martiw

Hi,
I live in Puerto Rico small block are hard to find not to mention big blocks. I found a 350, These are the block numbers 395558 and heads are #8 with a four barrel intake. I know the heads aren't the best but can they be upgraded for some performance what modification do? to used these #8 Heads and mild cam

RocketKid70

From what I am seeing posted on the forums, these heads are a low compression "smog" head. You may want to try and look around to see if you can find something a little older, such as a set from a 330, or from an early 350. I am, by no means, an expert on the Olds motor, and only passing on what I am seeing posted.

oldcutlass

Welcome to the site, post some pictures of your car when you get a chance.

Octania

PR is practically part of the USA
pretty sure we can easily send heads there.

8's on a 395558 casting 350 can be a fine motor if you do not need super high compression. What octane gas can you get/ afford?

W31 flat pistons and 040 gaskets and #8 heads would probably get around 9:1 compression but I have not run the math....

martiw

This Cutlass is a 1966 with 1967 front end. Got it from father. We get here 87 to 93 octane at pump. Do big block heads fit?

61reoldsman

Very nice looking Cutlass ! Don"t bother with big block heads when # 5 , 6, and 7's are a bolt on upgrade .

olds 307 and 403

Number 8 heads need work in the bowls, exhaust especially. There is a lip just under the valve that needs ground out. They already have 1.625" exhaust valves, just 2" or 2.07" intake valves.

oldcutlass

Whats wrong with the 330 that it came with?

martiw

When my father bought it somebody stuck a 260 under hood the only thing left was powerGlide trans and I change that to a 350 trans few years back

MDchanic

Oh, they're completely part of the USA, Chris.

They just can't send voting representatives to Congress, so they've got Taxation Without Representation, just like our brothers in Washington, DC.


Nice looking car, Marti! Welcome to ClassicOlds.

- Eric