317 LS Heads Fully CNC Ported w/ Stainless Valves and .660 Springs Pair

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CNC ported GM 317 Castings 228cc intake runner, 84cc exhaust 72cc chambers sold in pairs Speed Works has teamed up with Wilkes Performance to bring you some really nice 317 heads! We have sold and tested tons of these heads. Flow numbers are posted below. These heads are 5th axis CNC ported with Race Stainless valves, titanium retainers, .660 dual race springs! All heads are disassembled, cleaned, inspected, and had a 5 angle valve job done! These heads will be ready to bolt on.  *****NOTE THESE TAKE 2-3 WEEKS TO BUILD****  WE CUSTOM BUILD EVERY HEAD AND TEST THEM BEFORE THEY LEAVE OUR FACILITY!  SOMETIMES WE CAN GET THESE OUT SOONER!  Flow Data: .200 148 Intake 115 Exhaust .300 208 Intake 153 Exhaust .400 256 Intake 193 Exhaust .500 293 Intake 205 Exhaust .600 314 Intake 221 Exhaust .650 317 Intake 225 Exhaust