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SSDiv6 · 03-26-2016, 06:29 PM

The cylinder heads are CNC ported as shipped by GM and they are part number 17802818.
They feature:
• 12 Degree Valve Angle
• 2.205" titanium intake valves
• 1.615" sodium-filled exhaust valves
• Max-Life Beehive-type valve springs
• Valve retainers and locks
• Intake and exhaust stem seals
• Intake lash cap
• 275cc Intake Port
• 90cc Exhaust

There is also another version of the 427 COPO engine used for Factory Stock that runs the LSX-DR cylinder head engine with larger valves and a 313 cc intake port and 110cc exhaust port. This cylinder heads run a CFE designed intake manifold with a Holey Dominator sized throttle body.

http://www.chevyhardcore.com/news/ne...take-approved/

There is another similar article on an LS3, 396 CID LS engine built by Patterson.

http://www.enginelabs.com/engine-tec...-stock-racing/

03-26-2016, 06:29 PM	#19
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 3,044 Likes: 712 Liked 1,582 Times in 582 Posts	Re: Within Stock rules??? The cylinder heads are CNC ported as shipped by GM and they are part number 17802818. They feature: • 12 Degree Valve Angle • 2.205" titanium intake valves • 1.615" sodium-filled exhaust valves • Max-Life Beehive-type valve springs • Valve retainers and locks • Intake and exhaust stem seals • Intake lash cap • 275cc Intake Port • 90cc Exhaust There is also another version of the 427 COPO engine used for Factory Stock that runs the LSX-DR cylinder head engine with larger valves and a 313 cc intake port and 110cc exhaust port. This cylinder heads run a CFE designed intake manifold with a Holey Dominator sized throttle body. http://www.chevyhardcore.com/news/ne...take-approved/ There is another similar article on an LS3, 396 CID LS engine built by Patterson. http://www.enginelabs.com/engine-tec...-stock-racing/