The SFactor 23° v2.35/205cc SBSR is a dedicated Small Bore cylinder head. This is the perfect head for 4.060" bore, 389 CI and smaller builds. Take advantage of one of the only dedicated small bore offerings in the industry!
Heads can be purchased bare or fully assembled.
4.060" Fixture .200 134/108
.300 198/139
.400 242/172
.500 275/190
.600 287/206
.700 294/220
.800 301/229
.900 307/233
1.000 310/236
2.350 sq in Avg CSA
2.300 sq in Minimum Size
5.330" Port Length
205cc Runner
1.320" x 2.230" Opening
2.055" Intake Valve with 33º Back Cut
1.600" Exhaust Valve
64cc Chamber
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