Re: Advice on Engine
[Re: OldFart]
#2522783
07/16/18 08:53 PM
07/16/18 08:53 PM
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Joined: Jul 2011
Posts: 959 Chicago
PurpleBeeper
super stock
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super stock
Joined: Jul 2011
Posts: 959
Chicago
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Hey oldfart. Yes, I think that's what stumpy is saying.
If you don't have any bolts on the center of the rear end when you look at it from the back (no cover with bolts) , then you have an 8-3/4" and it will handle quite a bit of horsepower.
For gear ratio in the rear end, you have a couple ways to go. 1. There may be a little, thin metal tag on one of the rear end bolts with a number on it (the gear ratio). Sometimes they're missing. 2. If you believe the rear end is original, you can check the fender tag for a "rear end code" (D-something I think? D for differential?) Somebody who's sure chime in please. No code = "standard" rear end gear & you have to check online to see what's standard. 3. Lift up the rear of the car on jack stands, place a mark on the tire & ground, turn driveshaft by hand one revolution & count how many revolutions you got at the tire. Compare that number vs. possible gear ratios for that rear end & you can figure out what you have.
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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Re: Advice on Engine
[Re: OldFart]
#2522827
07/16/18 10:24 PM
07/16/18 10:24 PM
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Joined: Aug 2003
Posts: 43,204 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,204
Bend,OR USA
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Last edited by Cab_Burge; 07/16/18 10:25 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Advice on Engine
[Re: CSK]
#2522895
07/16/18 11:49 PM
07/16/18 11:49 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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X2 (keeps your numbers matching block). & Welcome aboard. Keep the heads/top end everything the same (& just enjoy the increased torque from the stroking). EDIT or get a 400 block & stroke it with an offset ground 440 crank (470 cubes) which wouldn't be prohibitively expensive & obviously keep your 383 stashed (this would minimize your down time). You'll feel the extra 100 cubes. with a B block (400) your exhaust system & ps/alt fitment on the front of the block would be the same. You could even keep the 383 pan/pickup.
Last edited by RapidRobert; 07/17/18 02:28 AM.
live every 24 hour block of time like it's your last day on earth
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Re: Advice on Engine
[Re: OldFart]
#2522912
07/17/18 12:34 AM
07/17/18 12:34 AM
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Joined: May 2004
Posts: 1,004 ohio
bbtrux
super stock
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super stock
Joined: May 2004
Posts: 1,004
ohio
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Im guessing as to what youre after , based on your post. Trans wise, a rebuild with the red (rv and plow , heavy duty style) clutches and bands , along with a trans go shift kit make the 'flite happy. Assuming local cruising , a 3.23 sure grip does all you need, maybe 3.55. Engine wise, for the money and expected power return , Id go cheap cast crank emissions era 440. Cast or forged pistons (hyperuetectics are a no-no in my book), 440 source aluminum heads with a going over by a good engine builder, and a lopey cam that falls short of needing a converter any more than 2,500 stall speed.Keeps your small inch matching number on the stand (even though im apparently one of the few 383 fans),and takes advantage of cheap easy cubic inch.
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Re: Advice on Engine
[Re: hyefatman]
#2522947
07/17/18 02:50 AM
07/17/18 02:50 AM
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Joined: Dec 2013
Posts: 4,680 Wichita
GY3
master
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master
Joined: Dec 2013
Posts: 4,680
Wichita
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Do not change anything. Your 383 2BBL Dual exhaust is just fine for that type of car. Do not trade reliability for performance. Nothing wrong with a 383 stock big block. In my experience you can do both.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: Advice on Engine
[Re: OldFart]
#2522956
07/17/18 05:17 AM
07/17/18 05:17 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Nice car, any pictures? I had a '68 4-door hardtop back in the 1980's. The car should have a 8-3/4" rear end and 727 transmission. Both can take alot of power. If in good shape, with a shift kit, can handle around 500 HP and even more with a few modifications. You can stroke the 383 to around 496" (actual size depends on bore oversize.) That is a 4.25" stroke crank. The 440 source stroker kits are good for the price. I haven't priced any of the fancier cranks, rods, pistons in 10 years, so not sure how the prices stack up? There are a bunch of aftermarket heads to choose from. For something not to crazy (Hydraulic Flat tappet cam?) I would look at heads that accept stock style rocker arms.
On the Milider and maybe easier side of things, there is a guy in Centennial, CO. who is selling a freshly rebuilt 440. I don't know anything about it, but it might be worth checking out?
Last edited by 451Mopar; 07/17/18 05:23 AM.
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Re: Advice on Engine
[Re: OldFart]
#2523075
07/17/18 02:41 PM
07/17/18 02:41 PM
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Joined: Feb 2003
Posts: 7,982 Scranton, PA
Montclaire
master
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master
Joined: Feb 2003
Posts: 7,982
Scranton, PA
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First off, "today's safety standards" have nothing to do with what you are proposing. My advice would be to not get in completely over your head (and budget) trying to make a Ferrari out of a Polara. I would basically copy the factory 383 used in the roadrunner - mildly hotter cam (degree'd in), 4bbl intake and carb, some gears and a ~2400/2500 stall torque converter. You should already have pistons rated around 9:1 compression which is fine with today's gas.
Honestly, I know what your post says, but reading between the lines it sounds like you would be more than happy with a warmed 383. The 727 can easily be built to handle 500HP with no issues (you will be nowhere near that) and you should have an 8 3/4 rear which is also bulletproof for your combo. Factory HP exhaust manifolds will work nearly as well as headers at that power level and will be less problematic.
Last edited by Montclaire; 07/17/18 02:42 PM.
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Re: Advice on Engine
[Re: OldFart]
#2523178
07/17/18 05:18 PM
07/17/18 05:18 PM
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Joined: Nov 2006
Posts: 2,255 IL
furious70
top fuel
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top fuel
Joined: Nov 2006
Posts: 2,255
IL
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how much highway driving vs in town cruising? If you're rarely out on the interstate, I would agree gearing it is by far the easiest thing to do to make you giggle around town.
70 Sport Fury 68 Charger 69 Coronet 72 RR
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