Page 138 of GM Performance Parts 2006 Catalog by GM Parts Direct

One-Piece Rear Main Seal Race Block (front) GM PERFORMANCE PARTS RACE BLOCKS Our race blocks take the guess work out of what block you need to make big horsepower that is competition tested in NASCAR BUSCH and NHRA Competition Eliminator! Only GM Performance Parts can offer you such a huge selection of race blocks that have been precision, CNC-machined 3 with tighter tolerances than our Bowtie blocks before you even get them. These blocks feature full race-prep machining, 4-bolt splayed 4 main caps, and the very highest grade of materials throughout. When your competition has spilled their guts all over the racetrack, youll still be in the show thanks to your GM Performance Parts race block! See chart on page 132 for complete specifications. GM Performance Parts Race Block Technical Notes: These blocks are CNCd to +/-.001" machining tolerances! Cylinder decks, front and rear of case, oil pan rail surfaces and head dowel pins are blueprinted! Non-standard cam bearings required (see each block for details) Cam bosses are enlarged to allow machining for the use of larger bearings Extra thick main bearing bulkhead machined at 5 Premium quality main studs SAE 8620 steel main bearing caps Billet wet sump rear main cap can be adapted to dry sump with plugs Bearing cap inner bolts are spread 0.210" to allow machining for the use 400 journal crankshafts Priority main oiling system 2-piece rear-main crankshafts pre-1986 oil pans required Extra thick deck surfaces with blind-tapped head bolt holes for improved head gasket sealing Cylinder bores have a nominal wall thickness of .340" 0.225" min. cylinder bore wall thickness at 4.155" bore, Sonic bore check data sheet provided These blocks may require clearancing the top of lifter bores for some aftermarket mechanical roller lifters Timing system clearance should be checked before engine assembly Lifter valley oil scavenging boss behind cylinder #8 below bell housing flange is not drilled tapped Oil dipstick holes are not drilled A. 24502501 350 Main, 283 Bore Cast Iron Bowtie Race Block Cast iron competition block right out of the box 4-bolt SAE 8620 steel mains, 20 splayed caps on center 3 mains 2.00" O.D. cam bearings (1.867" I.D.) P/N 12370843 required at all five locations 3.875" finished bore (non-siamese bores) 4.030" max bore 9.025" deck height Oil galleries for dry sump system are oversized and tapped for pipe plugs Supplied with sonic data sheet Tested to over 650 horsepower! 3CNC or computer numerical controlled machining is an automated machining process that guarantees exact tolerances. No one offers as many CNC-machined blocks as GM Performance Parts! No one. 4Splayed main caps have additional material holding the crankshaft in the block. This makes it even more unlikely that youll throw the crank through the oil pan. Race Block (rear) CHEVY SMALL-BLOCK V-8 136 Two-Piece Rear Main Seal A A A A

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