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Whats a good off-road carb

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gm500hprat

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Title says it. For those of us that cant afford fuel injection or engine setup will not work for Propane conversion. I have a BBC 468. Right now it has a crappy Holley that some old hack sold me that came off an old mustang or something and he shaved off the choke and all that stuff so it looks like a race carb. Anyways its a 500 hp engine has a decent cam with nice loap. the existing carb sucks offroad engine stalls over 2-3 ft whoops going slow or fast. Lets bring the ideas and let me know why. Keep in mind it's a big block so I'll need cfm's above 750.
 
i second the "quadgraBOG" on that one, you will lose a little HP but it will be better than your holley in your situation
LUKE
 
quadrajet's only have like 700 cfm right ? I've had quadrajets when I had my 350 and it definately ran better than this holly. But I dont think it will cut it for this engine.
 
i have the truck avenger, no problems at all and have never had it bog on an incline. definitely a good buy.
 
gm500hpwrat said:
quadrajet's only have like 700 cfm right ? I've had quadrajets when I had my 350 and it definately ran better than this holly. But I dont think it will cut it for this engine.
Click to expand...
Off the top of my head, I think they are around 770 cfm. Remember those secondarys are huge. Also, it's not just cubes, what's your top rpm?

Your second choice would be the holley truck avenger, in my opinion.
 
Well, I'm with you on the big carb idea, that's a lot of cubes and alot of rpm's.
You could probably use around 850 cfm or more in that beast. I'm unaware of a carb that size that would be a great choice for off-road.

Theres a carb shop guy down in Huntington Beach (sp?) that can probably help you, I'll try & find him for you.
 
Q-jets came as either 750 or 800 CFM (except the Edelbrock ones). The 800 CFM Q-jet is the best carb for your application.
 
Dig into the race-dezert bbs. There are carb shops that specialize in carbs for off road racing. Most of those will be Holleys. C&J i think is one such name.

Short of spending that kind of $$$ I think the Q is the best idea. Extend the float bowl vent up to within 1 tube diameter of the air cleaner lid, but don't go any closer. Wouldn't hurt to put a "baloney" cut on the top of the tube facing away from the venturies.
 
I actually had really good luck with my Edelbrock Performer 600 w/ off road needles and seats. You'd need a bigger one, but just my .02.
But one thing to note: AFB style carbs are notorious for getting dirt and crap in the float bowls, and I have to clean mine out every now and then to keep it happy.
 
My friend's 500 caddy is running a 850 cfm quadrajet (original caddy carb)...has an altitude compensating aneroid in it to adjust fuel mixture at elevation. Its probably the best carb for a big block, offroad application.
 
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