Page 200 of GM Performance Parts 2006 Catalog by GM Parts Direct

Bowtie Sportsman Block (front) Top Four-Bolt Cap Bottom Machined Bottom (close-up) Bowtie Sportsman Block (rear) 198 BOWTIE SPORTSMAN BLOCKS For the ultimate in sportsman drag racing or extreme street performance, GMPP has a full line of big-block blocks that feature full CNC-machining 3, premium materials, and designs directly from GM. Our Sportsman blocks are available with tall decks 4, one-piece or two-piece crankshaft seals 5, feature splayed main caps 6, and can easily be stroked to 500+ cubic inches. Buy one of these blocks if you are a weekend drag racer looking to make 800 horsepower, or if you are building a serious street car with enough motor to crush the competition. Bowtie Sportsman Block Technical Notes: Available in short deck (9.800") or tall deck (10.200") Requires Gen V VI design one-piece rear main seal oil pans Machined for hydraulic roller and flat tappets CNC-machined to +/-.001" tolerance Nodular iron 4-bolt main caps, 16 splayed on center 3 mains Machined mechanical fuel pump pad Priority main oiling system Siamese Cylinder bores Gen V VI style front timing cover required All bore finishes are ready to hone to size Clearance for 4.500" stroke See chart on page 196 for complete specifications. Standard Deck Sportsman Blocks 25534363 Standard Deck Bowtie Sportsman Block 1-piece rear main seal CNC-machined cast iron 4-bolt block 4.494" finished bore 4.600" max bore Tested to 800 horsepower! 25534362 Standard Deck Bowtie Sportsman Block 2-piece rear main seal CNC-machined cast iron 4-bolt block 4.494" finished bore 4.600" max bore Tested to 800 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 GMPP! No one. 4Tall Deck blocks allow you to run a longer rod and/or a bigger stroke crankshaft for more cubic inches. More cubic inches means more power. Pump it up! 5A one-piece crankshaft seal is desirable to decrease the chance of oil leaks, but the two-piece seals allow for more aftermarket component attachments. You can retro-fit 2-piece seal blocks (built from 1965 to the present) for the one-piece seal. 6Our 16 splayed main caps have additional material holding the crankshaft in the block. Unlike our competition, GM Performance Parts uses splayed main caps throughout our entire line of performance-built big-blocks. CHEVY BIG-BLOCK V-8 Two-Piece Rear Main

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