Shaving head, intake, exhaust


Aug 17, 2019
Ok so I've shaved the head a bit and ended up increasing compression. I read somewhere that you can shave some of the exhaust port to increase top end performance?

Is this true? If so how do I go about this. I've already dremeled the intake manifold so it's the exact same size as the port. It was about 5mm larger, now it's nice and tight.

I use gasket maker on all the areas that need sealing so I know for sure there's no air leaks and such.

Let me know what you guys think


Well-Known Member
Nov 27, 2012
It's not shaving the exhaust port. It's porting the exhaust port. Making it larger. Around 24mms wide and raising it to where it is 4 to 5 mms higher than the transfers at the top. Measure to top of transfer, zero your caliper at that measurement, mark top of exhaust with marker, move caliper till it says -4mm and lock it there, Scrib a line in the marker with the caliper, Remove material to scribed line.
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