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Retreat I did....called and changed the order to another set of composite.

Also retreat from Evans coolant I will....I love no corrosion concerns but it has very low surface tension and just leaks.

Could you use a smoke test if it continues to fail the air pressure test?

I tried Evans Coolant for a client and could not get it to stay in the engine at all. 512 BBi and the water pump seal would not hold it in. We abandoned the coolant and have no issues now.

_________________
Wade Williams
Master Ferrari Tech
Restoration Tech
Engine Machinist
Fabricator
Racecar Driver

another dumb question - the end cylinders have to compress the fire rings uniformly to 0535 -what if they can't overcome the fire ring added thickness ?

All fine questions....and I don't really have answers.

Yes in theory some kind of smoke test can be done....if I knew how. The leak is slow so hard to see....the go is probably an HE test with a detector wand or similar to sweep for higher concentrations, don't know.

As for not compressing the flame rings...maybe but the surrounding area is sealing with no coolant dripping out anywhere so I have to believe the flame rings compressed enough to allow the rest of the gasket to seal...but I can't know for sure. There are pressure sensitive films someone recommended to me that maybe could answer this. I also do know the middle cylinders did seal so in theory I could use the pressure film to see when the shims I add to the ends gives me a similar result on the end cylinders to the mid cylinders....maybe?

want to add a few words to last cryptic post.I think the cylinder stickout is a challenging issue here and gasket selection is a big deal . Specifically how much will the fire rings compress ?I am assuming its just an eyelet inserted in the gasket -which is effectively a metal shim once the max compressibility of the gasket has been reached .Since the gasket is 054 at the stud that is probably it .The cylinder liner is 015 plus the fire ring .-looks too high to me .
Just something to think about .............

did not see your post before my last one .If my hypothesis is close to right copper might be better .

that aviation cement did seal some of the cylinders and has apparently sealed the perimeters of the end cylinders -so the film has real merit .

I wonder if you would learn anything by cutting out small sections of the old gasket with a hole punch or drill and stick in a small pieces of Plastigauge and retorque the heads and remove them and see the results in different areas?

and one more point -the cylinder flange could be acting as a fulcrum and bowing head between the head studs .That's all I got -back to read mode