What happens when you combine two lifetimes of cylinder head research and development? The BTR CV cylinder head for LS! When you have a cylinder head casting legend like Rick Smith on board (Father of the Hi-Port, A460, Twisted Wedge and more!) and decades of Brian Tooley's porting & cylinder head flow bench experience, you end up with serious game-changing performance!

This cylinder head ships partially machined with finished valve guides and unfinished valve seats installed for cylinder head porters to customize for their application. Valves, springs & valve spring hardware are not included. Final port sizing, chamber sizing, decking and other parameters are at the cylinder head builders’ discretion.

INSTALLATION NOTES – These are porter’s castings and are not intended for out of box use. Extra material (.100”+)  will need to be removed from chambers and runners to final port & chamber shape. Finished deck milling will be required. Valve seat cutting & finishing required. Uses LS1 rocker bolts. M10x1.5 Accessory hole commonly used for dipstick is shallower than OEM to prevent water jacket intrusion; please check your dipstick bolt prior to final assembly. Like many aftermarket heads, a sealant will be required on intake rocker bolt threads that intersect the port. ALWAYS VERIFY NEVER ASSUME all engine clearances before final assembly.

BTR-CVH3P-6U Cvh LS3 6 Bolt Porters Casting Features:

• BTR-exclusive canted-valve design allows for maximum valve unshrouding and sizing – Cathedral-style fits a 3.780 in. bore, LS3-style fits a 3.820 in. bore
• 11° Intake (5° canted) and 13° exhaust (3° canted)
• Cast in Iowa – Designed, tested, machined, and sold in Kentucky
• Intake flow exceeds 360 CFM at .650 in. lift when used with BTR's port program
• Uses OEM LT1 2.125 in. steel hollow-stem intake valves and 1.590 in. steel exhaust valves
• LT4 titanium intake and L8T Inconel™ exhaust valves can also be used with lash caps
• Superior OEM-type powdered metal guides
• Utilizes OEM-style straight LS1 pedestal rockers, OEM-style intake and exhaust manifolds, and LS-style valve covers
• Uses Gen V LT-style long-reach spark plugs and valve spring kits up to 1.350 in. O.D.
• Clears 3/8 in. pushrods – Typical intake length: 7.925-8.025 in.; typical exhaust length: 7.900-8.000 in.
• Extra-thick .750 in. boost-friendly deck in a popular 6-bolt configuration

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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