Has anybody got Any tricks about putting the upper intake gasket on a 1991 302?? I have put it on twice now!!! The first time it Reved to 6K second time it was Only 3K maybe next time it will be right on???? Can I use any gasket stuff to help keep the gasket in place should I put it on the upper I take???? I have been putting it Dry on the lower intake????? Please I need help!!!!!!!!!!
Thanks!

 

Are you talking about 9H486 ?

(click this text)


I always install it dry. If you use any gasket adhesive, it should ONLY be applied to the part that gets removed first (the plenum) so it's easier to clean off next time. But it shouldn't be that difficult. Have you checked both surfaces for flatness? Is this a totally-stock engine, or did you bolt on some aftermarket parts? Post pics, and put ALL the truck's details into your signature as this page explains:

(click this text)

 

I It's a Stock 91 302 the only reason I took it off cause the Value covers were leaking bad! So if I use gasket stuff only put it on the upper manifold? Right? I just need it to hold the gasket on until I get it on the Lower Manifold!! I was putting the Gasket on Dry on the Lower manifold and I think I must be Hitting the gasket with the upper intake?? But I will put Straight edge on Both Manifolds when I take them off. I am going to double check and make sure it's Not just a vacuum leak (I wish) it was that. Thank you. Yes it's 9h486 gasket I couldn't get that to show up at first.

 

So you don't even know WHY it's idling high yet? You were just guessing that it's leaking at that gasket? Don't separate it again - get a mechanic's stethoscope (or ~3' of garden hose) and listen around the idling engine for an obvious hiss (like what you hear from the throttle body) indicating a vacuum leak.

(click this text)


...and fill in your signature.