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 combustion chamber shape is modified to work in conjunction the increased port flow.

The valve seats receive a three angle finish.

The dyno chart shows the incremental power increase from the application 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, reassembly of the top of the engine, reinstallation of the engine, and Dynojet tuning. $4965

 

'90 cylinder heads can be upgraded to include valve stem seals on the exhaust valves. $150

Top end porting is a prerequisite. The cost, combined with top end porting. $7250