Most likely Tom to reduce the volume of fuel for the engine size.
I just finished that black one for a 3.0 4 cyl and it had no inserts so I think you'll be ok.
Haha! the guy tried to build it himself and attempted to run it a few time unsuccessfully.
I found his accel pump check ball in the main jet passage behind the jet after I pulled it.....that's real bad!
And half the parts missing including the spring in the spring loaded needle & seat.
Please don't do what he did.
Jeff
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Carburetor building & modification services
Servicing the Pontiac community over 20 years
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