These manifolds are identical to Edelbrock's #2801 and #2802 intakes, but with smaller runners for use on engines with a displacement up to 590 cubic inches, or for larger engines whose power band is primarily below 6500 rpm. Big Victor HV manifolds offer a smaller plenum and runner volume for optimal performance on engines with up to 590 c.i.d. and/or larger displacement engines operating 6500 rpm and below. This combo makes this an ideal choice for throttle stop applications or for custom ported versions to create unique port configurations.