Spec 1
These carburetors are built for oval track classes that require a stock appearing gauge legal 750 vacuum secondary carburetor. Reworked metering, vacuum system, and blueprinting provide smoother, quicker throttle response and a significant power gain. These are popular for classes limited to a vacuum secondary carburetor and street/strip applications.

Spec 2
These are built for classes that require a 750 vacuum secondary carburetor but allow visual modifications, or do not have to pass a go/no-go gauge.

Spec 3
These are built for classes that require a 750 vacuum secondary carburetor but allow visual modifications, or do not have to pass a go/no-go gauge. These also have extensive air flow modifications and a larger throttle bore.