Isn't gasgacinch that stuff like thinned down rubber cement and has cotton ball like applicator on a wire attached to the lid? Red white can....iirc

 

I've installed two 351 kits within the last month. One on a 2009 klx250s and one on a spare 2009 motor I got from ebay (wreck with 200 miles). Grease the threads of the head bolts gives a precise torque. NO gasket sealer required with Bill's new gaskets, cometic. 400 miles on 351 with no issues. Timing took awhile on the first install........easy on the second.

Earl

 

yes..

 

I just sealed the seem at the case halfs and no leaks. Been many miles now.