LS7 head capable of making 2000+ HP. Thick casting. Like the 12-4, the 12-5 features extra material on the exhaust flange for additional clamping force.
3/8″-16 exhaust bolt size
CHE Bronze guides.
2.230″ intake and 1.625″ exhaust.
Quench, O-ring, Receiver grooves…this setup can be built to suit your needs. Call us for a full list of additional options and pricing.
**Requires shaft mount rockers