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i used the not to fast one on my 4.15 crank 6.670 rod 12 to 1 flat top with a .484 mp hyd cam shows cranking pressure of 200 and when i built it last year with file fit rings it showed 180-185 every cyl
might have 12:1 flat top pistons BUT what is your actual compression ratio? could be much lower than 12:1 if the block wasnt decked, head volume cc'd, too thick of a gasket etc....
It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
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