- Engines & Components
- Cylinder Heads
- Promaxx XXTREME GM LS Aluminum Cylinder Heads
Extreme Performance for LS Engines that Won't Break the Bank
ProMaxx EXXTREME Series aluminum cylinder heads for GM LS engines have runners and combustion chambers designed for maximum airflow.
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PART TYPE
PART TYPE
BRAND
BRAND
RATING
Engine MakeSize
Intake Runner Volume cc
Intake Valves Included
Rocker Arm Studs Included
Valve Seat Material
Part Fitment
Valve Springs Included
CNCMachined Combustion Chamber
CNCMachined Exhaust Runner
Cylinder Head Style
Cylinder Head Finish
Valve Guide Material
Finish
Intake Valve Angle
Valve Seat Machine Style
Exhaust Valves Included
PRICE
LS1, LS2 w/3.898 in. Min. Bore [240 cc Rectangle Ports]
ProMaxx Performance 3345
ProMaxx Performance XXTREME Bare 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$1,609.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
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$1,609.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
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ProMaxx Performance 3346A
ProMaxx Performance XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$2,470.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,470.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3346P
ProMaxx Performance XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$2,305.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
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$2,305.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
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Lowest Price Guarantee
ProMaxx Performance 3347
ProMaxx Performance XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$2,718.57
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
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Lowest Price Guarantee
$2,718.57
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3348
ProMaxx Performance XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$2,857.14
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
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Lowest Price Guarantee
$2,857.14
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
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ProMaxx Performance 3349
ProMaxx Performance XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$3,222.86
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
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Lowest Price Guarantee
$3,222.86
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
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ProMaxx Performance 3340
ProMaxx Performance XXTREME Bare 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/63 cc Combustion Chambers
$1,791.43
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$1,791.43
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3341A
ProMaxx Performance XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/63 cc Combustion Chambers
$2,470.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,470.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3341P
ProMaxx Performance XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/63 cc Combustion Chambers
$2,376.99
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,376.99
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3342
ProMaxx Performance XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/63 cc Combustion Chambers
$2,718.57
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,718.57
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3343
ProMaxx Performance XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/63 cc Combustion Chambers
$2,857.14
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,857.14
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3344
ProMaxx Performance XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/63 cc Combustion Chambers
$3,222.86
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$3,222.86
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
LS1, LS2 w/3.898 in. Min. Bore [245 cc Cathedral Ports]
ProMaxx Performance 3145
ProMaxx Performance XXTREME Bare 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/59 cc Combustion Chambers
$1,791.43
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$1,791.43
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3146A
ProMaxx Performance XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/59 cc Combustion Chambers
$2,470.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,470.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3146P
ProMaxx Performance XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/59 cc Combustion Chambers
$2,555.71
Estimated to ship direct from manufacturer on 05/22/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,555.71
Estimated to ship direct from manufacturer on 05/22/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3147
ProMaxx Performance XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/59 cc Combustion Chambers
$2,718.57
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,718.57
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3148
ProMaxx Performance XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/59 cc Combustion Chambers
$2,857.14
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,857.14
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3149
ProMaxx Performance XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/59 cc Combustion Chambers
$3,222.86
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$3,222.86
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3140
ProMaxx Performance XXTREME Bare 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/63 cc Combustion Chambers
$1,791.43
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$1,791.43
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3141A
ProMaxx Performance XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/63 cc Combustion Chambers
$2,470.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,470.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3141P
ProMaxx Performance XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/63 cc Combustion Chambers
$2,305.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,305.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3142
ProMaxx Performance XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/63 cc Combustion Chambers
$2,718.57
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,718.57
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3143
ProMaxx Performance XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/63 cc Combustion Chambers
$2,857.14
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,857.14
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3144
ProMaxx Performance XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/63 cc Combustion Chambers
$3,222.86
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$3,222.86
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
LS1, LS2 w/4 in. Min. Bore [255 cc Cathedral Ports]
ProMaxx Performance 3155
ProMaxx Performance XXTREME Bare 255 cc Cathedral Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$1,874.29
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$1,874.29
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3156A
ProMaxx Performance XXTREME Assembled 255 cc Cathedral Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$2,582.86
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,582.86
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3156P
ProMaxx Performance XXTREME Assembled 255 cc Cathedral Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$2,410.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,410.00
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3157
ProMaxx Performance XXTREME Assembled 255 cc Cathedral Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$2,840.99
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,840.99
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3158
ProMaxx Performance XXTREME Assembled 255 cc Cathedral Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$2,985.71
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,985.71
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
ProMaxx Performance 3159
ProMaxx Performance XXTREME Assembled 255 cc Cathedral Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
$3,367.14
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$3,367.14
Estimated to ship direct from manufacturer on 05/10/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee