My ex (now roommate) just gave me a 4bbl Holley double pumper carb that he'd been wanting to put on an old 302 truck he'd had. Said all I'd need to do is find a couple parts and rebuild it and I'd have myself quite a nice little carb. Problem is, I don't know the specs on it and he can't remember either. It has a serial number on the side (12R-10554B) and I don't rightly know how to identify it to get parts. Can anyone help? I'm also curious how 4bbl's work. I know a lot of racers use these and while what I want is something that's a sleeper, I also don't want to lose gas mileage if I don't feel like hotrodding it. Would a 4bbl give me much worse gas mileage or is it just if I lead-foot it that it'll go all fuelsucky on me? Thanks
Just look on the air horn (where the choke flap is). There should be a "list" number on there. Should start with an 8 if I'm not mistaken. The list number can then be used on holley's site to identify what cfm it is, what main jets came with, etc,etc. Looks like the "new" holley with the annular discharge nozzles , good carb. A double-pumper might be a little much for what you got, depending on the cfm. jmho
Hmm, looks like it might be the R840122-1, sound about right? I'll head over to Holley.com and see if they've got it, thanks!
Simply Googling the number tells you it's a 600cfm model 4010. It's not the best carb for your application. I wouldn't recommend a double pumper for a mild performance automatic transmission car, especially with a manual choke. It's an old carb.
Definitely and old carb - I can't remember off the top of my head what cfm it is but I do know I had one of those back in about 92-93. The closest I came on Holleys site was a R84012-2 (600 CFM 4010). Even if it was a R84012-1 it would still be a 600 CFM carb. There was no -1 on the listing.
Looks like the piece that has the exact number on it is among the parts missing. So it's not much worth putting into my car? Like I said I'm just going for good-running car now, maybe a little bit of a sleeper but nothing super ostentacious. Wasn't intending on putting a 4bbl on because I realize I'd likely have to change other things to compensate (can we say +$$$?) but I figured it'd be nice to have another carb whenever/if I get a little more adventurous. Is this particular carb just not a good one, or just not fitting towards what I'm planning? She's still an on-the-tree automatic with plans of C4 someday. I'm curious though, what would ya'll figure I'd have to change out to make this carb fit on my Comet? Obviously much more than I've got the $$$ or know-how to do now, but can a 302 run a 4bbl well without serious mods? Thanks!
My personal opinion here. I do not think that carb would be too big for your 302. The primaries and secondaries should be the same size. Or dang near it. It is a square bore carb. The "jets" in the carb are probably on the smallish side. As far as the carb being a good one, I would say it is decent. It has the removable top on it with the fuel bowls and main body being all one piece. No fuel leaks there. It looks as if it is missing the float needles and lock nuts that goes over the float. Remember that the side hung float carb is a better type for drag racing G-forces and a center hung float carb is better for circle track applications. JMHO. If she is a 3 on-the-tree automatic she should already have a C4 in there.
It's oversized paper weight, he still owes rent . Thinking outloud, Holley makes a good 2 barrel and you shouldn't have to change the intake.
"I'm curious though, what would ya'll figure I'd have to change out to make this carb fit on my Comet? Obviously much more than I've got the $$$ or know-how to do now, but can a 302 run a 4bbl well without serious mods? Thanks!" carb.,intake, cam and exhaust are a package JMO ...Ladys friend frank...
Holley made that type carb for a short time a few years back. It is based on the Autolite 4v. They never got popular and weren't as easy for folks to tune as the good ol' standard Holley. On this carb in particular: I wouldn't take it. Just looking at the pic tells me there is much to be done on it. On top of that, you WILL NOT be happy with a double pumper on your car anytime soon. Start out easy and one day when you don't drive the car enough to matter and you have a custom engine installed, you might go DP on it. Right now, it is just going to hit you in the pocket and probably not even run as good on your current combo as a nice vacuum Holley. My .02 Dave
