Tin/composite gaskets for head job

Barten

Barten

Active Member
I am rebulding an approx. 1981 SD1 engine for my 1972 3500S. I intend to use tin head gaskets because the CR on this engine is already as low as 9:35, but have planned to use a composite valley gasket. Is there any special problems with that? Maybe the intake openings have to be trimmed slightly not to act as a barrier for the gas? Has anyone done this with success?
regards, Barten
 
Hello Barten,

The composite valley gasket is thicker, so if anything the bolt holes in the inlet manifold may not align as they should with their respective head counterparts.

Did you have a particular reason for wishing to use a composite valley gasket?

Ron.
 
Looking at the state of the old valley gasket, I think a composite gasket will do a better job. The old one was rusted and leaking in several places. If I have to stick to the tin valley gasket, is it advisable to use some kind of sealer to prevent these problems?

regards, Barten
 
I have to say that I've never had problems with tin inlet gaskets if they're correctly fitted, and I wouldn't mix composite with tin on the same engine, either use one type or the other IMHO.
 
Hello Barten,

You will need to apply a suitable sealant on the corners of each cylinder head, on the gasket and on the manifold. In addition you must apply the sealant around the water passages. Either Hylomar sealing compound 32M can be used,....which is still recommended by LR to this day or your favourite silicon sealant. I used the latter when I did my engine in 1997 with no ill effects, and my 4.6 which was built in 2007 used the former.

Ron.
 
You must log in or register to reply here.
Back
Top