gt40 to gt40p
04-06-2010, 11:16 AM
Thread Starter
Join Date: Feb 2010
Location: oklahoma
Posts: 48
gt40 to gt40p
whats the difference between gt40 and gt40p heads?
and can any one tell me what the expected hp ups maybe
04-06-2010, 11:57 AM
2nd Gear Member
Join Date: Jul 2008
Location: tennessee
Posts: 249
no noticeable difference in h.p. and i think the plug angle is basically the only difference
04-06-2010, 12:42 PM
MF Informant
Join Date: Sep 2006
Location: Missouri
Posts: 2,690
GT40Ps have smaller combustion chamber(higher compression), burn fuel more efficiently, and outflow the GT40 heads. The downside is the spark plug angle. You would have to put 90degree boots on a few plugs and maybe dimple the headers in one or two places.
04-06-2010, 05:06 PM
3rd Gear Member
Join Date: Dec 2008
Location: Iowa
Posts: 593
get the headers in my sig you need autolite 764 or equiv plugs
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