You want a 7/16-14 tap and it should have something like H3 on it. Any number bigger than a 3 is an over size tap. You shouldn't use it if it is an H5 or bigger.
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89 GT convertible, Kenny Brown level 5, Edelbrock performer, AFR 165's, Comp cams XE270HR, C&L 76, 24# inj, Crane 1.7's, 70mm BBK throttle body 298.2 hp 328.2 tq Mustang dyno
"Our lady of blessed acceleration don't fail me now" Elwood Blues
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