Page 152 of GM Performance Parts 2006 Catalog by GM Parts Direct

Splayed-Valve (intake) A Splayed-Valve (exhaust) A Splayed Valve ROX (exhaust) B 150 Splayed-Valve (combustion chamber) A SPLAYED-VALVE ALUMINUM RACE HEAD 4 Departing from the in-line valve head, our splayed-valve castings have a 0.240" minimum port wall thickness so your favorite head porting expert can perform extensive modifications for greater airflow. Intake valves are angled 16 to the deck surface and tilted (splayed) 4 . Exhaust valve angles are 11 , with a 4 tilt. This is an extremely aggressive, all-out competition race head designed to make the absolute maximum power from your small-block Chevy with no regard to streetability. Our NHRA Competition Eliminator customers routinely make over 1000 horsepower (naturally aspirated) with this cylinder head! Aluminum Splayed Valve Race Head Technical Notes: 355-T7 Aluminum Competition cylinder heads No seats or guides Extra thick decks for angle milling or heavy flat milling 45 cc as-cast combustion chambers .240" Extra material around ports for professional porting Revised location angled spark plugs, (14 mm, 5/8" hex, 3/4" reach, gasketed plugs) Completely revised intake exhaust ports offer the ultimate in airflow potential Designed for longer than stock 2.20" 1.65" valves Modified valve angles, 16 x 4 intake, and 11 x 4 exhaust Valve Spring pads accommodate 1.625" diameter valve springs All pistons have same orientation Designed for aftermarket shaft-mount rocker systems Valve Cover P/N 10185045 and valve cover gaskets P/N 10185043 required P/N 10185042 intake manifold gasket required Custom fabricated intake manifold required 12480146 Rough-Machined Splayed-Valve Aluminum Cylinder Head Main surfaces are machined, exhaust bolt pattern is machined Head bolt dowel holes, intake bolt holes, spark plug holes pushrod holes are not machined Valve guides valve seats, valve spring seats rocker stands are not machined Valve locations and angles may be relocated 240 cc as-cast intake ports 78 cc as-cast exhaust ports 45 cc as-cast combustion chambers 12480147 Semi-Machined Splayed-Valve Aluminum Cylinder Head Main surfaces are machined, exhaust bolt pattern, valve guides and spark plug holes are machined Head bolt holes, dowel holes, intake bolt holes, pushrod holes are not machined Valve seats, spring seats rocker stands are not machined 240 cc as-cast intake ports 78 cc as-cast exhaust ports 45 cc as-cast combustion chambers Same casting as P/N 12480146 A. 24502517 Splayed-Valve Aluminum Cylinder Head Semi-machined aluminum race head 240 cc as-cast intake ports 78 cc as-cast exhaust ports 45 cc as-cast combustion chambers Same casting as P/N 12480146 B. 12480153 NEW Splayed-Valve R0X Aluminum Cylinder Head Semi-machined aluminum race head Great for NHRA competition with dual carburetors As cast ports and combustion chambers for professional finishing Machined for 4.500" bore center R0X cylinder block P/N 25534352 Special larger head-bolt pattern, 3/8" fasteners, 19 holes 240 cc as-cast Peanut intake ports 78 cc as-cast Peanut exhaust ports 40 cc as-cast combustion chambers 4Splayed valves point the intake and exhaust valves at the center of the cylinder bore. As the valves open, they move away from the edges of the cylinder bore, allowing a larger valve to be installed in the same bore size while dramatically increasing airflow. Splayed Valve ROX (intake) B Splayed Valve ROX (combustion chamber) B CHEVY SMALL-BLOCK V-8 NEW NEW NEW

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