Cylinder Head Porting

We port cylinder heads with the following features:

The intake ports are opened up from 33 to 36 mm for an increase in port volume of 19%.

The exhaust ports are opened up from 30 to 33 mm.

The valves are unshrouded. The intake valve seats are blended into the roof of the combustion chamber.

The valve seats receive a three angle finish. The '90 - '92 intake valves are back-cut. '93 - '95 valves were back-cut at the factory.

The dyno chart shows the incremental power increase from the addition of cylinder head porting on an engine with top end porting. The subject engine is a '93 that also has headers. Note that low speed torque is maintained.

The cylinder head porting process includes; removal of the engine, disassembly of the top of the engine, porting, combustion chamber work, refinish the valves and seats, time the camshafts to I114/E110 +/- .5 degree, reassembly of the top of the engine, reinstallation of the engine in the car, and Dynojet tuning. $6798.