I was given a free holley 500cfm 2 barrel carb today, or what I think is a
500cfm carb anyways. It reads 4412-3 on the choke flange. Anybody have good results with thiers?? Any good tuning tips for jetting with this or
would I be wasting my time?? I think it's worth a shot

I have had great success with the Holley 2300 series 500cfm 2bbl on an offy 4v intake with transdapt adapter plate. Good throttle response (50cc accel pump), great power, easy to tune. Don't know if 4412 is a 2300 series or an OEM usage.

I believe I have 66 or 68 jets in mine now and it ran 14.9 in my Valiant at The Rock with 3.00 rear gear and a fairly mild motor (228@0.050 cam and 8.8:1 comp, but good headwork).

Seymour P has run in the 13s with the same carb I have.

Mileage can be quite good too - got 22-23mpg hwy with it on my 68 Dart.

Give it a shot!

Lou

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Home of Slant6-powered fun machines since 1988

Wow, thanks for the great insight Lou. Im definetly not gonna be out
nothing by trying it. I'll try and see what I can come up with- assuming
it dosent need a complete rebuild. But even if so that should be fairly
easy. I run the offy intake as well, I cant say enough good things about them.
Keep it Slanted!! - Michael

Speaking of 50cc accel pumps, does anyone know why they're so much more expensive than the regular ones? At work we sell the smaller ones for like 5 bucks, but the 50cc's are $20! I would blame it on us being retarded (it wouldn't be the first time), but I see similar price discrepencies elsewhere as well.

featherduster i have got the spec from my holley book for a 0-4412-1 but it doint show the 4412-3 both are the 2300 series carbs so i would asume they would be close. I can gine you all the spec as for as rebuild kits jets pumper nozzle size if this wil help thanks Ron Parker









New Year New Gear

I also have a 2300 500 cfm (I thought it was a 350 but it is a 500)

I highly modified it (annular boosters, inteerchangeable air bleeds, etc)

I have tried many set ups, all of them requiring a lot of accel pump shot (more than the same carb on a 318...)

currently I have 52 jets with 10.5" Hg power valvle, .6mm high speed bleed, 1.35 mm idle air bleed, 2 1,25 holes one on each throttle blade. My pump is 30 cc but I feel like it could use more (or diffrent cam profile, she likes a lot of gas quick and lowdown and then it reacts nice, I guess that due to the reworked venturis)

I tried on a staged 2 bbl that worked great but required some tinkering that I wasn't able to do so I swapped back my good old 2300. reliable as an efi to me

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

I hjave been running the 4412 (500 cfm) carb since 1977, on my 170 engine. I honestly cannot tell you what parts are inside. It has been so long since I had it apart. Mine is mounted on a modified stock one barrel manifold. It is not on an adapter, the manifold, has been opened up to the Holley flange pattern.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225