well I would like to bump up my compressin in my sbc 350, I've found a set of 327 heads. these are the casting numbers 3782461. some ppl say that they are very prone to cracking and others say they are great, just curious of your opinions.

The other question I have is, what would I be running for compression, I want to be able to still run good pump gas.

the block has not been decked, it does have flat tops, and as far as I know the heads have not been touched.

any info would be appreciated. Thanks