Manufactured in Ohio USA the CID GEN V LT1 & LT4 6 Bolt Cylinder Heads are the world’s first aftermarket GEN V LT Cylinder heads. With the CID 6 BOLT GEN V LT heads we set out to address all the underlying problems associated with factory cylinder heads when trying to increase horsepower levels.

Chasing increased HP levels requires increased air flow. This was addressed with the help of Darin Morgan of Reher Morrison Racing. The intake port flows 330CFM @.500” lift with almost 360CFM available @ .800” valve lift through the factory intake valve size and location. Completely redesigned with extra material added to improve the port shape, the intake port retains the factory opening and is only 2cc's bigger in volume than the factory intake port, yet flows over 30CFM more than the factory intake port. The exhaust port flows 215 CFM @ .500” lift through the factory exhaust valve size.

Increased HP levels can require improved head clamping, so we added extra head bolts to not only create the first aftermarket GEN V LT1 head, but the first GEN V LT1 head with 6 head bolts per cylinder.

A robust casting was also on the to do list, so we started with a 25% thicker deck than the factory unit. Next, the water jacket was completely revised to further strengthen the casting, allowing heavier and larger diameter springs, increased rigidity for higher chamber cylinder pressure control, along with increased material around the already modified intake and exhaust ports, that allow for port modifications not possible within a factory casting. Then we cross braised the rocker stands by tying them together with one continuous rocker stand bar that runs the length of the cylinder head, allowing the use of an aftermarket shaft mounted rocker system if required. All heads come with CHE precision bronze valve guides and CHE iron valve seat inserts. Bare heads start at $1998 and include CNC chambers, valve job and CNC bowl blended throats for consistency. Heads come machined to accept all factory rocker gear, valves and springs.