[scotty's chev]

In the process of finishing my engine trying to install my intake it's not really close. So I grinded the tabs off the side. That helped they were hitting. Then went to machine shop they took 30 tho out. Now with the stander felpo gasket it's still bad. Without it's showing 3/4 of the bolt holes.
Any guesses on how much more it has to go??? And has anyone else had this happen. Heads and block have been decked. New intake is an rpm air gap

 

[Mike]

Who ever cut the block and heads should have informed you that the intake and/or block would need to be cut for the manifold to fit correctly.
It's a calculation based on how much was removed from the surface of the head and/or the block.

Is the intake actually on the heads or is it sitting on the china wall?

 

[jmartorana]

You will need to post more info for someone to help.
How much was the deck milled?
How much were the heads milled?

 

[69-CHVL]

Have you tried 1/8" gaskets?

 

[CNC BLOCKS N/E]

In the process of finishing my engine trying to install my intake it's not really close. So I grinded the tabs off the side. That helped they were hitting. Then went to machine shop they took 30 tho out. Now with the stander felpo gasket it's still bad. Without it's showing 3/4 of the bolt holes.
Any guesses on how much more it has to go??? And has anyone else had this happen. Heads and block have been decked. New intake is an rpm air gap

Sounds like someone cut the heads alot and never cut the intake side of heads. We always correction cut the intake side of the head and maybe a little extra for what is cut of the decks and this has always worked for us. If we are doing the block and build we will cut the top of the block and then any intake out a box should fit and so far they all have!!!

 

[FRYNTYR]

Sounds like someone cut the heads alot and never cut the intake side of heads. We always correction cut the intake side of the head and maybe a little extra for what is cut of the decks and this has always worked for us. If we are doing the block and build we will cut the top of the block and then any intake out a box should fit and so far they all have!!!

X2

If the heads have been decked a bunch the intake side needs to be shaved too. If you decide to cut the intake manifold only, now the intake will really only work with those heads unless you have another set of heads cut a bunch too. I won't cut a intake manifold.

You want the stack up corrected oon the intake side of the heads so no matter what you put the heads on, any out of the box intake will work.

 

[BillyGman]

Another thing is you need to know if the heads were straight cut or angle cut. If they were angle cut, then I believe that the bolt holes all need to be spot faced since the head will now sit at a different angle. Which hopefully was also done. I'd either bring the heads and the manifold back to the place who decked these heads, or if for some rason that isn't possible, I'd bring them to a reputabable machine shop which is known to do machining work for race engines, and explain your problem to them, and have them check all the surfaces and do whatever is needed.

 

[scotty's chev]

its a 496 all used stuff all new to me. i picked the machine shop i used because he was busy and i heard good things. only problem is i was sort of rushed in rushed out and every time i called he was super busy so i didnt get all the info and specs even on pickup he he was super busy. so how much the blocked was decked????? no clue. pistons are just under flush with deck. the heads are 990s with a large port job. they had the groved head gasket thing going on and on 2 spots had the ring burnt out so head was decked straight and cleaned. god only knows how much the heads have been decked. i think im going to make a cardboard template and see if i can figure it out more. ohh and also the heads intake side look stock.

 

[GRN69CHV]

Little cheater trick, use .030" offset dowels to move the heads out.

 

[scotty's chev]

Final fitting was don't today at 90 thou cut out....

 

[blasttime]

When you get that intake fitting right check oil pump engagement. Measure dist then intake to top of pump shaft and subtract for engagement. Would not hurt also to see what dist gear engagement looks like with a little grease. Good luck

 

[scotty's chev]

I used 2 gaskets on it. 1 there was a little play from bottomed out so I figured a two would be a good gap