These LS3 15deg heads are manufactured from
356-T6 aluminum for reliability and strength.
The 267cc as cast intake ports are very efficient and
flow 346 cfm with 2.165 valves.
67cc hi-flow chambers
2.165 x 1.600 stainless valves with 8mm stems
Hyd Roller springs in the assemblies –
GM Beehive 12713265 .550 lift $1359pr
1.295 Dual .650 lift 140lb @ 1.800 $1395pr
PAC 1.290 Dual .700 lift 150lb @ 1.800 $1439pr
Steel Retainers with Optional Titanium Available
Custom spring & valve combinations are available.