'65 Corvette Carter AFB 3720SB

[Oliver S.]

Hello,

I have got an early '65 Corvette 300hp MT (#48) with a Carter AFB 3720. Actually, the carb should be a 3721 but the dates of car/engine assembly and carb date (Aug '64) would match. There's no difference between these carbs regarding jets etc.
What astonishes me is the accelrator spring mounting, since there's a hole missing in the arm:
Is this a difference between the 3721 and 3720?

Regards
Oliver

[Duke W.]

Re: '65 Corvette Carter AFB 3720SB

The throttle link is not part of the carburetor assembly, and it should have a hole to accomodate the return spring. You can probably drill one.

I believe the only difference between the 20 and 21 is the throttle lever arrangement for the PG kickdown rod.

Duke

[William C.]

Re: '65 Corvette Carter AFB 3720SB

I may be wrong, but I thought the spring end went thru the hole in the throttle arm end, eliminating an extra clip from the assembly process.

[Duke W.]

Re: '65 Corvette Carter AFB 3720SB

That's the way it always was on my 340 HP SWC engine, but the AIM shows a cotter pin in Section 6 for the WCFB, and no additional information in the L-75/76 section.

Duke

[John H.]

Re: '65 Corvette Carter AFB 3720SB

There's a hole through the rod on the inboard end (facing the carb), and the end of the spring goes through that hole; see UPC 6, sheet D2, View "A" in the '65 Assembly Manual.