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promaxx heads

  1. 327 head choice/power/safe rpm?

    i have a 2 bolt main large journal 327 with arp bolts and a cast crank turned .010, speed pro hyper +.040 flat tops, eagle sir i beam rods with arps, cam is a summit k1104 specs are 224/224, .466 lift, 114 lsa. i have been looking at a bare set of promaxx(formerly patriot?) cast iron 2150 heads...