What's the difference in porting and milling heads?
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Milling is shaving the whole bottom where the head meets the deck of the block. It lowers the compression adding a lol power. Porting heads is the inside runners and chambers getting cleaned and smoothend for better air flow
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your going to need to get them checked...you can do a play-doh job on it...put the heads on with two small strips of play-doh over the piston where the valves would hit and turn the motor over...thats the gettho way...