Page 141 of GM Performance Parts 2006 Catalog by GM Parts Direct

ROX Race Block (rear) ROX Race Block (bottom) ROX Race Block (front) 139 GM PERFORMANCE PARTS R0X RACE BLOCKS NEW The new GM small-block R0X V-8 engine package is the next evolution in the design of the Chevrolet small-block. It has been successfully raced in ARCA the Baja 1000. The design incorporates wider 4.500" bore centers for improved engine architecture. The ROX package has dedicated components to take advantage of the spread bores such as cylinder heads, intake manifolds and other aftermarket parts. These parts can be purchased from your local GM Performance Parts dealer. Specialty parts can be purchased from aftermarket suppliers. See chart on page 132 for complete specifications. GM Performance Parts R0X Block Technical Notes: CNC-machined, Cast iron competition block 7/16" Priority main oil system 9.025" deck height 4-bolt R0X-block specific SAE 4140 doweled steel mains 17 splayed caps on center 3 mains Center main thrust 4.166" rough bore (siamese bores) 4.250" max bore (min .225" wall thickness) 4.500" bore and main spacing Special cylinder head bolt pattern, 3/8-24 UNF threads 68mm (2.677") cam bearing bores for 60mm roller bearings Cam tunnel is closed (no oil drain to rotating assembly) Cam tunnel raised 1.572" to 6.093" .835" lifter bores (1.06 max.) 42 intake, 52 exhaust, can be relocated Cam lobe squirter provisions Piston squirter provisions, not machined -06AN water drains AN O-ring pipe plugs (4) Center lifter valley drains (drilled tapped) Steam holes drilled between cylinders .750" below deck surface Dry sump only (no oil filter boss) Oil pan rails spread to 10.61" Front motor mounts only Dual starter mounts Tested to over 800 horsepower! 25534453 283 Main, ROX Series Block SB2.2 Lifter Pattern CNC-machined SB2.2 lifter pattern for P/N 88958667 cylinder head 25534452 283 Main, ROX Series Block Gray Iron CNC-machined Can be machined for standard, SB2 and splayed valve lifter patterns No lifter holes

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