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This head is for large bore power w/ a 63cc combustion chamber In addition to the ls head, promaxx decided to dive into a world where an affordable aluminum cylinder head isn’t exactly commonplace — the diesel market. Dyno results produce 700 hp plus on pump gas

Requires 4″ bore minimum and ls3 intake rocker. We put these on top of a stock 5.7 bottom end with 50k miles. 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

At promaxx, we provide our xxtreme series at prices that make our competition cringe Going fast doesn’t have to break the bank, so get a pair of xxtreme series heads today. Promaxx performance xxtreme assembled 260 cc rectangle port cylinder heads for ls3 w/4 in Bore w/63 cc combustion chambers is rated 5.0 out of 5 by 1

Rated 5 out of 5 by hammer99 from incrediblei bought and waited 4 month for these heads

There was a valve shortage

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