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03-07-2002, 02:29 PM
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#3 |
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Sober voice of Reason
Join Date: Nov 1998
Location: Kelowna, B.C., Canada
Posts: 1,514
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on the front and back of the head:
3 vertical lines=GT-40 4 vertical lines=GT-40P There will also be a "GT" stamped near the #1 spark plug hole. There's lots of debate as to which are better, the main differences are that the P head has a smaller combustion chamber and a 1.46" exhaust valve whereas the regular GT-40 has a 1.54". The spark plug angle is different for the P heads and makes some headers not fit. I've seen tests that had the non P head outflowing the P head, especially on the exhaust side but there are people on this board who will disagree with me. Either way, they're a good deal and you'll pick up a ton of power over the stockers.
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393W: AFR 205's, hydraulic roller, TKO600. |
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