CG250 Head - A Closer Look.

[Megadan]

Originally Posted by ben2go

There appears to be plenty of meat in there to hog out on both sides for better flow. Do you think there would be any gains in cutting back the guides so more heat is put into the head and increase flow?

I have never been a fan of cutting back valve guides. I just shave as much as I can around them. The guides themselves don't actually sit in a bad place. Its just the amount of casting around them that eats up so much port space. You could probably cut them back a bit though.

As far as heat into the head goes. A better flowing port, in my experience, makes for a cooler head, port, and valve since the burning exhaust gas exits faster.