317 LS CNC Ported Heads
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317 LS CNC Ported Heads


SKU: wp-317 Category:

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 317 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
Valve Options

No Valves, Stage 1 2.0/1.55 Stock Valves, Stage 2 2.02/1.57 Stainless Valves, Stage 3 2.05/1.57 Stainless Valves, Stage 4 2.08/1.60 Stainless Valves

Spring Options

No Springs, .570 Lift LS6 Blue BeeHive, .660 Dual Spring Kit w/ Steel Retainers, .660 Dual Spring Kit w/ Titanium Retainers

Milling Option

Surface Mill (Clean-Up Only), Mill .005, Mill .010, Mill .015, Mill .020