Technical Carb 2 use?

58gmc 1/2ton truck with 302gmc 6cylinder , Clifford Intake, Clifford Headers, HEI ignition, camwork, 3speed with manual OD
Langdon suggested a holley390 or 4barrel Edelbrock 1406
12bolt has a modified 4barrel Holley turned into a 3barrel;good results he claims.
Just going to cruise around occasional hauling.

Still cant decide...

 

If you have both on hand just give them both a try. But if your purchasing. Put a Edelbrock for Easyer tuning and jetting.

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I have it narrowed to either that modified Holley from 12bolt or the Edelbrock.
No I don't have any carb on hand

 

So what is/are the differences in the holley390 and 12bot's modified 3barrel setup?I am confused about the two. Tom at 12bolt stated his runs on a single barrel until you push the pedal.;more efficient. Whereas the 390 is running on the idle circuit?

 

Anybody using the modified Holley from 12bolt ?

 

I have a Edelbrock Thunder Series 500 on a smaller GM 4.3 V6. Works excellent right out of the box

 

I run a 500 cfm 1850 single feed Holley on our race 302 and ran it on our stock one too. It was cheap and easy. We ran it as a vac secondary for awhile and now it's mechanical. I don't really see a difference. The driveability is great and tuning simple.

 

http://www.12bolt.com/store/p115/3_Barrel_Holley_carb_and_conversion_kit.html
watch the video. Makes sense to me for a daily driver,right...

 

What a great idea. Will take some tuning as he says. I wonder why he wouldn't use 4th gear in his 5 speed? If is an overdrive, the last rear gear I would ever want is a 2.56.

 

I went with the modified 3barrel Holley from Tom Lowe-12bolt

 

That's different. I'd really like to see the manifold he is using. It looks like this is a 6 cylinder thing only; I don't see how it could work on a V8.

 

I believe it's only for 6 cylinders


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The 3 BBL modified holley works great.
One tuning tip. Use 2 springs in the secondary. I use the lightest one and one step down from the stiffest.

 

Real Holley 3 barrels were 1050's might be a tad over carbed for a 302. I've been 171 at Bonneville with a 600.

 

"tad over carbed"
go to 12bolt and watch his video about how he modifies the 4barrel to make it a 3barrel.For a cruiser it will do fine(for me)--

 

Thanks, I have seen his video and forgot about his conversion. It's really a good idea since most 6's came with a single barrel and would continue to perform well as you say by crusing. Opening one up using all barrels of his carb conversion would happen during acceleration and a GMC can handle that well even with very little hop-ups. My reference was to the real Holley 3 barrels that performed extremely well an large engines.