Edelbrock 7531 Performer RPM - Air Gap AMC 304/360/390/401
Edelbrock's Performer design makes power from 1500-6500RPM, and the Air Gap keeps the manifold cool! AMC 304/360/390/401
The open air space from the Air-Gap design separates the runners from the heat of the lifter-valley cover. So, the air/fuel mixture stays cooler all the way to the heads, which produces a denser charge for more power. Runners are tuned to move the power band 1,000 rpm higher than Performer Air-Gap manifolds, from idle-5,500 rpm up to 1,500-6,500 rpm.
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