Description: Add some power to your engine. These GM Performance Parts oval port aluminum cylinder heads are fully machined with semi-finished bronze alloy guides and valve seats that use 2.19 in. intake and 1.88 in. exhaust valves. They feature high-velocity 290cc intake runners to enhance midrange throttle response and torque. The exhaust runner volume is 110cc, which will provide a very streetable(more)

Description: Add some power to your engine. These GM Performance Parts oval port aluminum cylinder heads are fully machined with semi-finished bronze alloy guides and valve seats that use 2.19 in. intake and 1.88 in. exhaust valves. They feature high-velocity 290cc intake runners to enhance midrange throttle response and torque. The exhaust runner volume is 110cc, which will provide a very streetable compression ratio. The valve spring diameter is 1.550 in. with 7/16 in. rocker stud holes. The heads will accept all stock accessory brackets except Gen V, where the bracket holes have been enlarged to 7/16 in. diameters. (minimize)