A gt-40 head will have 3 bars cast into the head on the side towards the front of the car. The gt40p head will have 4 bars marked on it. Also there will be a "gt" cast into the gt40 head, and a "gtp" cast into the gt40p head.
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89 notch-finally not stock!! ported gt40's, ported cobra intake, 65mm tb, 75mm maf, mac cai, lt's,prochamber, fms 1.6 rr, 125 shot.
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