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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.
Browse for more products in the same category as this item Cylinder heads > promaxx cylinder heads > chevrolet _ ls series Promaxx 3165 xxtreme 260 ls3 rectangle large bore 59cc bare heads fits vehicle This head is for large bore power
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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.
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