tcrow1966

I would never, ever port a head this way.

This is called gasket matching and serves a different purpose than port matching, all you are doing if reducing velocity by enlarging the gasket area only. The real problem is in the valve area and to properly port the head you will need to remove the valves in order to de-shroud the valve seats and smooth out the sharp bend on the floor of the ports.

Removing all the casting flash and texture is great, this helps promote swirl which helps atomization. But what's going on here will actually hinder performance.

The only reason to gasket match is if you are building an extremely hi-flow head and are enlarging to ports, intake runners and plenum. Port matching is what is done on a "street port" and is part of the full port and polish job I did on the motor that now resides in the Kakabox. Basically a port match ignores the size and shape of the gasket to some degree and focuses mainly on making sure the ports actually line up when the parts are assembled which helps promote velocity/performance.

Also, a grinding stone is not the proper tool for removing material from aluminum.



Just my $.02