[Firebob]

So I got the old heads back on and tq'd. Valley pan on. Now I go to line the performer up that I had on before and low and behold it don't fit worth a dam. Ports are way off. Seems like it fit before but maybe I just don't remember right. I only had the block decked about .007. Nothing done to the heads. Intake gaskets are approx .052 thick and if it remove both and set the intake on without them it sits down where it needs to be. I guess I'm looking at getting .050 trimmed off each side of the intake to make things line up right. Sound right to anybody else?

[428goat]

Maybe they decked the block more than the .007 and maybe they milled the heads also but not on the intake side?

[Dick Boneske]

.050 or .060" will fix your problem. I had the same thing on our 467 with E-heads. Don't take off more! You've already proved that the gasket thickness is all that needs to come off the manifold surfaces.

[Firebob]

I talked with a local builder and he said he doesn't even try and install them out of the box anymore because they always need adjustment. I'm surprised at how much but I guess it is what it is. Was wondering some about the gasket crush. They are the same design as head gaskets but because of the angle they bolt down I don't think they compress the same way.

They cut the deck down from 10.24 to 10.18 to leave the piston tops .004 in the hole. So .006. Not sure it was worth the $150 to have it done but...water under the bridge.

Robert

[shaker455]

Taking .060" off the deck of the block is outrageous!

I like to stay about 10.220" on the deck & if you had pistons that far down in the hole I would have made another selection.

Don't blame the intake...

I've machined many intakes and generally I trim .030" off and fit it.

[67cruiser]

Don,t fill bad my rpm was the same way & i had only .007 off the heads for sure. Holes off
can hardly bolt intake on plus i had .020 takin off intake.Good luck hope it works out for you ok.

[Firebob]

The calcs I got from the shop were 1.714(CI for 2262) + 6.625(rod) + 1.875(stroke)= 10.214 . Plus I wanted another .004 in the hole. So 10.218. OE deck is 10.250-10.218= .032 .
I guess I never really looked at the math that closely before. At least I feel better now about spending the money on the deck trim. I did check it after assembly and everything was right there. I suppose it makes more sense then that the intake is that far off now.

[Skip Fix]

Check it is not hitting the valley pan on the bottom also.

[Firebob]

Good idea Skip. I think I'm alright there because like I said if I remove both gaskets it sits down nicely flush against the head surfaces and low enough for the ports to line up properly.

I ran into another glitch today(go figure). When I went to install the pushrods and rockers they were way off too. I was using stock length pushrods before and I had good contact pattern on the top of the valve stem but today when I put them in they are way too short. Now I would've thought that cutting down the deck height would've required shorter pushrods after not longer ones. I did change cam and lifters to some Crower's but I would think they would be the same height as any off the shelf brand lifters. I don't get it. Anyways it looks like I'm in the market for some new pushrods. Boy, you change one thing and everything else goes to hell.

[grandville455]

I had .060 taking off my heads, and were thinking at least .075 off the intake , maybe more by looking at the ports with no gasket.

[Dick Boneske]

The ratio of the amount milled off the head-to-block surface and the amount off the intake manifold surface needs to be the same. All the angles involved are 90 degrees, so the ratio is 1:1.

If the intake fit right with the ports and bolt holes before the milling, it would fit after milling the heads--if the intake surface on the heads was milled the same amount.

As I said in an earlier post, my intake needed .060 taken off each side---the surface that contacts the heads.

The .007 you had taken off the block deck is not why your manifold doesn't fit. Here again, the ratio is 1:1. The .007 would not be significant in fitting the manifold. It wouldn't have fit right before the block was milled .007

[grandville455]

Dick, Not sure if this was directed to me also? My heads didn't have the intake face milled just the deck of the heads, that's why we need to go so much, I looked at Intake , and I could see im guessing 1/8 of the top of the port on head. It looks like firebob had .032 taken off deck from his latest post? That would make the intake not fit so good anymore imo.

[Skip Fix]

When I had the 6X-4 on the 81's 400 milled 0.050 and a zero decked block I had to grind on the intake(Performer) and valley pan for clearance at the bottom.

[Firebob]

Well I went ahead and cut off the water cross-over yesterday to make it easier to fit after I get it trimmed. Sounds like that is a typical operation that most shops should be able to handle, right? I mean a lot of people need it done although most probably don't.

[b-man]

Probably would have been better to leave the crossover intact, to add stability to the intake for the milling operation. That and you would end up with a crossover that has been milled to fit as well.

[Firebob]

Bman, you are probably right but it was one of those time things. I had the time to do it now and I might not later. I'm not worried about the cross over fit. I'm sure it will allow adequate flow even if it's misaligned some. Went to one shop today and the flunky said they didn't have a jig to make that kind of cut. He gave me the name of the shop where he said they would send that sort of thing to. We'll see. 0/1

[GRX]

Originally Posted by Firebob

They cut the deck down from 10.24 to 10.18 to leave the piston tops .004 in the hole. So .006.

Need to rethink your math & numbers.

10.24 - 10.18 = 0.060 ... so was .006" or .060" removed?

Originally Posted by shaker455

Taking .060" off the deck of the block is outrageous!