Vacuum checking your valve sealing before a head install

[1990TSIAWDTALON]

I made a vacuum testing rig to check the sealing on valves of various cylinder heads so I want to share it with the group. This one will check 4g63 heads and I checked it on an LS Chevy head and it will work on those too so I figure it will work, as I made it, on most heads. I included a list of all of the parts used and links to them in the video comments section. I got the idea from another 4G63 fan and my setup is very similar to his.
Here it is, I hope it is helpful!
Marty

NOTE - After relapping the 4 valves in the "LOW" vacuum cylinder, it also held over 25hg.

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[danl]

It’s also a good idea to check again with the head fully loaded with cams, hla’s, etc. That way you can verify the valve stem height isn’t to long, keeping some valves cracked open a few thousandths of an inch. Then you need to decide if you want to pull the head to send it back to the machine shop who didn’t do the work correctly the first time around or if you just want to hit the base of the hla’s with a flap wheel and send it.

 

[1990TSIAWDTALON]

Yeah, it wouldn't take more than 5 to 10 minutes MAX, to check again, once you have the head built,.I mean, you might as well.
I didn't, but I KNEW all was good before the Kiggly Springs went on. Always good for peace of mind.