WOW? wtf i could have swore i replied to this post,hmm,anyway try high-proformance gaskets and after running your motor for about 10 min. go back and tighten all the header bolts as much as you can
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www.superchevy.cjb.net
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1972 Custom Deluxe/10
mild 350: Hedmen headers and dual 3" exhaust ,harlin sharp roller rockers ,MSD ingnition ,Mallory dual point K&N 14x4 air cleaner ,Holley 600 4bbl ,Edelbrok Proformer intake
TH350 with lock up verter and 1600 stall
American Racing 15x8.5 and michelan 28x8.55
CHEVY makes HORSEpower,while ford makes ponypower
Bowtie or nothing!