Speed Works has teamed up with Wilkes Performance to bring you a pair of LS3 Aftermarket Casting Stage 2 Porting with 2.165/1.59 or 2.180/1.60 black lightning race valves and .660 dual race springs with WP steel or titanium retainers. These heads are brand new Wilkes Performance castings that have had a 5 angle valve job, and milled slightly to clean up the heads. 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*****
283cc Intake runner/ 94cc Exhaust/ 68cc Chamber
Lift Intake Flow Exhaust Flow .200" 154 cfm 115 cfm .300" 224 cfm 170 cfm .400" 282 cfm 200 cfm .500" 323 cfm 212 cfm .600" 352 cfm 233 cfm .650" 359 cfm 237 cfm