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If you run into trouble or just give up I have a rebuilt BBD from a ‘64 361 that I will never use again. Works fine. It’s yours for the price of shipping.
The triple pumper is truly awesome to drive, especially in a 4 speed. No waiting for the vac to reopen the secondaries after a shift (assuming you’re a person who lifts your right foot). The only carbs I can remember actually flooding a 440 with. These carbs are not common.
Bob, over the different brands and a broad number of years yes you are correct. Over a narrower number of years, 63-65 for instance, and staying within Mopar, you aren’t. I’ve rebuilt many of these, 383, 413,426 and they are ridiculously similar. Multi-carb setups have more differences of course...
FWIW most of those have such indescernably tiny differences they are interchangeable, assuming they are for a Mopar to begin with. If you compared that one to a ‘64 3611 or the 3644 on an Imperial you might, just maybe, find a difference like a jet size. Or not.
That would work fine on a stock 440. He’s pointing out that a stock 440 HP (375 HP) had a super similar but larger primary bore carb. That one is probably about 750 cfm. Probably worth 5-10 hp.
On a mild big block I have used and always liked a 3310-1. This is a 4150 series (has a front and rear metering block, regular jets in both). Has down-leg boosters (open in the middle, no little bar going across). Vacuum secondary (single pumper). 780 cfm. I’ve found these to be very...
My guess is with that very large cam for the street the idle needs to be so far open it’s pulling from the idle transfer slots and fouling the plugs. The best way out of the problem is a milder cam, then everything will match.
If a six pack at 990 cfm was ok on a stock cam, iron headed 440 I can’t see why an 870 should be too much on your significantly more agressive version. Needs deeper gears (3.91) and a 11” converter at a minimum though.
There are a huge number of variables, you’ve made a couple better but cam, timing with vacuum advance, and compression ratio are still unknown to us. Oh, weight too. If all that is stock-ish you’re probably at 14, on the highway with fi and that tranny maybe you hit 19. Most people never...
I’d go find a 3310-1, mostly because that’s what I did for the same setup. Love it.
On an earlier occasion, same exact car as yours, I used a Holley 830 annular discharge, really loved that, absolutely stupid throttle response.
There was a good question farther back up the stack. What was the starting point? Did it ever have a good pull down low while you’ve owned it? There’s a long way between a car that’s changed from good to bad and an engine that’s been built and never worked as hoped.
Lots of good suggestions so...
Yep, a float or needle problem. Of special note, some combinations that use the metering plate as opposed to the larger metering block can have the float rub up against the plate and get stuck. The metal floats all used to be the same, now they are different.