ProMaxx Performance Products
The porting of performance cylinder heads has long been an essential part of attaining maximum horsepower. ProMaxx Performance began business by revolutionizing the CNC cylinder head market. They specialize in cylinder heads for small block Chevy, big block Chevy, and small block Ford. ProMaxx designed their own CNC programs to port chambers, bowls, and runners to maximize air and fuel flow. JEGS stocks ProMaxx Performance Products at the best prices so get the most out of your vehicle today!
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PROMAXX PERFORMANCE
Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (185cc)
Part Number: 723-9186S

PROMAXX PERFORMANCE
Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (185cc)
Part Number: 723-9186S

PROMAXX PERFORMANCE
Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (215cc)
Part Number: 723-9217S

PROMAXX PERFORMANCE
Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (215cc)
Part Number: 723-9217S

PROMAXX PERFORMANCE
GM LS Series Gold Dual Valve Spring Kit Includes: 16 ProMaxx Dual Gold Springs
Part Number: 723-8401

PROMAXX PERFORMANCE
GM LS Series Gold Dual Valve Spring Kit Includes: 16 ProMaxx Dual Gold Springs
Part Number: 723-8401

PROMAXX PERFORMANCE
XXTREME Assembled 255 cc Cathedral Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
Part Number: 723-3156A

PROMAXX PERFORMANCE
XXTREME Assembled 255 cc Cathedral Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/59 cc Combustion Chambers
Part Number: 723-3156A

PROMAXX PERFORMANCE
XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/63 cc Combustion Chambers
Part Number: 723-3344

PROMAXX PERFORMANCE
XXTREME Assembled 240 cc Rectangle Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/63 cc Combustion Chambers
Part Number: 723-3344

PROMAXX PERFORMANCE
XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/59 cc Combustion Chambers
Part Number: 723-3146A

PROMAXX PERFORMANCE
XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3.898 in. Bore w/59 cc Combustion Chambers
Part Number: 723-3146A

PROMAXX PERFORMANCE
CHR640N Cylinder Head for 1991-2004 Jeep 4.0L Inline 6-Cylinder Engine
Part Number: 723-CHR640N

PROMAXX PERFORMANCE
CHR640N Cylinder Head for 1991-2004 Jeep 4.0L Inline 6-Cylinder Engine
Part Number: 723-CHR640N

PROMAXX PERFORMANCE
CHR620N Replacement Cylinder Head for 1998.5-2002 Dodge Trucks w/Cummins 5.9L 24V Non-Common Rail Diesel Engine
Part Number: 723-CHR620N

PROMAXX PERFORMANCE
CHR620N Replacement Cylinder Head for 1998.5-2002 Dodge Trucks w/Cummins 5.9L 24V Non-Common Rail Diesel Engine
Part Number: 723-CHR620N































