[67MercCat]

oops! can the moderators please move this to the discussion threads I accidentally posted this in the wrong section.

 

[Cougrrcj]

Well,...

GT40s have 64cc chambers, Ps have 58cc chambers.

Ps have a revised spark plug location and angle so aftermarket headers may or may not fit.

 

[jk69cat]

and the p's out flow the std gt40's