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Old 12-14-2003, 07:25 PM
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Likely a set of dart Iron Eagle heads with 72cc chambers and 180cc runners with 2.02 1.60 valves. the humps would have to be ported pretty good, along with the valves installed, they`ll likely need valve guides and the studs replaced with springs, locks, retainers, the works and your looking at about $800 unless you can port them yourself and get the proper results and this isn`t counting what you paid for them to start with, it just makes better sense and cheaper prices just to go with a aftermarket head. if you find a set of ready to go double humps then you could have them bowl ported but you still likely won`t reach 425 horses, more likely 385. also comes down to what pistons your running since the double humps have 64cc chambers and with flat top pistons in a 383 will put you over 10:1 compression which won`t survive on pump gas if this is street intended.
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