GT-40P heads

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10-01-2011, 04:29 PM

djrobb.626

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Join Date: Feb 2011

Location: gt

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GT-40P heads

I came up on a set of GT-40P heads for my 95' Gt. Has anyone ever delt wit these heads. Are they smog legal,what headers work wit these and spark plugs ect. Will this be a Difficult job?

10-01-2011, 04:36 PM

AdderMk2

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IIRC they used Autolite 104 plugs, and you want FMS unequal length shirties, or Mac "P" headers.

Last edited by AdderMk2; 10-01-2011 at 04:38 PM.

10-01-2011, 05:00 PM

mustangGT86_05

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Join Date: Mar 2011

Location: OH

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I have also read you have to adjust timing to get them to work right, but that may be false. Do a little searching and you'll find its an involved job compared to other heads, I convinced myself to not go that route

10-01-2011, 05:15 PM

AdderMk2

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Quote:

Originally Posted by mustangGT86_05

I have also read you have to adjust timing to get them to work right, but that may be false.

it is false. and its no harder than changing head gaskets on E7's

10-03-2011, 12:33 AM

Dj_Seph

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Join Date: Jul 2009

Location: Arizona

Posts: 1,127

Indeed. I have some. Now ported as far as they can do with a pretty aggressive cam setup. Love it. If you got them cheap, get them ported. If you don't, then it's pointless to take off your stockers for them.