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I know it was mentioned that 'The right Stuff' and some RTV's were ok to seal the water jacket holes. I went to NAPA yesterday to buy the right stuff but was not in the mood to pay $21 for the small tube of it.



1. It really is worth it
2. Stop being cheap.

I used Yamabond on the first 2 Cometic installs I've done, both with fresh aluminum heads. 1st one was sloppy, but it didn't leak (on a BB). Second one was neater but it leaked (on a SB). I'm... not going to be using that stuff again, it's really nasty to work with and hard to apply properly. The time it takes to properly apply it to all 4 surfaces of the head, gasket and block causes it to dry significantly in my experience. It's like working with a runny salt-water taffy .

Props to all that use it successfully, too much of a pain for me though .