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Old 01-22-1999, 05:10 AM
Bob
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I have a 70 Coronet with a 383 2 bbl and a 727 torqueflite. I am planning on installing a 6 pack using the 440 carbs and the mopar 363 6 pack intake. I am also going to add a cam from a 440 6 pack and a 3 bolt timing chain for it. I am looking at buying a 2400 stall speed torque converter and 3:55 gears with a sure-grip differential. I am doing most of this for cosmetics more than performance, and I want the car to drive well in town, with some occasional highway driving. Would the 3:55 gears and the 2400 torque converter be ideal for this?? Thanks in advance for any advice.
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Old 01-22-1999, 06:36 AM
Dave
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3.55 gear will give you a 60 mph cruise rpm of about 2900(or so) which is far from radical and is also above your stall speed. The worst thing you can do is run a transmission below its stall speed,under load,for long periods of time. It's a formula for baked band soup. The most important thing you should do is get a good transmission cooler.
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Old 01-24-1999, 12:34 AM
Orange Bee
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Bob,
A few important things to remember about six-packs (especially on a 383). Holley 2 bbls are flow rated at a different pressure drop (4 inches of Mercury) than 4 bbls (1.5"). What this means is that a six-pack really flows about 950 cfm even though the numbers add up to 1350 (two 500 outboards and a 350 center). Good ignition is a must - Get the MP electronic distributor. A gold box (yes it does work fine on the street) or MSD 6 and the big yellow Accel coil will help it run much smoother at all RPM's. The stock six-pack cam had the same specs as the 383/440 magnum cam did, so it's not much of difference from what you have. The main difference was the low taper profile so that the stiffer vavle springs wouldn't flatten the lobes. With the six-pack on, you will really feel the difference going up the the .474 or the .484 (my personal favorite) The .484 makes for a VERY driveable combo with the looser converter and 3.55's. If you check out the cam test info in the Mopar Chassis book and use the formulas in the back to calculate hp, you'll find the .474 cam makes 15 more hp than the stock magnum cam, but the .484 makes 40 hp more than the stocker. A good way to get a looser converter is to get a stock replacement for a 68-70 340 or 383 for the 727. It should stall to about 2000 with your combo and cost about $70! If you look at your stock converter (11 3/4 ") the ring gear should have very little room (maybe 1/4 to 3/8 of an inch before the converter body) whereas the factory hi-stall (10 3/4") will have about 3/4" wide flat ring gear area before the converter body starts. What size tires will you use? I have an Excel spreadsheet to help you calculate rpms, gears, tires etc. E-mail me if you'd like it. Plan on getting a secondary spring kit from holley to tune the carbs. You can mix the springs in the front and rear carbs to fine tune your setup. Good Luck!
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