GM / Holden LS2 / L76 / L77 / L98 6.0L Gen IV 3.622" Standard-Stroke Rebuild Kit with Spool Conrods and CP Bullet Pistons

LS2 / L76 / L77 / Holden L98 6.0L 3.622-inch Standard-Stroke Rebuild Kit

A forged rebuild package for the LS2 / L76 / L77 / Holden L98 6.0L Gen IV LS block family with a 4.000-inch nominal bore. Match the selected piston bore and crown design to your measured block and intended build.

Kit inclusions

• CP Bullet forged pistons with matching rings, pins and locks; selected BLSR Race options carry a displayed additional charge.
• Spool 6.125-inch conrods with ARP2000 bolts as standard, with the listed rod and bolt upgrades.
• ACL Race Series conrod and main bearings in the selected sizes.
• Two Cometic MLS 4.060-inch bore, .051-inch compressed-thickness head gaskets (C5751-051).

This version retains the 3.622-inch standard stroke and requires a suitable existing crankshaft. A crankshaft, camshaft, lifters and AFM/VVT conversion parts are not included.

Engine and head compatibility

Engine codes group the nominal block family. They do not replace checking the actual block, head casting, chamber shape, deck height, rod/pin dimensions, crank journals and bearing clearances. These pistons are for the specified LS 15-degree/L92 head geometry. Dedicated AFR/Brodix 12-degree, LS7/LSX, other rod lengths or pin sizes, and 4.125-inch-and-larger big-bore combinations are outside this listing.

L98 means the Holden 6.0L Gen IV LS engine. Earlier Chevrolet Gen I L98 and other engines reusing these codes are not covered.

Piston dimensions

All options below use 6.125-inch rods and .927 x 2.250-inch pins. BLS options use the listed 1.5/1.5/3.0mm rings; BLSR Race options use 1.2/1.2/3.0mm rings. Use the matching supplied ring set.

Head and full gasket selection

The 4.060-inch gasket opening is larger than the listed cylinder bores. Your builder must also confirm chamber/bore-edge coverage, deck and sleeve geometry, surface finish and the required compressed thickness. The optional SPG-F-LS2 full gasket set is for LS2 applications only and excludes head gaskets. Its suitability for L76, L77 and Holden L98 has not been established; do not select it for those engines without a separate fitment check.

Machining and assembly

Have the engine builder approve the final bore before ordering or machining. The presence of an oversize piston in the selector does not establish that an original-liner block can safely accept it. Measure wall/liner condition, piston-to-wall clearance, deck clearance, valve clearance and ring gaps, and use the instructions supplied with the exact parts. Compression ratio must be calculated using the actual chamber volume, piston crown, deck position and compressed gasket thickness.

Choose pin, conrod and bearing upgrades for the complete engine combination. Follow the exact rod/fastener instructions rather than a generic torque or stretch value.