ffjmoore said:No its not necessary but it is a common place for leaks to develop and I dont really feel like digging back into this motor. so any small thing I can do to increase the odds of never having to do that Ill do. I mean really the tube of sealant is like $7 so its totally worth it. The other leak point is the small rubber o ring on the outside edge between the head and cylinder. There are fixes for that also but are not as cheap or easy.![]()