The BTR Canted Valve LS Cylinder Head (BTR-CVH1C-6A) is sold individually and ships fully machined and CNC ported, with finished valve guides and seats installed. OEM LT1-type valves are installed to the correct height with BTR's .660in lift Platinum spring kit, ready for a stock-type LS1 rocker arm setup.
BTR's canted-valve design allows maximum valve unshrouding and sizing, with an 11 degree intake (5 degrees canted) and 13 degree exhaust (3 degrees canted). The LS1-style port is finished to 250cc and the chamber to 63cc, and BTR reports over 360 CFM of intake flow at .650in lift with its port program. The casting is poured in Iowa and the head is designed, tested, machined and sold in Kentucky.
- Part Number: BTR-CVH1C-6A
- Application: GM LS1 cathedral-port style, fits a 3.780in bore
- Configuration: CNC ported and fully assembled, sold individually
- Deck: Extra-thick .750in boost-friendly deck, 6-bolt configuration
- Valve Angle: 11 degree intake (5 degrees canted), 13 degree exhaust (3 degrees canted)
- Port Volume: LS1-style port finished to 250cc
- Chamber Volume: 63cc
- Intake Flow: Over 360 CFM at .650in lift with BTR's port program
- Valves: OEM LT1 2.125in steel hollow-stem intake and 1.590in steel exhaust; LT4 Ti intake and L8T Inconel exhaust valves can also be used with lash caps
- Valve Springs: BTR .660in lift Platinum spring kit installed; accepts valve spring kits up to 1.350in OD
- Valve Guides: OEM-type powdered metal guides
- Rocker Arms: OEM-style straight LS1 pedestal rockers, uses LS1 rocker bolts
- Compatibility: OEM-style intake and exhaust manifolds, LS-style valve covers
- Spark Plugs: Gen V LT-style long-reach spark plugs
- Pushrods: Clears 3/8in pushrods; typical length intake 7.925-8.025in, exhaust 7.900-8.000in
- Pistons: BTR/Wiseco canted-valve-specific pistons available for most popular LS applications
Installation Notes
This head uses LS1 rocker bolts. The M10x1.5 accessory hole commonly used for a dipstick is shallower than OEM to prevent water jacket intrusion, so check the dipstick bolt prior to final assembly. As with many aftermarket heads, a sealant is required on intake rocker bolt threads that intersect the port. Always verify all engine clearances before final assembly.
FAQ
Is the BTR-CVH1C-6A ready to bolt on?
Yes. It ships fully machined and CNC ported with guides, seats, OEM LT1-type valves and BTR's .660in lift Platinum spring kit installed, ready for a stock-type LS1 rocker arm setup. All engine clearances should still be verified before final assembly.
What bore size does this cylinder head fit?
This LS1 cathedral-style canted-valve head fits a 3.780in bore. BTR's LS3-style version is designed for a 3.820in bore.
What are the port and chamber volumes?
The LS1-style intake port is finished to 250cc and the combustion chamber to 63cc, with over 360 CFM of intake flow at .650in lift reported using BTR's port program.
What pushrod length does this head typically need?
It clears 3/8in pushrods, with a typical intake length of 7.925-8.025in and exhaust length of 7.900-8.000in. Final length should be measured for each build.
Are there installation notes to check?
Yes. It uses LS1 rocker bolts, sealant is required on intake rocker bolt threads that intersect the port, and the M10x1.5 accessory hole commonly used for a dipstick is shallower than OEM to prevent water jacket intrusion, so check the dipstick bolt before final assembly.
