I have an early production (sept 67) 1968 Firebird all numbers matching 400HO
4sp.
WQ block with VIN stamp
216 heads (weird i know)
S 068 camshaft
It runs fine on CA pump 91 gas but better if mixed with 100 octane. The vapor lock deal is much worse with ethanol fuel, does not matter what compression you have. the lower boiling point of the fuel with carburetion sucks.
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