coolant leak update

okay, went out and cleaned up the heads where the intake mounts and as I was cleaning up using the vacuum and getting the stuffed paper towels out (great tip!) I passed the vacuum over the hole in the new picture and it started sucking coolant. When I started the cleaning process there was silicone partially stuffed in there and part stuck to the manifold when I took it off. Am I correct the the Cleveland has coolant in the heads but not in the intake?

quote:

Am I correct the the Cleveland has coolant in the heads but not in the intake?

Correct.

I seem to recall a post somewhere by Dan Jones or Kelly Colefield explaining that the cooling passage to bolt hole is a very thin casting that can crack or rust through and allow coolant escape. Not sure what the fix was, maybe just some silcone sealant on the bolt.

Either that or maybe your heads have been drilled for use on a Clevor engine with a coolant flow intake at some point?

quote:

your heads have been drilled

I believe so.

You have several additional holes in comparison to my stock heads. I'm pretty sure only one of those holes is going to have threads in it.

The only holes the Cleveland needs are for the intake bolts. They are in pretty much a straight line across the head.

This photo is of the same area of your photo.

The entire head to intake manifold bolt pattern

they have been like that for about 5 years since the rebuild... I guess I will resilicone those holes and see what happens.

thanks for the replies big help as always

gary #06984

Not only do have a few "extra" holes, but your intake ports are a very unusual shape. Not oval, but squared off at the bottom. I wonder what that is about? Looking at your "before" picture with the old gasket, you can see the gasket does match up at all. In your latest picture the raised square bottom of the port is very visible. Hmmmm.... Is it even a Cleveland head?

far as I know they are Cleveland heads, They have been on the car since my motor was rebuilt about 6 years ago, the "squared off" part on the bottom are the MPG port plates www.mgpheads.com. Unfortunately I had to replace my heads when we did the rebuild. The machine shop who did them was highly recommended, and even more unfortunately, I can't ask him since he passed away about a year ago.

I'm no expert on this but could these heads have been modified to to use on a Windsor block to create a "Cleavor"? The large holes would correspond with the Windsor intake manifold water passage.

Jim Cain
#5774