Believe it or not they have been milled down so much that they measured 53cc before I put them on. I am not sure how much more they can be cut. Originally Iron gt40 heads are 62cc or so. Maybe they will need to be milled more though after overheating...
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306. AFR 185. Cam Research cam.670 Holley.Broader c4.subframes.9'' 4.11 detroit locker
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