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This head is for large bore power w/ a 63cc combustion chamber It is not for the 5.3. Dyno results produce 700 hp plus on pump gas

Promaxx 3162: XXTREME Assembled Cylinder Heads | LS3 w/4 in. Min. Bore

Requires 4″ bore minimum and ls3 intake rocker. When i said small bore i meant 3.898bore which is 5.7 Shop the best available promaxx xxtreme gm ls aluminum cylinder heads parts at the guaranteed lowest prices

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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

High performance premium cylinder heads and components for ls & lt applications We design and manufacture a large line of cylinder heads for ls1, ls3, ls7, ls9, lt1, lt2 & lt4 engine platforms If you are looking for more power and better performance from you ls or lt engine, look no further. At promaxx, we provide our xxtreme series at prices that make our competition cringe