Big port head flow tuning

[oldeskewltoy]

A few weeks back I did a bit of porting... MILD porting!. Here is the work I just did....

Raw, unworked ports on left........................................................ blended ports on the right








Now besides cleaning and blending around the valve seat, the exhaust ports are usually rather rough. Here again, blending is the call.
This time finished ports are below raw ones




Finally, for a street port, blending and doing mild shaping to the exhaust port as it approaches the manifold. Not BIGGER, but shped to allow the flow out as easy a path as possible


The above photos are of one exhaust port, each view focuses on one valve.

*IF* you are unsure of what to do... doing nothing is superior to a bad porting job