Dyno results produce 700 hp plus on pump gas When i said small bore i meant 3.898bore which is 5.7 Requires 4″ bore minimum and ls3 intake rocker.
Promaxx 3162: XXTREME Assembled Cylinder Heads | LS3 w/4 in. Min. Bore
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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
