I was wondering ( cant find it in searchers) what kind of hp gains can i get out of boring a 350tpi 0.30

 

You'll gain 5 cubic inches. Assuming 1 hp per cubic inch, you'll gain 5 HP. About 1.5%.

You don't bore an engine to get more power, you bore an engine to clean up worn cylinder walls for a fresh sealing surface for the piston rings.

 

To my understanding .30 would give you a 355. I dont think you would even notice any hp difference.

But you can stroke that 350 to a 383 and gain alot of torque and hp.

but you would have to verify this with the rest of the guys on the board. Im just new to all of this.

 

Actually, .030" over with a stock 3.48" stroke would give you approximately 355 cid.

 

While it's true that the act of boring the cylinders oversize yields negligible gains in power output, proper selection of new pistons can make the investment worthwhile.

For example if the old engine was built with low-compression dished pistons, and you go with flat-tops that increase the compression significantly, you'll be able to make more power per unit volume fuel combusted.

Combine this improvement with upgraded heads having more modern chamber and port designs, an appropriate cam, and properly balanced induction/exhaust systems and you see more return on your investment.

 

That's the general benefit of a rebuild whether accompanied by boring or not, as opposed to the benefit of boring alone.

 

I agree, but I'm careful to point out the better components.

A low-buck "rebuild" leaves nothing but what you had before, except it doesn't leak/burn oil.

 

Worse yet, a low-buck rebuild can actually leave you with less horsepower.