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Tuesday, March 31, 2009

Valve seats and stem clearance measurements

Ground the valve seats in my open sky shop. Intake width .060 exhaust .080. Tried to get the intake pattern towards the outside of the valve face and exhausts in the middle.
Stem clearance checking. This is the best I've got to use. A magnetic mount and dial indicator set on the stem as close to the guide bore as possible and as square as possible.
One exhaust was a little tight and on inspection there was a burr in the bore. A quick trip with the hone cleaned that up. The goal was .001 on intakes and .0025 on exhaust. With his setup's limitations I think it is real close to that.

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