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Aftermarket Intake Manifold Exhaust Crossover?

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Old 08-01-2011, 11:10 AM
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Aftermarket Intake Manifold Exhaust Crossover?

Weiand offers a low-rise, dual plane intake manifold called the "Street Warrior," which is a direct competitor to the Edelbrock Performer. This manifold has an "exhaust crossover for improved street drivability." Can someone tell me what that means?
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Old 08-01-2011, 12:00 PM
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Many V8 engines have a coolant crossover in the intake manifold, that's where coolant flows to get from one side of the engine to the other.

The M-block engines (351C, 351M, 400, 302C in Australia) had a "dry manifold" in that no coolant crossed in the manifold BUT there was an exhaust crossover.

This was to heat up the carb area for quicker warm-ups in the wintertime.

The crossover was throttled (at least on some applications) so as to keep from overheating the manifold & carb. but I understand many people disconnect that apparatus when they replace their exhaust systems and that can cause problems with gas boiling in the carb bowls.

I have an Edelbrock Performer 400 on my 400 (M-block) in my 1981 F350.

To which engine does this "Street Warrior" thing apply?
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Old 08-01-2011, 12:58 PM
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It looks like the "Street Warrior" is a just new name for the "Action Plus" manifold.

This is for a 302 engine:
Weiand 8124 Weiand Street Warrior Intake Manifolds
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Old 08-01-2011, 02:50 PM
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The exhaust crossover runs under the carb. All intake maniflods from the 60s and 70s
had them for quicker winter warmup. To work it has to have a corresponding opening
on the cylinder heads to route a little exhaust thru intake. Most newer and aftermarket
cylinder heads don't have the crossover provision because most engines now are
fuel injected and don't need the crossover. It was common on high performance engines
in the 60s to block off the passageway for a cooler more dense intake charge.
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Old 08-01-2011, 03:07 PM
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That's EXACTLY what I was looking for, Hickory.

Thank you!
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Old 08-01-2011, 03:35 PM
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This is also where the EGR will get its exhaust gases on some engines, including my 460.
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