VFactor V2.7 (250cc) SBC Cylinder Head
The VFactor 23° SBC Cylinder Heads start with a premium Aerospace Specification A356 (Primary Virgin Ingot) aluminum casting that is semi-finished by Profiler Performance. These castings, originally developed by Darin Morgan with custom head porters in mind, are both light weight and extremely corrosion resistant and feature a solid rocker pad for improved valvetrain stability, and a revised spark plug location to improve flame travel. Utilizing a semi-finished casting allows us the flexibility to offer 5/16”, 11/32” or 8mm valve stem sizes, and standard ductile iron, or Moldstar 90 valve seats depending on the application.
The VFactor 23° v2.70/250cc LBSR is a Large Bore cylinder head. This cylinder head is an excellent option for 421-434 CI engines.
Heads can be purchased bare or fully assembled.
Standard Assembled Package includes:
Ductile Iron Valve Seats
8mm Stainless Steel Pro Valves
PAC 1226 .800" Lift Valve Springs
Wilkes Performance Titanium Retainers
Wilkes Performance Locators and Machined 10* Locks
Hand finishing by Speier Racing Heads is also available for those needing a set custom tailored to their application and combination.
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Flow Numbers
4.155" Fixture
.200 142/113
.300 210/155
.400 263/189
.500 293/212
.600 320/230
.700 332/241
.800 342/248
.900 344/252
1.000 346/254Technical Specs
2.820 sq in Avg CSA
2.700 sq in Minimum Size
5.470" Port Length
250cc Runner
1.320" x 2.300" Opening
2.125" Intake Valve with 33º Back Cut
1.600" Exhaust Valve
64-67cc ChamberGeneral Recommendations
Wilkes Performance assumes no responsibility for damage if the end user builds an engine without properly verifying he has enough piston to valve clearance (depth and radial clearance both checked). It is recommended for a minimum depth of .080″ on the intake valve and .100″ on the exhaust with a radial clearance of .030″ minimum around the perimeter of each valve. It is the customers responsibility to verify proper piston to valve clearance.