LSR Rectangular Port 239/255 Hydraulic Roller Cam for GM LS GEN III/IV
HYDRAULIC ROLLER-Broad top end power range for high rpm, race only LS engines with aftermarket rectangular port cylinder heads & higher compression.
54-471-11
Specifications
Engine Family: GM LS GEN III/IV 3-Bolt 8 Cylinder (1997-2015)
RPM Operating Range: 2,400-7,200
Grind Number: 289LRR HR14
Cam Type: Hydraulic Roller
Lifter Style: Hydraulic Roller
Camshaft Series: LSR Rectangular Port All Out Power
Usage: Strip
Advertised Intake Duration: 289
Advertised Exhaust Duration: 305
Intake Duration at .050 Inch Lift: 239
Exhaust Duration at .050 Inch Lift: 255
Intake Valve Lift: 0.624
Exhaust Valve Lift: 0.624
Lobe Lift Intake: 0.367
Lobe Lift Exhaust: 0.367
Lobe Separation: 114
Intake Centreline: 110
Exhaust Close ATDC: 35
Intake Open BTDC: 34
Exhaust Open BBDC: 89
Intake Close ABDC: 75
Camshaft Gear Attachment: 3-Bolt