Page 203 of GM Performance Parts 2006 Catalog by GM Parts Direct

Bowtie Sportsman Bare Block, Nodular Four-Bolt Splayed Caps Tall Deck Bowtie Race Bare Block (rear) BOWTIE RACE BLOCKS (CAST IRON) These blocks are premium Bowtie big-block castings, built for the engine builder who wants to machine their race block to their racing application. All of these blocks have thick deck surfaces, improved oiling, improved coolant flow, premium fasteners, premium 4-bolt steel splayed bearing caps everything you need to start up a serious race program. If you want to make 1200 big-block horsepower for your drag car, then buy one of these blocks and get to work. Hey, lets go racing! See chart on page 196 for complete specifications. Bowtie Race Block Technical Notes: Available in short deck (9.800") or tall deck (10.200") Accepts Mark IV, Gen V- VI cylinder heads Use Gen V head gaskets with Mark IV and Gen V cylinder heads Use Gen VI head gaskets with Gen VI cylinder heads Blind tapped head bolt holes, extra inner head bolt bosses provided Requires Mark IV design two--piece rear main seal oil pans Requires Mark IV design crankshafts Can use Mark IV and Gen V-VI cams, timing sets, lifters and timing cover (Jesel belt drive cover may need machining for clearance) CNC-machined to +/-.001" tolerance 4-bolt SAE 8620 main caps, 16 splayed on center 3 mains Machined mechanical fuel pump pad Priority main oiling wet-sump system Provisions for dry sump oil line provided Honed cam and crankshaft bore Siamese Cylinder bores Improved cooling around No.1 cylinder .842" lifter bores, max 1.06", may be relocated Check distributor gear clearance at bottom of No.8 cylinder bore Each block supplied with sonic test data sheet 24502500 Standard Deck Bowtie Race Block CNC-machined cast iron 4-bolt block 4.240" finished bore 4.600" max bore (.250" min wall thickness) Standard deck height (9.800") Tested to 1200 horsepower! 24502502 Tall Deck Bowtie Race Block CNC-machined cast iron 4-bolt block 4.240" finished bore 4.600" max bore (.250 min wall thickness) Tall deck height (10.200") Tested to 1200 horsepower! Tall Deck Bowtie Race Bare Block (front ) 201

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