Corvair Forum

I would first contact Clarks for a replacement if you feel the part is defective. If you just want to experiment, you might try heating the plastic gently and then compress it slightly around a square stick sized to simulate the speedo drive cable end. Also make sure the cable is not too tight in t...

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I was installing weaker springs to measure pushrods, when I put compressed air to hold valves closed there was air leaking out intake and exhaust not much but I would expect that if the valves were seating properly there should be no leaks so back to shop they went. Both heads got relapped, again s...

I was installing weaker springs to measure pushrods, when I put compressed air to hold valves closed there was air leaking out intake and exhaust not much but I would expect that if the valves were seating properly there should be no leaks so back to shop they went. Both heads got relapped, again sa...

Heads went back to the shop. I'll let y'all know what the problem was. Sent from my [device_name] using Corvair Forum mobile app Heads came back, mineral spirits leak down revealed a few leaks, not sure what went wrong. Found a leak down gauge. #1 @ 20% others around 13% I'm going to go ahead and r...

Heads went back to the shop. I'll let y'all know what the problem was.

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I'm not sure what is meant by a "valve job. In the old days it was just lapping the valves and seats. Anything short of new deep valve seats, new valves, and new guides is not acceptable on these old 140HP heads. Worn valve guides will result in poor valve seating due to alignment problems. Th...

I'm not sure what is meant by a "valve job. In the old days it was just lapping the valves and seats. Anything short of new deep valve seats, new valves, and new guides is not acceptable on these old 140HP heads. Worn valve guides will result in poor valve seating due to alignment problems. Th...

From Clark's, used heads, everything is new, only have half the engine reassembled so far away, and only one pair of springs was removed. I'm using Otto performance springs. Not sure what a leak down test is. I put some air in to hold valves closed to do the spring change for the pushrod length calc...

In my defense and not to be a Richard Cranium I did say all all I did was install "weak" springs, don't have pushrods yet

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Now Jerry's reply makes sense to me

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Is it possible in your new setup that somehow every valve adjustment is too tight — causing all valves to remain open slightly even at the bottom of the cam lobe? Not necessarily a leaky valve and seat but a valve that is not closing completely. :dontknow: I have no push rods installed yet I guess ...

Something odd is going on. I can't believe every valve and seat in both heads has an issue.

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OT-10 cam Roller rockers Hydraulic lifters .052 head gaskets .015 base gaskets Stock 140hp heads Yes hold closed, ty for the correction All that is irrelevant, the question is how can they be leaking air both intake and exhaust on all cylinders of both heads. I could see it if I had done a half ass ...

Sorry about the typos and lack of punctuation

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Was determining pushrod length today and when I pressurized the cylinder with air to hold the valves open while I installed the check Springs I think they're called I noticed leakage out the exhaust tube called my machine assist he said bring them back and he went through and resurface the seats and...