Surface finish on heads?

[Mdub707]

I know everyone talks about how important the flatness of the heads/block are for gasket prep, and the minimum thickness required on the head, but what about surface finish? Is there a spec for this at all? If not, what is a good machine shop practice on a part like this?

 

[golfer]

I know everyone talks about how important the flatness of the heads/block are for gasket prep, and the minimum thickness required on the head, but what about surface finish? Is there a spec for this at all? If not, what is a good machine shop practice on a part like this?

50Ra or finer is the surface finish we recommend with the MLS gaskets

 

[Mdub707]

Thanks!

 

[Zmann]

there was a thread on this a while back at PSN pretty interesting stuff

but I think Swamps was the only one Who provided an# answer in that thread also lol

 

[Mdub707]

there was a thread on this a while back at PSN pretty interesting stuff

but I think Swamps was the only one Who provided an# answer in that thread also lol

It's probably one of those things most guys just pretend don't exist and hope for the best. I don't want to take the heads off of this truck again. I want to do this once and do it right.

 

[Zmann]

I hear ya