After mounting intake with the supplied gaskets edelbrock supplied with intake i now have a an exhaust leak at intake. I used high tack to position gasket correctly as well. I personally thought gaskets were way to thin but used them anyway. Anybody have this problem before? Torqued intake to 40 ft lbs
Did you mill the block or heads at some point? That could cause some misalignment issues and you may need to mill the intake side of the heads or the intake itself to get everything to line up and seal again.
What year engine? What "year" gasket? I think the Performer will work with early or late BBB's. Absolutely smooth gasket surfaces(free of any leftover gasket goo or roughness, not necessarily re-machined flat)? Edelbrock supplied gaskets? What kind? Buick used the "thin" metal gaskets forever with no problems.
Block or restrict the crossover....aluminum conducts much more and faster than cast iron....too much heat to intake and carb...unless you are in Alaska
What was the gasket material? If it was some sort of fiber or composite i wouldn't use those unless the crossover was blocked. The heat would burn it up quick. The stock valley pan is around .020 but steel of course.
No Yes -72 like the title says -intake and gaskets were just bought -gaskets was a composite Composite. I just ordered the original steel gasket (fel pro) in hopes that works along with heat resistant RTV
Composite gaskets are for use with aluminum heads which don't have an exhaust cross over passage. When using them, you also need to cover the valley to prevent oil from being sucked up through the PCV valve, so you are way better off using the stock steel bathtub type gasket. When using the composite gaskets, you either need an aftermarket manifold splash shield, or you cut the center out of a stock gasket and use that.
RTV but theres no leak there. Just on the sides where the exhaust crosses over. Thanks for the input. I'll let you know how it goes once i get the valleyy pan.
I would think the composite gasket would hold up for a short time against the exhaust but the steel shim is the way to go with a basically untouched engine. I have to wonder if it not a problem with the AIR passages in the head. You can actually hear the exhaust leaking from the middle? I've heard of the end AIR holes not being covered completely. Any way you look at it if you are going to the trouble of installing an aluminum intake I'd block off the large exhaust passages in the middle to keep the extreme heat out of it. If you are running a choke or in colder weather drill a single 1/4" hole in one of the plugs near the choke coil to heat it up quicker. That will still keep the majority of the exhaust heat out of it.
Well the steel Felpro valley pan gasket fixed the intake leak, lesson learned. Thanks to everyone who chimmed in.
