Machining Intake to match decked block???

[Taconite]

I have a 340 that I had rebuilt several years ago and when the machine was done the block was decked where the heads bolt to.

When I put my intake on its barely fits leading me to believe that I am going to machine the intake to mount the block. Is there a calculation used to figure out how much I need to have machined off the intake?

 

[oldkimmer]

.......There is ...but u need 2 know how much the heads r shaved......kim........

 

[70aarcuda]

take the intake gasket it out...does it fit now....?

use the thickness of the intake gasket as a guide..

also..just remember once that intake is cut...it is basically only going to fit that head/block combo.....that is why it is better to have the intake valve of the heads cut....

 

[fishy68]

take the intake gasket it out...does it fit now....?

use the thickness of the intake gasket as a guide..

Right. And they make different thickness of gaskets so you might find some that are thinner that'll allow you to use the intake as-is.

BTW: Are you trying to use the cork end gaskets? If so try taking them out and setting the intake on the engine with just the intake to head gaskets and see how it sets. I bought an engine once that had the heads milled a bunch and when I tried to install the intake it wouldn't set down and line up so I took out the cork end gaskets and the intake set down fine then. I used RTV to seal up the ends and it worked great.