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12226
 
Rocker-Arms, LS1/LS6/LS2 (1.85 Ratio)

SLP is proud to re-release our 1.85-ratio rocker arm package for GM "Gen III" engines which includes LS1, LS6, LS2 as well as 4.8, 5.3 and 6.0 liter truck engines. Designed as a true bolt-on replacement, these new rockers require NO valve cover or cylinder head modifications (please reference our instructions for proper installation).
SLP exclusive design is based off of the stock rocker providing an OEM quality steel construction and a roller bearing trunion which results in a 10% increase in valve lift over the stock 1.7 ratio rocker arms and gains of up to 12 horsepower over stock. This package includes 16 rocker arms, detailed instructions and all required installation hardware.

This package includes:
  • 1.85 Ratio Rocker Arms 16 qty (50185)
  • New bolts 16 qty
Note 1: When using an aftermarket camshaft, please contact SLP for proper compatibility.
Note 2: LS1, LS6 and LS2 engines may require SLP springs, retainers and keepers reference chart below and part # 51185 rocker arm package when purchasing.

SLP ROCKER-ARM COMPATIBILITY CHART (with stock camshafts)
  Slp Performance Cylinder Head & Cam Package, 1999-2005 346 Cid Ls1 525 Hp
12226
SLP Cylinder Head & Cam Package, 1999-2005 346 CID LS1 525 HP

Your Price: $2,869.45

Cylinder Head & Cam Package, 1999-05 346 CID LS1 525 HP
Mach Performance Parts Does not sell products.

Save Money on this SLP AFR Cylinder Head and Cam Package

We teamed up with AFR to bring you these street/strip heads and matched them with one of our high performance LS1/LS2/LS6 cams for an even better deal. They flow enough air (up to 320 CFM intake) to work with all LS1, LS2 or LS6 small blocks as large as 427 cubic inches, down to a well-built 346. The secret to the high flow numbers is CNC porting and a newly-designed combustion chamber with a double quench pad area.
Another reason we picked these heads is the rugged design that can live on top of a high-power engine. Dont worry if you use nitrous or a blower because AFRs 3/4 inch-thick deck is standard, along with reinforced rocker stud bosses, thick-wall runners and interlocking ductile iron valve seats. To maximize performance, we include double springs (.600 inch max lift) and titanium retainers.
To really get the full potential of these heads we matched them to our most aggressive cam for engines in the 346 CID/5.7L range.
Camshaft Specs: Valve Lift Duration@.050
in: .590" 236º
ex: .590" 236º

Centerline - 112º
Lobe Separation - 112º

Best of all, youll save $25 over the cost of purchasing the parts separately!

NOTES: These heads are ready to bolt on, but we recommend that final assembly of any engine be performed by an experienced, professional mechanic.

AFR SLP Cylinder Heads feature:
  • Intake flow up to 304 CFM at .500 lift, 320 CFM at .600 lift @ 28 of H2O.
  • Exhaust flow up to 250 CFM at .600 lift @ 28 of H2O (using 1-7/8 inch exhaust pipe).
  • 225cc heads with 62cc combustion chamber.
  • CNC ported intake and exhaust ports, and combustion chambers.
  • 2.080 intake, 1.600 exhaust standard length valves.
  • 3-angle radiused valve job.
  • 2.080 intake, 1.600 exhaust valves.
  • 7° titanium retainers and valve locks.
  • 1.290 inch double springs, 135 lbs seat, .600 inch maximum lift.
  • Emissions-legal CARB EO #D250-4.
  • Fully assembled, ready to bolt-on.
  • Matched .590/236º int. 590/236º exh. camshaft.


SLP Performance Cylinder Head & Cam Package, 1999-2005 346 Cid Ls1 525 Hp

YEAR APPLICATION ENGINE Are SLP springs & retainers required? Intake Valve Lift with SLP 1.85 rocker Exhaust Valve Lift with SLP 1.85 rocker
2005 C6 Corvette LS2 Yes 0.600 0.596
2002-2004 Z06 Corvette LS6 Yes 0.600 0.596
2001 Z06 Corvette LS6 Yes 0.569 0.568
2001-2004 Corvette LS1 No 0.505 0.521
2000 Corvette LS1 Yes 0.544 0.544
1997-1999 Corvette LS1 No 0.514 0.521
2001-2002 F-Body LS1 No 0.505 0.521
1998-2000 F-Body LS1 Yes 0.544 0.544
2005 GTO LS2 Yes 0.600 0.596
2004 GTO LS1 No 0.505 0.521
2006 CTS V LS2 Yes 0.600 0.596
2004-2005 CTS V LS6 Yes 0.600 0.596
2005 SSR Truck LS2 Yes 0.566 0.564
2001-2005 CK Truck LQ4, LQ9 No 0.505 0.521
1999-2005 CK Truck LR4, LM7 No 0.497 0.507
1999-2000 CK Truck LQ4 No 0.497 0.507
2003-2004 ST Truck LM4 No 0.497 0.507
2002-2005 CK Truck L59 No 0.497 0.507





RECOMMENDED PARTS
PARTS THAT CAN ENHANCE THE APPLICATION OF PART# 50185
PART NUM DESCRIPTION PRICE
53002 Valve Springs, LS1/LS6/LS2 High-Performance (set of 16) $219.95
53103 Retainer, Titanium Valve-Spring LS1/LS6/LS2 (set of 16) $169.95
66345 Keepers, Valve LS1/LS6/LS2 (Set of 32) $22.95




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