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 applcations.

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- nogo 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 nogo gauge. These also have extensive air flow
modifications and a larger throttle bore.