RAMS Cylinder Head Address

GM 6.0

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853 was used on 99-00 LS1 engines.
241 was used on 01-04 LS1 engines.

'02-'04 LS6 243 heads found in the Z06 and CTS-V also had the sodium filled.

The LS2 243 heads, found on the '05-up LS2's, are the same LS6 head but with solid stem valves in them.

The 243 head is the 01+ LS6/LS2 head.
It has a smaller 64.45cc chamber for more compression (10.5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports.

as valve and chamber sizes are consistent.

chart  on ls Head

CYLINDER HEAD CASTING NUMBERS
Casting No. Description Valve Sizes Int./Ex. Chamber (cc)
Cathedral Port
241 LS1 2.00 / 1.55 67 cc
243 / 799 / 823 LS1 / LS6 2.00 / 1.55 65 cc
706 / 862 / 895 LM4 / LM7 / LR4 1.89 / 1.55 61 cc
853 / 806 / 933 LS1 (perimeter) 2.00 / 1.55 67 cc
Rectangle Port
317 / 035 LQ4 / LQ9 2.00 / 1.55 71 cc
373 / 873 LQ4 2.00 / 1.55 71 cc
364 / 716 / 823 L92 / LS3 2.165 / 1.59 68 cc
452 LS7 2.20 / 1.61 70 cc

The LQ4 cylinder head can be found in the list below. 2007 up for rectangle ports.

Chevrolet Express/GMC Savana
Chevrolet Silverado 2500 Pickup, 3500 Pickup, Crew Cab, and Chassis Cab/GMC Sierra 2500 HD Pickup and Crew Cab, C3, Denali, and 3500 Pickup and Chassis Cab, 1500HD Crew Cab
Chevrolet Suburban/GMC Yukon XL Denali
Hummer H2 SUT
GMC Yukon Denali

LQ9 Applications:

2002-2006 Cadillac Escalade
2002-2006 Cadillac Escalade EXT
2003-2006 Cadillac Escalade ESV
2003-2007 Chevrolet Silverado SS
2004-2005 Chevrolet Silverado and GMC Sierra Vortec HO Edition
2006-2007 Chevrolet Silverado and GMC Sierra VortecMAX Option


GM 6.0 top

GM 6.0 Casing 243

 

 

HAG 6.0
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