Exhaust cross over block or not? - Impala Tech
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post #1 of 3 (permalink) Old 07-31-2018, 05:26 AM Thread Starter
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Location: Auckland New Zealand
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Exhaust cross over block or not?

I’m installing a Edelbrock 2701 intake and a 1406 carb on a standard 350. What view do people have around leaving the exhaust cross over open, restricted or can you leave the gasket in tack and block it? Our weather is not overly cold and the car will mainly be used in summer. to me it makes more sense to not heat up the intake for improving performance. However not so sure the gasket will last be exposed to the exhaust gas?
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post #2 of 3 (permalink) Old 07-31-2018, 09:09 AM
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I don't worry about it as most aftermarket performance heads don't even have a cross over, nor do performance intakes.

If you block it with the supplied aluminum plate or the polished steel block off plate supplied with the gaskets it will burn through in about six months. Only way to plug it permanently is with high temp epoxy plastic.

If you are not going to block it off permanently then embrace the open exhaust cross over and do not worry about it.

Big Dave
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post #3 of 3 (permalink) Old 07-31-2018, 04:10 PM Thread Starter
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Thanks Dave, yes I think you are probably right. At this point I will embrace it, as the plan is to do a motor rebuild in 12 months where I will change the heads anyway. I was wondering if Edelbrock had put me wrong but then I’m only want 300-350hp once the engine is rebuilt. I need to do the intake and carb to get the car back on the road as stage 1. Thanks
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