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I'm well into a head rebuild on an N47. Have removed the s/s exhaust liners and have been working the rough casting down in the intakes and exhaust ports and have a pretty good finish in the intakes.
My question is, how important is a bright finish in the ports, intake and exhaust?
I'm also looking for more information about timing chain slack if I do as planned and mill the head .050 to boost compression. Will .050 really be a problem if I don't shim the cam towers?
About the polishing, I have already removed the valve guides so I can get to just about all of the intake surfaces if it is important. How important is it?
How about the valve guide bosses particulatly in the exhaust. They are pretty rough looking. Should these be milled to improve flow?
My question is, how important is a bright finish in the ports, intake and exhaust?
I'm also looking for more information about timing chain slack if I do as planned and mill the head .050 to boost compression. Will .050 really be a problem if I don't shim the cam towers?
About the polishing, I have already removed the valve guides so I can get to just about all of the intake surfaces if it is important. How important is it?
How about the valve guide bosses particulatly in the exhaust. They are pretty rough looking. Should these be milled to improve flow?