I have found that the dyno has a lot to do with peak numbers. I took my 427 to Dale Mears Racing and used his dyno. It would have shown another 75 HP if I had taken it to Tommy's Auto Machine and another 100 HP if I had taken it to the dyno in Evansville. Apparently there is another dyno close that would have shown about 150 more.
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Freddie
1969 Camaro RS/SS396 (427) 4 speed
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