polishing out CNC gouges/cuts?
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Joined: Aug 2002
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From: Hartsdale, NY
polishing out CNC gouges/cuts? I bought some CNC ported heads that are fully assembled with valves and springs ...they are not polished, however, and there are some deep gouges where the CNC machine made porting cuts.
These are present in the intake and exhaust ports, and also the chamber.
Question: Since I would rather not install these as is, what is the best way to remove the cuts and polish the ports/chambers?
Is this a job for a speed shop or should I do it?
Maybe I will leave the two ports as is and just polish the CNC marks from the chambers...
Any thoughts?
These are present in the intake and exhaust ports, and also the chamber.
Question: Since I would rather not install these as is, what is the best way to remove the cuts and polish the ports/chambers?
Is this a job for a speed shop or should I do it?
Maybe I will leave the two ports as is and just polish the CNC marks from the chambers...
Any thoughts?
Re: polishing out CNC gouges/cuts? I took my CNC GMPP heads to West Coast Racing Heads, in Reseda, California.
Richard Reyman, the owner, was very familar with these heads and suggested a "cleanup" of the sharp edges in the CC. I left the CNC machining alone, as Richard thought these were fine.
Richard deburred, disassembled, cold washed, check spring height and pressure, reassembled etc.
Heads now look "finished" and are ready for install!
A thumbs up to West Coast Racing Heads, quick turnaround, very fair price for my job, answered all of my goofy questions and drives a nice 00 SS w/a TR 220/112 with his heads of course!
Richard Reyman, the owner, was very familar with these heads and suggested a "cleanup" of the sharp edges in the CC. I left the CNC machining alone, as Richard thought these were fine.
Richard deburred, disassembled, cold washed, check spring height and pressure, reassembled etc.
Heads now look "finished" and are ready for install!
A thumbs up to West Coast Racing Heads, quick turnaround, very fair price for my job, answered all of my goofy questions and drives a nice 00 SS w/a TR 220/112 with his heads of course!
Re: polishing out CNC gouges/cuts? The only part's that you will benefit from are the intake & exhaust runner's..the floor/roof/and wall's you can leave alone..just cartrige roll blend the intake bowl's,short side radious, and port entry..on the exhaust side..cartrige roll blend the bowl's,short side,roof/guides,and port exit..then follow up with cross buff's in sequence from fine to very fine...flap wheel's could be used also..but i dont reccomend them...maybe for the chamber's..but that's about it..UNLESS you feel confident enough to use them in the bowl's near the seat's..if you do..go cartrige roll,flap wheel, then cross buff's..depending on how bad the cut's are..you can see anywhere from 5 to about 9 cfm increase..possibly more depending on how deep and course the cut marks are.I would leave the chamber's alone unless there are seriously sharp cut's..USE OLD VALVES in the chamber if you decide to clean them up...good luck <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
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