[70CitrusZ]

My 70 LT-1 is built with pistons designed to produce 11 to 1 with 64 cc chambers.
Stock solid cam set at .024 and .026 lash
My decks were cut to clean up to parallel, about 7 thou.
I used head gaskets with a .039 compressed thickness.
Before I assembled heads, they were cylinder matched and laid back,and smoothed to eliminate hot spots. After that the chambers measured 61 to 61.5 cc.
I had hardened exhaust seats installed.
So far I have had no problem running 93 octane pump fuel.
Originally I fired it on 100 octane av gas, but found it ran cooler and still without detonation on unleaded 93.
Mark.