on the back of the block on my 454 there is a stamping that says HI PERF PASS. this same stamping appears behind both heads on the block. its out of a 73' rv.



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92 CAMARO RS 25TH ANNIVERSARY LO3
91 CAMARO RS V6
83 CAMARO Z28 (new project!) TH400, 3.73 posi, 4 wheel discs, 454 in the works...

"****'em and feed'em fish heads." daniel's building and construction.

 

They all say that. AFAIK every Mark IV non-tall-deck block has that on it. Ignore it.

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"So many Mustangs, so little time..."

 

thanks... pretty much what i anticipated.