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**Bob B.** · 04-29-2014, 03:51 PM

The V-6's really run well with the Holley 500 c.f.m. 2 bbl.. I don't know of anyone who successfully got a 4 bbl. on a 305, but it has been done on the large 401's and 478's. I guess all you could do is try. You might end up spending more on gasoline over time then you would buying the 2 bbl. now. The guys on the 6066GMC page are very knowledgeable about these engines.

04-29-2014, 03:51 PM	#2
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,396	Re: GMC 305e Carburator Choice The V-6's really run well with the Holley 500 c.f.m. 2 bbl.. I don't know of anyone who successfully got a 4 bbl. on a 305, but it has been done on the large 401's and 478's. I guess all you could do is try. You might end up spending more on gasoline over time then you would buying the 2 bbl. now. The guys on the 6066GMC page are very knowledgeable about these engines. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.