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Price: $165.00
Part #: 12638427
Engine(s): GM Gen III & IV V8 engines except Displacement On Demand (DOD) & camshaft phaser applications
Firing order: 1-8-7-2-6-5-4-3 (per standard GM V8 cylinder numbering)
Intake Exhaust
Valve adjustment: HYD HYD
Lobe lift (inches): 0.328 0.325
Valve lift (inches): 0.558 0.553 with 1.7 rocker ratio
Valve lift (inches): 0.590 0.585 with 1.8 rocker ratio
Duration @ 0.006\":
Duration @ 0.050\": 211 230
Lobe Separation Angle (LSA):
Degrees of advance:
Valve timing @ 0.050\" tappet lift: Opening Closing
Intake -17.0 BTDC 48.0 ABDC
Overlap angle -24.5
Exhaust 57.5 BBDC -7.5 ATDC
These specs are with cam installed at: 122.5 intake center line 122.5 exhaust center line
Recommended installation angle: 122.5 (intake center line angle)
Recommended valve springs: GM LS9 or LS6/LS2/LS3 valve springs (~90 lbs seat/~290 lbs open) 1.7:1 rocker applications
LPE checked and sorted LS9 valve spring kit (PN L230045297) 1.7:1 rocker applications
LPE LPE beehive LSx spring set (PN L230055297) 1.7 or 1.8:1 rocker applications
Comp Cams 26918 valve springs 1.7 or 1.8:1 rocker applications
Notes:
122.5
0.0
Camshaft: ZR1 Corvette (LS9 engine)
LPE recommends always degreeing in the camshaft to confirm the camshaft location.
LPE recommends thoroughly cleaning the camshaft and liberally applying engine assembly lube prior to installation.
This camshaft is ground with 1.0 degree of retard (-1.0 advance) so no offset bushing or adjustable timing gear should be needed.
LPE also recommends checking for proper pushrod length when installing a new camshaft.
Most 2006-2013 Gen IV engines use a single bolt camshaft (except the LS7 & LS9). These engines will need an installation kit from LPE.
12638427 LS9 camshaft information v1.0.xls