you could look at a crank typically used for a 396 (3.875 stroke) and make a "390".

CFI-EFI

Or you could cheat and do it the way Chevy did, with a 4.00" bore and a 3.80" stroke.

RACE ON!!!

airforcefun

thanks guys. that did help. i do plan on buying an all forged internal stroker kit, so i can hopefully add some nitrous or Fi down the road. But a good friend of mine told me to just do a 383 stroker for now. The friend is a graduate from UM in mechanical engineering, so i decided to follow what he said.

thanks

lenbal

HI
I read about this a lot and do some math - all you have to add to make it happen you might consider a crate engine - your choice and budget