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Re: Headers and Dual carbs on a 6 cyl [Re: webstershotrods] #729198 Sat Mar 12 2011 03:25 PM
Joined: Oct 2006
Posts: 1,841
B
brokenhead Offline
Shop Shark
you can not "just throw dual carbs" on the small valve, low compression single exhaust smog engine that came with a 2 barrel and expect it to work. I looked up the specs on those engines you are talking about, they were modified in the factory, (didn't I just say that?) not the small valve, low compression, single exhaust smog versions with dual 4 barrels thrown on top. But then again I understand how engines work. But that isn't even the point, the point is, any engine of any configuration V-8, V-twin, inline 4, inline 6, V-4, well any engine, like I just said, can benefit from headers (AKA low restriction exhaust) and most likely a bit more carburetion (unless of course they already had 2 or 3 carburetors) given the appropriate internal modifications. The heads on these engines are pretty atrocious, but they can be improved. As far power is concerned I have seen a 292 putting out 485 HP, and have read articles where they were getting 900 HP out of a 302 GMC,(true it didn't have dual carbs, it had a wayne 12 port head with 6 injectors running alcohol...) I don't know what kind of power you can get in your part of the world but where I come from that is very respectable, and to top it off it would be somewhat unique, not the "hey lets put a crate motor in it" sheep mentality, I prefer to do some thinking on my own. I will give you the benefit of agreeing the V-8 would be easier, cheaper, and they ARE very effective. But to say these modifications do nothing to an inline six is incorrect.

Re: Headers and Dual carbs on a 6 cyl [Re: Hotrod Lincoln] #1174952 Fri Jul 22 2016 02:46 AM
Joined: Aug 2015
Posts: 17
6
60GMCFlat Offline
New Guy
Hey Jerry,
Can I hop up my stock carb ? Or what larger carb... do you recommend ? For my 261 ?


Whatever you are doing, have a good time at it..... Ya gotta do it anyway... So, enjoy life !!!!
Re: Headers and Dual carbs on a 6 cyl [Re: webstershotrods] #1174961 Fri Jul 22 2016 03:23 AM
Joined: Feb 2004
Posts: 19,687
H
Hotrod Lincoln Offline
Boltergeist
It takes some creative machining and welding, but I'm fond of modifying the stovebolt intake to accept the small-bore Rochester 2 barrel carb that was used on Chevy 265 and 283 V8's. If your 261 is stock displacement and running a stock cam, the 265 2-bbl. should be pretty close without doing a bunch of jet tinkering. A bored, stroked and hot-rodded 261 would probably work better with the one jetted and calibrated for a 283. I believe you'll get better performance and have fewer headaches with a single carb capable of flowing more CFM than you will with 2,3,4, or a dozen carbs on the same engine.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Headers and Dual carbs on a 6 cyl [Re: Hotrod Lincoln] #1174964 Fri Jul 22 2016 03:42 AM
Joined: Apr 2016
Posts: 468
M
mick53 Offline
Shop Shark
finally got your saying. I like it. I'm slow but I get there.


Old enough to know better, too young to resist.
Re: Headers and Dual carbs on a 6 cyl [Re: webstershotrods] #1174996 Fri Jul 22 2016 11:10 AM
Joined: Sep 2001
Posts: 29,302
tclederman Offline
Boltergeist
On my 261 that is .060 overbore (270 ci) and dual fenton headers, I am using a single Holley AA1 (2-barrel with adjustable jets) from a 302.

http://www.carbkitsource.com/carbs/tech/Holley/2100-index.html

You might also consider a Zenith from a GMC 270?


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Headers and Dual carbs on a 6 cyl [Re: tclederman] #1174998 Fri Jul 22 2016 12:00 PM
Joined: Sep 2012
Posts: 169
D
DaveV Offline
Shop Shark
Can a Weber 32-36 carb be re-jetted to work good on a 261? If anyone has done this, what size jets are needed? Dave

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