MTI Racing #253 LS3 Aluminum Engine 808hp & 738 ft/lb of Torque C7 They are not just for

They are not just for "highly-modified engines"

Valve Stem Diameter              8mm

A particular head with slightly lower numbers may end up making MORE POWER due to the quality and direction of airflow

Just like every chassis dyno will report your car at different power levels

This piece not only is stronger than the original oem roof panel but weights a fraction of the oem weight

MTI Racing #253 LS3 Aluminum Engine 808hp & 738 ft/lb of Torque C7 They are not just forMTI Racing #253 LS3 Aluminum Engine 808hp & 738 ft lb of torque Complete Engine ONLY Engine Build Sheet and Engine Dyno Sheet Attached Complete Engine includes: Water Pump Pulley, Power Steering Pulley, Throttle Body, Alternator Bracket, Tensioner, Coil Pack, Coil Pack Wiring, Spark Plugs and Spark Plug Wiring, Intake Manifold, Fuel Rails, Fuel Injectors.