So Charlie you run the stock exhaust size on your 170? 1 7/8 or 2 inch? I agree with you im not a 170 guy, i just remember reading the 170 has the pistons higher to the deck so i would be carefull milling the head so much as .100 but you always got to measure everything then measure again to be safe im not a 170 guy. its already hard hot rodding a six banger and expensive and even harder when starting with the smaller platform displacement 170
