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vince1 · 12-29-2019, 05:29 PM

I did it to a 6 cyl 280 Mercedes with full shop air on it and it cracked the aluminum head. I think they had the compressor cranked all the way up to 180 psi. After bolting on a head from a different engine and finding no compression because the heads were different, I had the first one welded and all was good. Lots of people have told me that would be impossible but I heard it pop and knew I had a problem. That was probably more than 35 years ago.

12-29-2019, 05:29 PM	#11
vince1 Registered User Join Date: Jan 2013 Location: Calgary Alberta Posts: 1,164	Re: Are valve guide umbrellas really needed? I did it to a 6 cyl 280 Mercedes with full shop air on it and it cracked the aluminum head. I think they had the compressor cranked all the way up to 180 psi. After bolting on a head from a different engine and finding no compression because the heads were different, I had the first one welded and all was good. Lots of people have told me that would be impossible but I heard it pop and knew I had a problem. That was probably more than 35 years ago. Last edited by vince1; 12-29-2019 at 05:43 PM.