D15, D16, D17 and Mini-Me swaps
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By breez
#170914 I wanted to know if I would be able to mill my head .025 mm and would the result be higher compression??
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By chrono404
#170915 if it hasn't been done already then yes, and your compression would go from 9.14:1 to 9.16:1 Assuming you have a stock engine.
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By breez
#170917 wat about .040 mm ?? :thumb: with adjustable cam gear and deck about .020 mm ?
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By d-mon
#170965 z6/d15b vtec head can go -.06 with a big cam with p28 or p08 piston.
any farther and you will most likely need deeper valve reliefs, depending on your cam.
vtec heads are a pain to 'clay'
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By breez
#170978 yea ok well I wanna try to get a lil more compression do I have to put in a bigger cam or could i just do a mild mill ?
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By d-mon
#171123 a cam will not affect your compression.
but it can open your valves more, bringing them closer to the piston.