GM crossram intake-valve cover interference

VintageMusclecar · #1 03-04-2007, 11:21 PM

What's the trick to get a set of OEM cast Z28 valve covers past the base on a GM (repro) crossram intake? It appears the valve covers will need "massaged", but I don't want to do that unless it's absolutely necessary.

Eric

**Jeff H** · #2 03-04-2007, 11:56 PM

The factory manifold has a small area machined just above the ports to allow the clearance. I'm guessing the repo manifold doesn't have that machined area.

VintageMusclecar · #3 03-05-2007, 12:37 AM

Jeff;

I see what you're referring to, but the problem I have is the valve cover won't even go between the (factory) rocker arms and the "lip" on the base where the top plate bolts on. I tried to snap a pic of the area I'm referring to, but that didn't go so well.

It's definitely looking like I'll have to remove the lip on the top side of the valve covers if I ever want them to go on.

Eric

**plumL78** · #4 03-05-2007, 12:45 AM

You will need to trim the edge of the valve cover. You have to trim them with a real gm crossram intake too. I believe you will have to cut about .060-.070 off the covers

VintageMusclecar · #5 03-05-2007, 12:57 AM

Kerry;

Thanks, that's what I figured.

Eric

DarrenX33 · #6 03-05-2007, 01:44 AM

Whoa whoa, put on the brakes….

You should have that machined area on the repop manifold. Having a crossram is a maintenance nightmare. The manifold and valve covers (namely the drivers side as I recall) have to be put on at the same time. No cutting needed. However, like I said when you need to adjust your rockers its a little more work than just removing the valve covers.

Your intake gaskets too thick?