The IAG 1150 CNC Ported Drag Cylinder Heads are designed for drag racing and competition. These fully CNC ported heads provide a significant upgrade in long term performance over the IAG 950 heads. These heads work great for cars where getting the most power with maximum reliability is the goal. The IAG 1150 heads are the best heads available for high-horsepower drag racing. They are designed to support up to 1150 BHP with supporting mods. These heads include upgraded Ferrea Valves, GSC Viton Valve Stem Seals, Upgraded GSC Valve Guides, Ferrea Dual Drag Valve Springs with Titanium Retainers, and Ferrea Keepers. GSC S2 or S3 Camshafts are available with OEM valve lifter buckets. We also offer an optional chamber modification service (see below) for EJ20 heads to allow use on EJ25 short blocks. Each IAG 1150 Cylinder Head Set starts with new OEM castings from Subaru of America. The first step is to select your Year and Model of vehicle so that we may provide you with the right castings to fit your project. Next, you'll select whether or not you want to include our optional GSC camshaft package. If selected, these heads will include new GSC S2 or S3 Camshafts and OEM Lifter Buckets for valve adjustment.

IAG 1150 CNC Ported Drag Cylinder Heads Package Includes: (x2) Brand New Subaru OEM Cylinder Head Castings, (x8) Ferrea 37mm (+1mm) Comp Plus Intake Valves, (x8) Ferrea 33mm (+1mm) Comp Plus Exhaust Valves, (x16) Ferrea Dual Drag Valve Springs & Titanium Retainers, (x16) GSC Manganese Bronze Valve Guides, (x8) GSC 6mm Intake Valve Stem Seals, (x8) GSC 6mm Exhaust Valve Stem Seals, (x16) OEM Lifter Buckets, IAG Performance CNC Porting, Multi-Angle Valve Job, Drilling for compatibility with ½" or 14mm Head Studs, Machined Cam Lobe Clearance, Resurface, Ultrasonic Cleaning. Optional Camshaft Package Also Includes: GSC S2 Camshafts, (x16) OEM Lifter Buckets, Bench Valve Lash Service (Final Lash Should be Checked and Adjusted Once Heads are Installed).
,For use with larger cams such as GSC S2.
,Assembly and professional installation recommended.
,Workmanship/parts warranty will only be available for professionally installed cylinder heads.