Speed Works has teamed up with Wilkes Performance to bring you the most powerful heads available. We have a few options you can purchase such as a pair of Stage 1, Stage 2, Stage 3, or Stage 4 LS 706/862 Cathedral casting 5 axis CNC Porting with stainless valves and WP .660 dual race springs with WP titanium retainers. These heads have been disassembled, inspected, cleaned, 5 angle valve job, and milled slightly to clean up the heads. The stages is the size of the valves that you choose. We have option of Stage 1 2.0 intake/1.55 exhaust (stock valves), Stage 2 2.02 intake/1.57 exhaust (stainless valves), Stage 3 2.05 intake/1.57 exhaust (stainless valves), or Stage 4 2.08 intake/1.60 exhaust (stainless valves). The flow numbers above are based off of the Stage 2 setup. We have not yet flowed the other stages we offer. We also offer just a ported casting which means no valves, springs, or anything. Just the casting. We will take core heads on trade-in. If you decided to send in a set of core heads please email us to do so! Please allow 4-6 weeks to machine and assemble!
*****This is for a pair of heads*****
Lift Intake Flow Exhaust Flow .200" 148 cfm 110 cfm .300" 207 cfm 144 cfm .400" 254 cfm 186 cfm .500" 292 cfm 206 cfm .600" 308 cfm 223 cfm .650" 310 cfm 226 cfm
