The intake side of the head's get closer together,therefore it no fittie.

 

Youre right that makes sense but Id think you would need to mill down the edges so it sits lower on the block.

 

When the heads get closer together on the intake side from decking or cutting the head, where the intake will not go down far enough to line up the port's(most important thing),then some has to be taken off the intake side of the head or the intake itself to line the port's up. Then ya fix the bolt holes to line up and the face angle for the bolt head to be correct.Ya also have to remove some off of the ends if that won't let it go down but there is no specific gap dimension for the end rails unless ya want to run a gasket of thick paper, cork or rubber.
It takes a fair amount of cutting to get the intake not to line up.

 

Unless you port match the intake after you see how it fits to the heads. Thats how I would rather do it.

Only have to fix the face angle IF you angle mill the heads. The face angle doesn't change other than that.

Bret

 

So basically what you are saying is that you should never have to mill the intake unless you angle milled the heads?

 

Well i dont know whats up with mine, but golen 383 zero decked, LE2 heads, and my intake doesnt fit right, tried to put it on today. I opened the holes but i guess not enough, gonna try to get more work done when this hurricane lets up

 

Check it to see if the ports line up. If it is to high it will leave a step in the floor and roof of the port,not good for air flow. Just slotting the bolt holes and installing doesn't mean it fit's.

 

ugh i gotta use that grease method someone mentioned?

 

So if i have .015 taken off from Lloyds milling + my block is zero decked, what do i need to have taken off of my intake sides and rails, cause it obviously needs to be done.

 

sorry to dig this up.

dont forget, you guys also have to account for a reduction in combustion deck height when you install a thinner head gasket. going from a .049 gasket to a .028 is .021 difference. take that into account as well when you consider the difference between stock height of the heads. i had an overall difference of .036. my intake would not seal properly on the inside edges where the intake meets the heads. if you do consider getting the intake milled, you have to use the formula stated from the LT1 rebuild book noted in a previous post. otherwise you could make the bottom of the intake wider/narrower than it was previously and still cause you sealing issues.

i was under the impression that due to the reduction in combustion deck height, the heads would actually sit closer together. causing the intake to sit higher up on the heads. removing the material actually allows the intake fall into place with the now closer together heads. correct me if i'm wrong here.

i had a problem with the intake sealing. i tried several ideas to fix the problem without milling. i milled the intake using the formula from the LT1 rebuild book and now my sealing issues are pretty much gone.

as far as signs the intake is not sealing, mine were way obvious. i could pull a spark plug out and find it saturated with oil. pull the intake and there was a definite line of oil coating across the entire intake gasket.