6066 (1960-1966) GMC Truck Club Bitcoin now accepted here! 
Pay Dues
Pay Dues or become a Site Supporter
 



Go Back   6066 (1960-1966) GMC Truck Club > 6066 GMC Truck Club Forum > Builds and Journals


Builds and Journals This is where the magic happens. Photograph & document your GMC build progress for posterity.
NOTICE - Photobucket will delete your pics after a time. Use another host if possible.

Reply
 
Thread Tools
  #11  
Old November 17th, 2018, 10:50 PM
AZKen's Avatar
AZKen AZKen is offline
-= Dues Paid =-
 
Join Date: Jul 2014
Location: State48
Truck: 1960 K1001 Wideside 305 BW Custom Cab
Posts: 977
Rep Power: 303
AZKen is a jewel in the roughAZKen is a jewel in the roughAZKen is a jewel in the roughAZKen is a jewel in the rough
Default Re: New member introducing myself and Holley carb

Hello David. Glad you found us.
Well well well, fancy that..........even Holley says the 500 is the wrong carb. 350 is all it can use. Like many of us have said many times. It falls on deaf ears because 500 is such a macho number. Then you fiddle and diddle and tune and tricks and change everything to make a 500 run and get no better gas mileage and still max out a 4000 RPM., same tranny, same differential, same gearing, same cubes, same speed. Oh gosh!

Now Holley is wrong....YOWZA! Bada Bing, Bada Boom! Rim shot please. I'm gunna put one on my 5HP Briggs and Stratton.

David, I would try to find a Bendix-Stromberg WW carb per our Carburetor Data Page. Easy rebuild and kits/videos available.

The "upgrade" to a Holley, described by Jolly, is on a 351. There are folks out there who have done it to 305's and have seen no improvement but are scared to say so. Actual testing has been done and shows no improvement in performance, but ignored. Holley Tech says will not benefit, now being ignored. It seems that the benefit is a perception. That's OK. So I do agree everyone should do what they wish as long as they hear all sides of the story.

Last edited by AZKen; November 17th, 2018 at 11:29 PM.
Reply With Quote
  #12  
Old November 17th, 2018, 11:46 PM
David's Avatar
David David is offline
Junior Member
 
Join Date: Sep 2018
Location: Portland, OR
Truck: 1964 1500
Posts: 5
Rep Power: 0
David is on a distinguished road
Default Re: New member introducing myself and Holley carb

Hi Ken,

Thanks for your reply. Unfortunately, I still havenít gotten to working on the carburetor, so I donít have current experiences to report to add anything to this forum.
But this is valuable info for me, and Iím ok with taking a little time warming up to this project so I can learn about what Iím getting into.
So long term fix is I look for a Stromberg, and short term Iíll still try to get the 500 cfm to do better than it is currently because I miss driving the truck! And itís mostly gonna sit until I get at least an improvement in this area.. couple other things/projects have jumped in front of her but Iíll get into it soon.

Thanks again,

David Cox
Portland, OR


Sent from my iPhone using Tapatalk
Reply With Quote
  #13  
Old November 18th, 2018, 08:42 PM
bigblockv6 bigblockv6 is offline
-= Dues Paid =-
 
Join Date: Jan 2013
Location: Rohnert Park, ca.
Truck: 1968 KM2500
Posts: 1,252
Rep Power: 360
bigblockv6 will become famous soon enough
Default Re: New member introducing myself and Holley carb

It runs pretty good as is but is running real rich. Was thinking I needed to tune the carburetor but I think Iíve got the wrong carburetor to start with.
Called Holley today for help idíing which carb is in my truck. The numbers show Iíve got a 500 cfm model 4412.
Asked what he would recommend and he said a 350 cfm.

Thanks for any advice,
David Cox
Portland, OR[/QUOTE]
Actually there is no advantage using the 350 cfm carb because it does nothing to increase performance and rather has no more to offer than the stock ww 2bbl carb. Yes you may have issues with the 500cfm carb running rich. Everyone here has given you the right advice on how to counteract the issue, also leaner jets would help. When I ran the 500cfm in my 68's 305E I had the timing and advanced over stock settings , also running the GM HEI distributor and had no issues of it running rich.
Reply With Quote
  #14  
Old November 19th, 2018, 05:59 PM
jagarra jagarra is offline
-= Dues Paid =-
 
Join Date: Apr 2014
Location: Reno, NV
Truck: 1962 Custom Wideside SB
Age: 73
Posts: 187
Rep Power: 79
jagarra is on a distinguished road
Default Re: New member introducing myself and Holley carb

The nice thing about the Holley is that you can get jets for it easily and tune it for your application. When I converted I used a aftermarket air filter set up from Summit, it is tall so it brings in a lot of air, way more than the stock set up. Found that my mileage decreased when I went down one size in the jets from what the carburetor came with.
Reply With Quote
Reply

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
New member introducing myself and Holley carburetor question David General Discussion 1 January 13th, 2019 03:22 AM
Holley carb on 305e HOTRODJOHN General Discussion 4 June 12th, 2016 05:53 PM
Holley Carb Archiver Previous Forum Posts 0 April 8th, 2010 02:20 PM
holley carb? Archiver Previous Forum Posts 0 December 25th, 2004 08:21 AM
Holley 500 carb Archiver Previous Forum Posts 0 August 27th, 2003 01:08 AM


All times are GMT +1. The time now is 11:11 PM.


Powered by vBulletinģ Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 117|0
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.