I have a 3200 lbs car, plus me (I'm 300 lbs 6.5) and 3.07:1 dana 44 (8 1/4?) rear end. I want to get some more seat of the pants power feeling, plus my mill seems to like to rev. A904 freshly rebuilt tranny. Any suggestions about rear end ratios? I do mixed town/highway driving, but she seems to stop screaming over 3000 rpm. (I have a very annoying BVRROOOOOOMMM noise when I step on it at certain rpm/speed trying to gain speed fast (like when going from 50 to 60 at wot or near it).

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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.

More gear will help, maybe a 3.23 (or 3.21 for your 8.25). If your engine likes to rev, maybe a 3.55.

i can't get a 3.23, but I can easily get a 43/13 (3.31)
Think I'm sticking to that asap.

and don't on me...

I still fit under the dash to fix and/or add wiring, solve heater problems, etc. You should take a look at people whom works at my garage when they see a 6.5 ft 300 lbs human (?) being crawling under a dash, or underneath a car.... they almost can't believe that I'm going to get up again.

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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.

So 4cm weighs 84lbs?
3,31 sounds nice!

not EVERY 4 cm weights 84 lbs. I wish.,...

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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.

If your engine stops screaming at 3000, a taller rear gear will not help you very much. Is your cam degreed? What carb/exhaust?
3.31 is probably the max you would want.

Lou

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Home of Slant6-powered fun machines since 1988

How come? I thought that if I helped the mill to rev up sooner (by shortening the rear axle rtio) My broooom will move down, and/or dissapear since it seems to happens a lot when uner load. My dist is recurved, 15 initial 28 total mech 8.5 vac pod, not too "fast" curve, I don't know nuttin about degreeing a cam. A friend installed it and though it was a "custom" peppy advertised cam, I feel like its retarded (speaking about time) my carburetion is one holley 1920 derivative (1922, larger venturis, piston type accel pump, larger throat, larger fuel bowl, designed in argentina to replace the carter bbd, flows about the same that supersix carters. My ex is true duals (no balance pipe or whatsoever, with one medium sized muffler on each branch. Primaries are 1 3/4 decondaries are 2".

I'm about replacing my 1 barrel with 1 holley 2300 350 cfm, all doctored up, works as heaven in another freind's car that has pretty much the same mill that I have. No intake heating. I tested that carb on my car and it was nice, but then I spent some months working in the intake itself doing some mods (basically removing chunks of cast iron that could resctrict intake flow) Fuel consumption wasn't so diffrent than my 1 barrel, but power felt like a nice stock V8 270 (so is the ex sound)

What would be your input, lou?

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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.

OK, so your carb will probably be the main limiter. That 350 will help a lot. Also, headers/duals and cam with a 1bbl will probably make it run out of breath at lower RPM than with stock cam/exh. Depends on jetting too.

If the carb does not give you a lot more RPM pull, then the cam could be advanced (more low end, less high) rather than retarded.

I say do the carb first, then see how it revs. If it's a peppy cam with a well tuned 350 carb, you should be good up to at least 4500 RPM if it's degreed right.

On my 64, I went from 2X1 offy to an Edel 600 carb and went from 15.7 to 14.9 right away and gained 1000 useable RPM on top. Even 2 1bbls were not enough to rev much past 5000...

Lou

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Home of Slant6-powered fun machines since 1988

Thanks lou, you're kinda confirming some of my ideas about that. I'm only one inch from throwing in the 350... the only reason I havn't yet is that I kinda come and go between installing the 350 (wich by the way is a nicely street fighting modified carb wich ain't too rich or wastes gas) and installing 2 1bbl. So if I got this straight... (duh... lemme check) If I do the carb swap and my car ain't gains grunt, my cam may be advanced rather than retarded. So you're prolly right, I might wait till I swap induction and see what happens.

Talk to you as soon as I get my hands dirty and maybe my language too.

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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.