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Old 01-27-2003, 01:28 AM
Limey Simon's Avatar
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Post SBC Intake manifold - needs crossovers??

Guys, I'm fitting an Edelbrock RPM intake manifold to my Goodwrench crate Chev 350 motor (pre 86, 4bolt mains). The manifold has a crossover chamber between the central ports, but the gaskets I was sold (Mr Gasket #102) don't have cutouts for these ports.

Does this engine / inlet need the crossover chamber to be used?? If so I assume I was sold the wrong gaskets - can I just cut out the holes to line up with the ports?

Advice appreciated, Limey

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Old 01-27-2003, 03:48 AM
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you dont need these ports, i block them off all the time since they only warm up your carb and i've always learned that a cooler air/feul charge is denser, but the reasen why it is there is so the carb wont freeze up under heavy load and cold weather. also they tend to equalize some of the exhaust pulses .

regards Bas
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Old 01-27-2003, 07:31 AM
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Thanks Bas...... anybody else got experience with blocking off or leaving open??
Thanks, Limey
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Old 01-27-2003, 07:40 AM
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Block'em off, unless you're using a divorced (spring type) choke, sometimes restrictors are needed.
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Old 01-27-2003, 09:42 AM
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Yes block um.One thing though if thats a regular gasket after a while the heat will blow a hole in it.I use a Mr.Gasket set and the intake has a small round holes and a pair of metal plates to fill them with that completely cover the crossover port.These are prolly the best to block them off with.
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Old 01-27-2003, 11:11 AM
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With your weather over there I would recommend retaining the crossover, if this is a race only vehicle or you don't mind problems with carb icing due to humidity then go ahead and block it off.
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Old 01-27-2003, 01:54 PM
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the weather isn't that bad over here, and due to it,s construction the intake will be heated plenty on a small block, that's why they invented airgap manifolds.

regards Bas
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Old 01-28-2003, 12:56 AM
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Thanks for the advice guys - looks like I'll just blockthem off. Limey
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