Pin holes in the head sealing surface..., Can I run as-is, or should they be welded up? |
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Pin holes in the head sealing surface..., Can I run as-is, or should they be welded up? |
jhadler |
May 15 2009, 11:21 AM
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#1
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Long term tinkerer... Group: Members Posts: 1,879 Joined: 7-April 03 From: Lyons, CO Member No.: 529 |
Hey all,
The motor is going back together, and upon close inspection of the heads, there are some small pinholes along the sealing surface of the head. I'd like to drop the head gasket and lap the cylinder to the head, but will these holes be a problem? Based on the measurements, the pinholes will be 0.016" outside of the ID of the jug, and as such, covered by the jug. But is that enough? Can I run this as-is? Lap the jugs to the heads, and run sans gasket? Should I run I gasket? Or should I have the holes welded up and re-flycut the heads? There's all of about 40 minutes run time on these heads right now. Thoughts? Experience? Thanks! -Josh2 |
jhadler |
May 20 2009, 03:51 PM
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#2
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Long term tinkerer... Group: Members Posts: 1,879 Joined: 7-April 03 From: Lyons, CO Member No.: 529 |
I spoke with the fellow who did the heads. He recommends a gasket, or copper fire ring, and doesn't think that it'll be a problem at that point.
He also suggested the following: 0.010 - 0.012" deck height per inch of bore. Which works out to 0.037 - 0.045 dech height. additionally, he suggested 0.100 to 0.120 clearance to exhaust valve at TDC. (squished clay measurement). Do these things sound good to you all? He's a good builder, and I have no reason to doubt his experience, but would like to hear opinions from the experienced engine builders here... Thanks, -Josh2 |
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