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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.
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. Ls3 style 11 degree chevrolet heads to fit gen iii ls1/2/6 3.90' bore engines 248cc intake runners, 69cc combustion chambers
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 Get the best performance with promaxx performance xxtreme assembled 260 cc rectangle port cylinder heads for ls3 w/4 in
Bore w/63 cc combustion chambers 3161a parts at jegs. 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.
I see their both 11 degree and the liberty says 255cc vs the promaxx says 260cc. The 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 pump gas 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
There was a valve shortage We put these on top of a stock 5.7 bottom end with 50k miles. Seems a lot hear want to not only shit on china heads and also group them all together I have been saying for years that both flotek and promaxx are a good quality heads that make good power
Well here is eric's video comparison between bbc promaxx 317 with 2.300 intake compared to the afr. Performance cylinder heads project x series ls xxtreme series maxx series series one Diesel cummins gm durramax powerstroke Description promaxx 3165 xxtreme 260 ls3 rectangle large bore 59cc bare heads fits vehicle
Say an engine that's not in heads up class or going for ever hundredth, and looking for 1000 or less hp, they there a very good and respectable option imo Both flotek and promaxx can make big power as well From chads site 505 bbc Bore w/59 cc combustion chambers 3166p parts at jegs.
Get the best performance with promaxx performance xxtreme bare 260 cc rectangle port cylinder heads for ls3 w/4 in Bore w/59 cc combustion chambers 3165 parts at jegs. Size for size, no one can touch this bad boy If you have a 4.00 inch plus bore size engine and need cathedral heads, look no further to push your power to the xxtreme
Bore w/59 cc combustion chambers 3166a parts at jegs. Bore w/63 cc combustion chambers 3164 parts at jegs. Bore w/63 cc combustion chambers 3161p parts at jegs. I show the dyno test results of the promaxx small bore ls3 heads
I also give flow numbers and other info on the heads Link to purchase dyno results being t.
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