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This tunnel ram manifold for standard 23° S/B Chevy heads features include effective methods for the control of high velocity mixture flow, especially at engine speeds above 8500 rpm. Removable top mounts various carburettors Suited to drag race engines operating at 6500-10,000 rpm and race boat engines above 7000 rpm. Does not fit raised port cylinder heads or 1987 and later cast iron heads. Made in USA