Engine compression: cam,stock Gt?

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My buddy did the 2031 on a explorer motor and it was fine, he had plenty of clearance.
Lopes like Crazy and makes nice power, but now hes got a PS1c on top....made 420hp on 8lbs.

i have the same cam, NEW in tha box and some other stuff for this combo fer sale.

if your interested:

[email protected]