Spec 1
These carburetors retain factory dimensions with a fully reworked fuel curve. These work well on the GM 602 crate motor or for small cubic inch street rod & street/strip applications.

Spec 2
Designed for small block applications similar to and including the GM 602 or 604 crate motor. These have a reworked fuel curve, machined main body and throttle shafts, screw in adjustable bleeds, etc. This is an excellent choice for crate late model racers running the 602 or 604 motor.

Spec 3
Designed for small block heavy car drag applications up to 377 C.I. they also work well for short oval track applications where
maximum acceleration off the corners is needed. Great on the 604 motor.