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You could do the tree monkey trick and get a sacrificial piston and keep taking the top edge off and test it to find the right duration before you grind too far.thanks steve, thats pretty much where my thoughts were headed. certainly dont wanna lose any more torque or compression by raising ex if i dont have to. seems like there should still be room for a touch less blowdown. and 81 intake is pretty conservative for what im after. if i were to have started with a untouched cylinder, it would be turning out a bit differently. ex port and intake are way wide already so dont wanna go crazy w durations on those