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Originally Posted by 65topless
thank you for any comment,help, info or tips  |
Pretty car. The question is, what do you have now and what do you want to swap onto it? I'll assume you have a 2bbl, otherwise you wouldn't need to swap. Any big block Olds intake will fit your 425. If you don't care about original equipment correctness, the cheapest thing to do is find a cast iron 4bbl intake and Qjet. Olds used a divorced choke (coil mounted in the intake) through 1969 and an integral choke (round black plastic coil) for 1970-up. Either will work, but the later parts are more common. You can also get an electric choke coil that works better than the air-heated one. All factory intakes flow about the same, but I'd avoid the 73-76 intakes with EGR. The Toro intakes have a depressed carb for hood clearance that may impact flow a little.
If you want to go aftermarket, I'd stay with a two plane, either a new Performer or the old O4B. Note the O4B won't clear an HEI if you plan to use one.
I've used the original style turkey tray intake gasket on both cast iron and aluminum intakes. Some people swear it shouldn't be used on aluminum but I've never had a problem (plus the factory used it on the aluminum W-30 intakes). I always use a new one and run a bead of silicone around each of the four water ports on both sides of the gasket. I throw away the rubber end gaskets because they always work their way out. Just build up a wall of silicone on either end of the block and let it skin over before installing the intake.
Note that the cast iron Olds intake is heavy, so be prepared.