300 six carb
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Elder User
Joined: Sep 2009
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From: Indiana
300 six carb
I have a question I can't quite figure out. Why can you only get a one barrel carb for a 300 inline six? At least thats what the lmc catalog states. Why also would it matter what tranny, and truck you have to get the carb. Is it just me or it doesn't. The year on the engine matters. But the engine is what your buying the carburator for not the f150 or f250. Is there a something like a vacumm line that attaches to the carburator, and thats why you have to get a specific carb? Is it posible to get a 2 or four barrel carb? On a v block such as a v8, you have a classic 4 barrel carb. Do two barrels go to each four cylinders? Thanks for any help. Im not very indepth in carbs.
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From: Denver Metro Area, CO
that were designed as OEM replacements.
carbs that downshift the trannies upon heavy acceleration.
Of course, check in a local speed shop, or Summit Racing and Jegs if looking
online:
Summit Racing - High Performance Car and Truck Parts l 800-230-3030
JEGS Performance Auto Parts - Accel Billet Specialties Edelbrock MSD Moroso Mr Gasket
[1]New old stock - old parts that have been in warehouses and were never sold.
Fleet Mechanic
Joined: May 2009
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From: Bay Area, Unfortunately
A lot of guys run a Clifford 4 barrel intake and a Holley 390 CFM carb. From what I understand, bigger is just going to overcarburate it. Once you do that, you also need to get the extra spent gasses out. You might want to look into EFI manifolds.
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From: Blue Eye, mo. hwy 86 & JJ
knew a guy who put a adapter plate on his stock intake and mounted a 2 barrel carb... i'm saving my penies for the Offenhauser DP intake, it is a performance dual plane 4 barrel intake. be sure not to put anything bigger than a 500CFM carb on your six, there is a good six cylinder section of the forum that can probably do you more good, not as many people there as here but they're cool guys
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Elder User
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From: Indiana
oh, did not know that. I have a kickdown on my 88' 302 with efi. I forgot these older trannies bolted to these engines would have a kickdown mechanism too.
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Elder User
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From: Indiana
well thats cool that you can put a 4 barrel on a 300 six. I wasn't sure. But, once you have the correct cubic feet per minute carb, put the right jets on, and the right adjustments, you'd probably end up with a good running engine.
Post Fiend
Joined: Nov 2008
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From: McKenzie River
Pontiac used to offer a 250ci straight 6 with 4bbl carb as the base engine in 67-69 Firebirds, if they can offer it stock for those motors, it cant be too difficult to obtain a 4bbl Offenhauser intake manifold and 390cfm Holley 4bbl for the 300-6.........Ought to run great!
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Fleet Mechanic
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From: Bay Area, Unfortunately
The Pontiac one was actually an option (I had a base moder 68 with the 1 barrel 6) I am actually thinking about building one of the OHC Sprint 6's. They had 10:1 compression, 4 bbl, and various other improvements over the base. Sorry to sound like such a tool.
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Elder User
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From: Indiana
yeah, i used the carb selector on holley.com , and a 350 to a 500 cfm would do the trick depending on if the engine is modified or not. I think a 390 cfm with a manual choke is a great Idea. Im not much one for an electric choke. I've always likes the manual choke, so you know what is going on with the choke under the hood. But, still 2 barrel, four barrel, or even a rebuit stock one barrel? In your guy's opionions which is better on a well tuned 300 six and why? Thanks..
