Bendix Stromberg carb replacement

[Tjmac23]

Hi all,

I have a 1966 GMC 3/4 ton pickup with 305 V6 big block. The Stromberg carb has had it and I’d like to replace but having tough time finding a 2bbl carb that will fit to current intake manifold.

I like the Holley 2bbl #7448 350 CFM. The current four bolt pattern on manifold is 3 1/4 X 1 7/8. I tried to find an adapter to accept the Holley carb but had no luck. Any advice?

Should I have an adapter machined to fit current manifold or replace the manifold in order to mate with Holley carb? Thx

Tjmac23

[MusicMan70]

Welcome TJMac!

Here is link from the Jolly page showing how its basically done.

http://6066gmcguy.com/holley.html

You will need this style adapter and if you wish, open up the base to match the adapter.

https://www.summitracing.com/parts/mrg-1937mrg

Most have used the Holley 500 and good info here as well;

https://6066gmcclub.com/index.php?

[Tjmac23]

Much help ...Thank you. Would you recommend Holley 350 CFM or 500? I’m not looking for speed obviously but just want better engine performance.

[MusicMan70]

Most of the others have reported better results with the 500.

[nbrfd007]

500 Holley works great on my 305 V6 GMC, highly recommend doing the HEI conversion, the info is on Jolly's site.
Tim