Re: Head is off on 1931 Packard with poor compression

Posted by GaryinSC On 2022/7/12 9:51:22
Certainly if your guy can do an Auburn, he can surely do a Packard as well. I see a lot of slime in the cylinders and assume it is from your attempts to free the valves. I also observe a lot of gunk in the water passages in the block. The water jacket cover needs to be removed and those passages need to be cleaned out. Fortunately when I did my 32 I removed the block since it needed to be bored and sleeved so putting the block in a soak tank for a couple of days cleaned it all out. I would suggest you take a dial caliber to the cylinder bores to see if they are tapered or out of round like mine were. The valves may not need grinding just a good hand lap in with course and fine compound may suffice. I am always leary of grinding if the angles are still true, you only need the middle 1/3 of the faces to match in order to get a good seal. One thing to do before you remove the head studs and that is to measure the length above the deck. I made that mistake and put the new studs in too far and had to remove all of them and start over when there was not enough thread to catch the acorn nuts properly. Also use Indian Head sealant on the threads as the holes go into the water jacket and could leak on full engine heat. I also put my gasket down with copper spray. Some guys do them dry but I always do mine wet especially if you are not going to deck the block and the head. That is something I am always leary of doing too as you need as much metal as you can get even though this is not a pressurized cooling system. Good luck looks like you are in good hands.

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