Originally Posted by stegman
I have a fresh 383 stroker in my roadster and after tuning and general cam breakin with a couple of short drives iam getting some blowby with and without the pvc. i know i should get some until its broke in, but it seems a little excessive to me. i pulled the plugs and they look even and pretty good telling me no broke rings. could timing effect blowby, iam running 76cc heads on 8cc dome pistons with a compression ratio of about 10.5 on 93 octane. does anybody think race gas or 100 octane avfuel would help. total timing is only 32 advance. thanks agian........
Do a leak down test at TDC to see if there are ring seal issues, If your block was not plate honed it will be hard to get the rings to seal.