Carb question for 305 V6 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rcbildr · 11-28-2012, 08:37 AM

I have a Holley 500 cfm (I think) 4 barrel carb and an adapter to mount it on a 2 barrel manifold. I was wondering if this would be a good upgrade later on for my 60 gmc's V6??? Thanks.
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**chevy_man5** · 11-28-2012, 10:30 AM

Rcbildr, Jolly's 6066 GMC site has all kinds of information on these engines. In the performance upgrades section http://www.6066gmcguy.org/performance.htm they talk about a Holley 500 2bbl. This is what I have on my truck, but that is the way I got it, so I cannot give you a comparison.

**MusicMan70** · 11-28-2012, 11:54 AM

If you are referring to this type adapter to squeeze the 4 down to a 2 barrel, i think you should stick with the Holley two-barrel and appropiate adapter or enlarge the intake to accept the 4 barrel like Rockdriller did on his GMC V6 project.

Like Chevyman5 stated; the 6066 website also has a photo album and a member shows how he modified his stock intake for a four barrel carb.

11-28-2012, 08:37 AM	#1
rcbildr Registered User Join Date: Sep 2000 Location: Gold Bar, WA Posts: 1,216	Carb question for 305 V6 I have a Holley 500 cfm (I think) 4 barrel carb and an adapter to mount it on a 2 barrel manifold. I was wondering if this would be a good upgrade later on for my 60 gmc's V6??? Thanks. Posted via Mobile Device Posted via Mobile Device __________________ My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28

11-28-2012, 10:30 AM	#2
chevy_man5 GMC's n H.D.'s too! Join Date: Oct 2010 Location: Nampa, Idaho Posts: 1,583	Re: Carb question for 305 V6 Rcbildr, Jolly's 6066 GMC site has all kinds of information on these engines. In the performance upgrades section http://www.6066gmcguy.org/performance.htm they talk about a Holley 500 2bbl. This is what I have on my truck, but that is the way I got it, so I cannot give you a comparison. __________________ Jason 1960 GMC 4x4 Babe (the Blue Ox) - Build Thread

11-28-2012, 11:54 AM	#3
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	Re: Carb question for 305 V6 If you are referring to this type adapter to squeeze the 4 down to a 2 barrel, i think you should stick with the Holley two-barrel and appropiate adapter or enlarge the intake to accept the 4 barrel like Rockdriller did on his GMC V6 project. Like Chevyman5 stated; the 6066 website also has a photo album and a member shows how he modified his stock intake for a four barrel carb. Attached Images __________________ MusicMan70 1961 GMC Suburban



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