Couple questions regarding carb choice.
 

So, I'm debating between a 500 holley 2 barrel or a 600 edelbrock 4 barrel. I have a friend of mine who can machine the manifold to fit the 4 barrel, but I was wondering. Has anyone done the 4 barrel swap? Any difference over the 2 barrel? I do plan on putting in a HEI...I have a pertronix system for a straight 6 292 that I'm pretty sure will bolt right in. Was reading a thread about the 500 2 barrel and have heard a ton of good things about it, but I always like to take things over the hill. lol

Re: Couple questions regarding carb choice.
 

I have converted two Magnum intake manifold to 4bbl but have yet to try one out. A few people have and it seems the best results are from the Edelbrock 500 cfm manifold, the 600cfm may be a bit much but hopefully someone else that's done one can share their experience. The 292 Pertronix will work as long as you have the same smaller distributor but I recommend an HEI for reliability and ease of the availability of parts as well as overall increase in performance.:my2cents:

Re: Couple questions regarding carb choice.
 

I did find an HEI on ebay for like $400 at one time...I'll have to search for it. I put a 600 edel on my 292 6 banger in my 66, works fine and helped alot..also has hei and headers. I believe I have the smaller dizzy, I used my 292's neww set of points and cap and all fit fine.

Re: Couple questions regarding carb choice.
 

There was a billet HEI distributor going for $255 on ebay from HEIDIZZY but I haven't seen his auctions lately, you can always use the Buick V6 even fire HEI and follow the conversion instructions on Jolly's site. If you feel the 600cfm will work that's your choice, considering the 305 does have larger ports and valves over a 292.

Re: Couple questions regarding carb choice.
 

Is that a magnum intake? Which adapter did you use may I ask? Thanks for the help!

Re: Couple questions regarding carb choice.
 

That is a Magnum manifold with just a 4bbl spacer bolted to it after the manifold was re-worked, my first build I did a spread bore to square bore adapter, here's a pic of the re-worked manifold without the spacer and the other with a spread bore adapter.:thumbsup:

Re: Couple questions regarding carb choice.
 

Thanks!

Re: Couple questions regarding carb choice.
 

http://6066gmcclub.com/forum/images/smilies/no-890[1].gif

forget the edelbrock, put a holly street avenger 4bbl on it. i would stay around 500 cfm. i have taken off several new edelbrock carbs and put on hollys. wow what a difference. they are way too rich out of the box, you can buy a kit to tune them, but it involves taking carb apart, changing rods and jets. holly is much easier to ajust, the last 3 street avengers came out of the box adjusted very close, only small adjustments needed. spend the extra hundred for the holly.
just my opinion, but i think you will be much happier with the performance


RICKhttp://6066gmcclub.com/forum/images/...890[1].gif

Re: Couple questions regarding carb choice.
 

Thanks Rick! I'll consider it fer sure. :thumbsup: I already have an edelbrock 600 which is why I'm considering using it. Cool stuff....maybe I'll use a turbo to. lol

Re: Couple questions regarding carb choice.
 

Gotta couple questions again...for now I'd like to rebuild the carb on there...anyone have any carb kit # as I have been going nuts trying to deal with Napa. lol

Re: Couple questions regarding carb choice.
 

If the carb on there is a Stromberg, here is a good kit. I am going to a Holley, I think I have one of these unopened in my stash.

http://www.ebay.com/itm/330899815576...%3AMEBIDX%3AIT

Re: Couple questions regarding carb choice.
 

Autozone carries the carburetor rebuild kit as well. The part number is 96-574.

-Jeannie

6066 GMC Club

Re: Couple questions regarding carb choice.
 

Thanks! :thumbsup: All I know is that this is a 67 or later 305 in my 64. Don't know if the 2 barrel was any different though.

Re: Couple questions regarding carb choice.
 

The is biggest difference I have seen is the accelerator pump bit. Some have a 90 degree turned portion where the lever attaches and some are straight. When you try to remove the lever on the front of the carburetor, that pivot screw has a left hand thread!

Re: Couple questions regarding carb choice.
 

Yeah...I'm a left handed guy so left hand thread I'm used to. :lolsmack2:

Re: Couple questions regarding carb choice.
 

There is a NOS GM Stromberg ww rebuild kit on ebay, it has the accelerator pump that's straight rather than the one with the 90 degree bend. If you're interested I'll send you the auction.

Re: Couple questions regarding carb choice.
 

If you could that would be awesome. :thumbsup:

Re: Couple questions regarding carb choice.
 

Can't believe I forgot to follow this thread up. lol A buddy of mine had a 4 down to 2 barrel adapter that I ended up using. YES, I know its like drinking coffee out of a tiny straw...BUT, I had to try it. Bolted my 600 edelbrock on there and the results were Great. With the stock points it burns clean and even still breathing though that small intake I get more pull out of it. So I'm quite happy with it. lol
After the 4 barrel was put on:
https://www.youtube.com/watch?v=d2dq1C4TyGo
Acceleration test:
https://www.youtube.com/watch?v=mdZlZlWRRMI