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  1. J

    physical difference between TF240's and 270's?

    This may be dumb, but is the an outside difference between the 240 and 270 heads? I mean like the victors, -1's, stage VI,s...etc. Can 270's replace 240's with no other change (like intake port height on victors)
  3. J

    516 to 906 head on '66 440?

    Say I have a bone stock 66 440 (516 heads). One valve is bad on the 516's. Have a set of 906's that are fine shape. Is anything gained or lost by tossing on the 906's? Other than the comp drop, which is how much?
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