GMC 305 4 barrel intake - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**aerotruk63** · 01-15-2015, 09:04 PM

Did GMC ever make a four barrel intake that would bolt on instead of the two barrel. I know a guy with a 65 Suburban that wants to convert it to two strombergs mounted on a four barrel intake.

padresag · 01-15-2015, 10:10 PM

no 4 brl manifolds. a common current upgrade is to put a 500 holley 2 barrel on them. inquire at the 6066 GMC site
ron

TJ's Chevy · 01-16-2015, 12:09 PM

No 4 barrel intake...though I'm sure you could adapt a 4 barrel to the 2 barrel intake using trans-adapt. Kind of a waist though....but the biggest thing was a 500 cfm holley 2 barrel.

**MusicMan70** · 01-16-2015, 02:57 PM

ERL on this site adapted a quadrajet to the two barrel intake. Another guy on the 6066GMC site did the same for an Edelbrock.
So you can probably open it up enough to adapt this Elco 2 two-barrel intake adapter for the demon carbs or whatever others he may have in mind.

padresag · 01-16-2015, 03:41 PM

http://6066gmcguy.com/holley.html is for the 500 holley setup. you may find by google how to modify the manifold for a 4 barrel as it has been done as above but the was another showing the steps. it was by a member of 6066 . if you post the question over there , I am sure that you will get a response
ron

**MusicMan70** · 01-16-2015, 03:54 PM

http://67-72chevytrucks.com/vboard/s...=453161&page=3

padresag · 01-16-2015, 04:53 PM

Quote:

Originally Posted by MusicMan70

http://67-72chevytrucks.com/vboard/s...=453161&page=3

that is pretty identical to the other i was mentioning. more than likely where he got it from
ron

**aerotruk63** · 01-16-2015, 05:45 PM

Thank You Ron for the suggestion and info. Thank you MusicMan for the info as well.

duallyjams · 01-16-2015, 08:12 PM

You would have to dig in the archives on 60-66 site to find the threads but pretty much like the pics already posted you can take the big 2 barrel intake and have it machined to accept a 4 barrel then add a throttle body for efi.

**aerotruk63** · 01-16-2015, 09:29 PM

He wants to mount dual Stombergs. Asked me to start looking for an another intake so he can preserve the original. He'll modify another so the Stombergs are spread apart and higher up than the Speedway adapter.

**Corts60** · 01-16-2015, 09:56 PM

Quote:

Originally Posted by aerotruk63

He wants to mount dual Stombergs. Asked me to start looking for an another intake so he can preserve the original. He'll modify another so the Stombergs are spread apart and higher up than the Speedway adapter.

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

I performed this mod several years ago with the factory manifold….

padresag · 01-16-2015, 10:19 PM

this guy built his own adaption

ron

01-15-2015, 09:04 PM	#1
aerotruk63 Check The Champ, Demonstrator Join Date: Jun 2009 Location: Montreal,Quebec Posts: 6,627	GMC 305 4 barrel intake Did GMC ever make a four barrel intake that would bolt on instead of the two barrel. I know a guy with a 65 Suburban that wants to convert it to two strombergs mounted on a four barrel intake. __________________ 1963 *Chevrolet Truck* Literature LINK: https://picasaweb.google.com/113840717762774560215 YouTube Channel with 20+ Original *Chevrolet Truck* Salesmen, Mechanics & Service Department Training Slideshows. https://www.youtube.com/results?sear...otruk63&page=1

01-15-2015, 10:10 PM	#2
padresag Registered User Join Date: Feb 2008 Location: Sidney,b.c. Posts: 4,425	Re: GMC 305 4 barrel intake no 4 brl manifolds. a common current upgrade is to put a 500 holley 2 barrel on them. inquire at the 6066 GMC site ron

01-16-2015, 12:09 PM	#3
TJ's Chevy Registered User Join Date: Mar 2013 Location: Southern Oregon Posts: 10,384	Re: GMC 305 4 barrel intake No 4 barrel intake...though I'm sure you could adapt a 4 barrel to the 2 barrel intake using trans-adapt. Kind of a waist though....but the biggest thing was a 500 cfm holley 2 barrel. __________________ 1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw

01-16-2015, 02:57 PM	#4
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	Re: GMC 305 4 barrel intake ERL on this site adapted a quadrajet to the two barrel intake. Another guy on the 6066GMC site did the same for an Edelbrock. So you can probably open it up enough to adapt this Elco 2 two-barrel intake adapter for the demon carbs or whatever others he may have in mind. Attached Images __________________ MusicMan70 1961 GMC Suburban

01-16-2015, 03:41 PM	#5
padresag Registered User Join Date: Feb 2008 Location: Sidney,b.c. Posts: 4,425	Re: GMC 305 4 barrel intake http://6066gmcguy.com/holley.html is for the 500 holley setup. you may find by google how to modify the manifold for a 4 barrel as it has been done as above but the was another showing the steps. it was by a member of 6066 . if you post the question over there , I am sure that you will get a response ron

01-16-2015, 03:54 PM	#6
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	Re: GMC 305 4 barrel intake http://67-72chevytrucks.com/vboard/s...=453161&page=3 __________________ MusicMan70 1961 GMC Suburban

01-16-2015, 05:45 PM	#8
aerotruk63 Check The Champ, Demonstrator Join Date: Jun 2009 Location: Montreal,Quebec Posts: 6,627	Re: GMC 305 4 barrel intake Thank You Ron for the suggestion and info. Thank you MusicMan for the info as well. __________________ 1963 *Chevrolet Truck* Literature LINK: https://picasaweb.google.com/113840717762774560215 YouTube Channel with 20+ Original *Chevrolet Truck* Salesmen, Mechanics & Service Department Training Slideshows. https://www.youtube.com/results?sear...otruk63&page=1

01-16-2015, 08:12 PM	#9
duallyjams Registered User Join Date: May 2007 Location: Deale Md Posts: 4,663	Re: GMC 305 4 barrel intake You would have to dig in the archives on 60-66 site to find the threads but pretty much like the pics already posted you can take the big 2 barrel intake and have it machined to accept a 4 barrel then add a throttle body for efi. __________________ James 63 GMC V6 4speed carryall 65 chevy swb bbw V8 auto 68 K20 327/4 speed, buddy buckets 2002 GMC CC Dually Duramax 64 GMC lwb 3/4 V6 4speed SOLD 66 GMC swb bbw buddy buckets SOLD IG duallyjams The only thing that stays the same is constant change!

01-16-2015, 09:29 PM	#10
aerotruk63 Check The Champ, Demonstrator Join Date: Jun 2009 Location: Montreal,Quebec Posts: 6,627	Re: GMC 305 4 barrel intake He wants to mount dual Stombergs. Asked me to start looking for an another intake so he can preserve the original. He'll modify another so the Stombergs are spread apart and higher up than the Speedway adapter. __________________ 1963 *Chevrolet Truck* Literature LINK: https://picasaweb.google.com/113840717762774560215 YouTube Channel with 20+ Original *Chevrolet Truck* Salesmen, Mechanics & Service Department Training Slideshows. https://www.youtube.com/results?sear...otruk63&page=1

01-16-2015, 10:19 PM	#12
padresag Registered User Join Date: Feb 2008 Location: Sidney,b.c. Posts: 4,425	Re: GMC 305 4 barrel intake this guy built his own adaption ron

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