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On my L-82 355 rebuild in 2014, I used Permatex beads on the intake ends as well, and used Permatex Aviation Form A Gasket from Napa on the advice of the expert builder, who did my engines bottom end and machine work, on the Felpro Blue intake gasket on the non bead side of the Felpro intake gasket as well. I did not torque the intake bolts as mentioned since you cannot and snugged them in the correct tightening sequence. I don't recall using sealant on the intake bolts and zero leaks since if the intake gasket is sealing correctly, there should be no coolant leaks through the bolts.
Lastly, the Permatex aviation sealant liquid that you brush on is really great stuff and really SEALS WELL!!! I originally used it in the build on the AFR heads with the Felpro .015 inch head gasket, again, on the advice of my builder who has years of experience with GM engine builds...zero leaks anywhere where the Aviation sealant is used.
Sealant or thread sealer on the intake bolts is not for coolant leak issues but rather the bolt enters the oily lifter valley. I have seen intake bolts wick oil from the valley. Usually just a extra snug of the bolt will cease this scenerio or add thread sealant.
I am getting ready to install a new set of manifold gaskets but I just realized that only one pair of the exhaust port restrictors came with the kit (there should be 2 pairs). How important is this to have it installed? I may end up re-using the ones from the gasket set I removed - only a couple of hundred miles old....
Two pairs of exhaust port restrictors? Where do you see a second port? Only the center port has the heat passage that warms the carb for you. As far as performance, you sure don't want heat under the carb. Most aluminum heads block off that passage anyway.
A better gasket would completely block off the heat. Unless you are driving your Vette in Antartica why introduce heat? A few minutes of carb warm up time is far better than carb boil-over time.
That doesn't appear to change the bolt pattern however. A true adaptor plate alters the bolt spacing so another type base plate will fit.
without it you can have a vacuum leak between the holley carb base and the manifold. some holley baseplate will not completely cover the manifold opening
Two pairs of exhaust port restrictors? Where do you see a second port?.
There is one port but two gaskets and each gasket takes a pair of the restrictors shown in a prior post - one side snaps on the other. I decided to use one from the gasket that I just removed. Blocking it off would have made more sense but the intake manifold is back on.
Ok, I see. I have never used that gasket. I always figured there was enough heat under the carb and I sure wasn't going to add to it. With my new heads the port is gone.
I don't know if you have ever witnessed gas percolating out of the fuel bowl vents on a hot summer day, but its not purdy.
Ok, I put the intake manifold with new gaskets back up, new intake manifold bolts, brand new carburetor Edelbrock AVS2 (1906). Did the idle mixture adjustment, idle and fast idle adjustments - it starts and idles just fine. It runs good except for a new problem which I will cover in a another thread.
Ok, I put the intake manifold with new gaskets back up, new intake manifold bolts, brand new carburetor Edelbrock AVS2 (1906). Did the idle mixture adjustment, idle and fast idle adjustments - it starts and idles just fine. It runs good except for a new problem which I will cover in a another thread.
Looks real good. I forgot Edel carbs have the PCV port off the front.
Someone will likely comment about the somewhat dangerous fuel line setup however.
01-14-2018, 12:42 PM
