Page 212 of GM Performance Parts 2006 Catalog by GM Parts Direct

DRCE 3 Aluminum Cylinder Head Casting (exhaust) A DRCE 3 Aluminum Cylinder Head Casting (combustion chamber) A DRCE PRO STOCK HEADS Six-time NHRA Pro Stock world champion, Warren The Professor Johnson, runs DRCE, why dont you? GM Performance DRCE 2 aluminum cylinder head was specifically designed for DRCE 2 block P/N 24502572 and intended for NHRA Drag Racing Pro Stock competition applications. Complies with rule for 500 cubic inch engines with 4.900" cylinder bore spacing. Special features include: high capacity water jackets, symmetrical port layout, ample wall material for custom porting, thick deck surface (7/8") to facilitate angle milling, and reduced weight casting to minimize CNC machine time. Typical CNC-prepared head without valves or valve train weighs approximately 40 pounds. DRCE Pro Stock Race Head Technical Notes: 357-T6 Aluminum 7/8" thick decks allow for angle milling or heavy flat milling High capacity self-purging water jackets Symmetrical intake port layout Intake and exhaust ports are extremely small peanut ports Requires professional porting and machining Complies with NHRA Pro Stock 500 CID, 4.900" bore spacing rules Custom, aftermarket rocker arm assemblies required 24502585 DRCE 2 Raw Aluminum Cylinder Head (not shown) Raw aluminum casting, not machined Accommodates 10-14 x 5 intake and 5-9 x 2.5 exhaust valve angles Raw casting, not machined Made to work on DRCE 2 block P/N 24502572 A. 25534404 DRCE 3 Aluminum Cylinder Head Casting Raw aluminum casting, not machined Newest design DRCE rocker arm mounting pads and valve spring seat pads allow greater flexibility with valve angles and locations than DRCE 2 Made to work on DRCE 3 block P/N 25534403 DRCE 2 P/N 24502572 25534405 Semi-Finished DRCE 3 Aluminum Cylinder Head (not shown) Starts out as un-machined head 25534404 Deck, end faces, and valve cover rail with taped mounting holes are machined Tapped water jacket access holes provide opportunity to plumb water near exhaust ports Head includes eight #8 A/N plugs and one #16 A/N plug 25534387 DRCE 3 Water Jacket Plug (not shown) Plug for ends of DRCE 3 cylinder head casting P/N 25534404. Plug is aluminum #16 A/N with internal hex for Allen wrench. Includes O-ring. Sold individually. Use two per head. 25534388 DRCE 3 Water Jacket Plug (not shown) Plug for water jacket access holes of DRCE 3 cylinder head casting P/N 25534404. Plug is aluminum #8 A/N with internal hex for Allen wrench. Includes O-ring. Sold individually. Use eight per head. DRCE 3 Aluminum Cylinder Head Casting (intake) A 210 CHEVY BIG-BLOCK V-8

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