Dyno results produce 700 hp plus on pump gas Requires 4″ bore minimum and ls3 intake rocker. Shop the best available promaxx xxtreme gm ls aluminum cylinder heads parts at the guaranteed lowest prices High performance parts delivered fast. Does any one have experience with either the liberty or promaxx ls3 heads I see their both 11 degree and the liberty says 255cc vs the promaxx says 260cc.
Promaxx 3165 xxtreme 260 ls3 rectangle large bore 59cc bare heads fits vehicle This head is for large bore power Flowing promaxx ls3 large bore, small bore, and 245cc cathedral port heads.edit When i said small bore i meant 3.898bore which is 5.7 It is not for the 5.3. At promaxx, we provide our xxtreme series at prices that make our competition cringe
Promaxx cylinder headsthe promaxx xxtreme ls 240 small bore head will take your ls1, ls2, or ls3 to levels that fully cnc ported oem heads can’t achieve Back to back dyno tests show well known fully cnc ported heads fall 70hp short of this 240cc as cast monster On identical engines, there is no comparison Our small rectangle is a beast 5.7 ls1 with moderate cams made over 605hp on.
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