351 Windsor mods
Elder User
Joined: Sep 2005
Posts: 647
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From: Brumley, MO
I think all GT-40 heads require different headers than a normal 351/other small block headers, I know for sure the P's do, but I think the regular GT-40 heads do also, and I have no clue about the GT-40X heads. The P's also have a wierd plug angle or something like that.
Posting Guru
Joined: Mar 2007
Posts: 1,649
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I don't have any personal experience using them, but I have seen pictures of the heads and they come out almost 90* from the head compared to the angle on which the others sit.
GT-40's are at the normal angle, and I think the GT40-X and others,(GT-303, GT40Y), are as well, but I not 100% sure.
It might be wise to try and match your headers up to a set if possible beforehand to see if and how bad an issue you might have.
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Joined: Mar 2013
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From: In my house..
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krasmussen
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Apr 9, 2007 09:38 AM
