Thread: exhaust crossover in intake

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okay...
since i'm at the heads and intake, here's another thing;

I want to block off the crossover ports from the exhaust chambers (either at the heads or at the intake)...
what should or can I use to do that ?

I don't want that intake preheating system and I'm probably going to block the ports at the intake, but I'm talking exhaustgasses here...what's the treatment and material I should considder here?

ow, at the arrow in the pic is the opening I'm talking about...(just in case)

You can normally cut a thin piece of stainless (slightly larger than the port big enough for the gaskget to seal) and block tham that way.

That being said, personally I would NOT do it especially on a driver in cooler climates. Blocking the crossover tends to lead to slow warm up and associated drivability problems until the engine becomes fully warmed up.

I have a merc 410 in my 71 pickup. I am currently running an edelbrock performer intake, mild cam, headers and 2 1/2" exh, edel 750 carb, and c8ae-h heads. I am wondering if I would notice any gains by moving to a edel perf RPM intake. I do live in a relatively cold environment, would the lack of exhaust cross over hurt me too badly after warm up.
thanks,
kapp

Read these descriptions from Edelbrock and make up your own mind where you want the power.....

Performer® Manifolds (idle to 5500 rpm)
Performer manifolds are dual-plane, low-rise intake manifolds with a 180° firing order and patented runner design that you won't find in other brands. This patented design greatly improves torque over a wide rpm range for excellent throttle response, especially off-idle through the mid-range. Throttle Performers are ideal for passenger cars, trucks, 4x4s, tow vehicles and RVs. There are EGR and non-EGR versions available for most domestic V8 and some V6 engines. Most Performer intakes are 50-state street legal, when used with the correct carburetor and in the correct application. Check the individual listings for detailed information.

Performer RPM™ Manifolds (1500 to 6500 rpm)
Performer RPMs are dual-plane, high-rise intakes with 180° firing order to produce incredible top-end horsepower while retaining good throttle response. Their larger plenums and runners match the free-flowing exhaust, high-lift cams and other modifications of a high output engine. They are intended for high-performance street or competition engines that run up to 6500 rpm. They are not for emissions equipped engines. Edelbrock's Performer RPM gives you the ultimate in street high-performance.

Remember this, what you gain on the top, you give up on the bottom. There's no free lunch!