Re: 10 to1 383 or 8 to1 440?
[Re: Jimbo]
#1328161
10/29/12 04:40 PM
10/29/12 04:40 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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The 440 would have way more cubes and a non flat cam & as you know the RB block being 3/4" higher up at at 45 angle would take some different brackets in the front and maybe exhaust pipe mods & check carb height and you'll like a change  but at an advertized 8.4 the actual CR may be in the sevens. As said I'd put a new cam/lifters in the 383 (Summit-$60) & gain some renewed power while you rebuild the 440 properly. That way your making/enjoying constant progress
live every 24 hour block of time like it's your last day on earth
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Re: 10 to1 383 or 8 to1 440?
[Re: RapidRobert]
#1328162
10/29/12 06:01 PM
10/29/12 06:01 PM
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Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
DPelletier
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
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Interesting question and the real world answer has a bunch of variables, but looking at it theoreretically, most sources agree that a 10 point bump in compression (going from 8 to 9:1 for eg.) is worth about 3% in power so going from 8 to 10 would be maybe around 6% (though the effects of increased compression aren't linear).
....the 440 is 15% larger than the 383 so the 6 percent drop in power will be overshadowed by the increased displacement...all other things being equal.
Dave
1970 Super Bee 440 Six Pack
1974 'Cuda
2008 Ram 3500 Diesel
2006 Ram 3500 Diesel
2004.5 Ram 2500 Diesel
2003 Ram 3500 Diesel
2006 Durango Limited
[url] http://1970superbee.piczo.com [/url]
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Re: 10 to1 383 or 8 to1 440?
[Re: DaytonaTurbo]
#1328165
10/29/12 06:59 PM
10/29/12 06:59 PM
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Joined: Jan 2003
Posts: 75,082
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,082
U.S.S.A.
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Quote:
Also, if you actually calculate the numbers, you will find a stock piston 383 is nowhere near 10:1 compression. So in reality you are probably more like comparing a 7.8:1 compression 70's smogger 440 to a 383 that has around 8.5 compression.
Depends on what year/flavor the 383 is , a 68/69 383 4 bbl , 330 or 335hp , compression is a measured 9.2ish ...
Either way the incorrect way to fix a lobe going flat is to just stab in another cam ...
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Re: 10 to1 383 or 8 to1 440?
[Re: 1_WILD_RT]
#1328166
10/29/12 07:08 PM
10/29/12 07:08 PM
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Joined: Jan 2008
Posts: 4,255
Canada
WO23Coronet
master
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master
Joined: Jan 2008
Posts: 4,255
Canada
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Quote:
Quote:
Also, if you actually calculate the numbers, you will find a stock piston 383 is nowhere near 10:1 compression. So in reality you are probably more like comparing a 7.8:1 compression 70's smogger 440 to a 383 that has around 8.5 compression.
X2 440 all the way. Yeah rebuilding the 440 right would be nice but sometimes u just have to use what u have to get going, plus, if the cam all of a sudden went flat, the engine would be contaminated with metal filings and have to be yanked and cleaned anyway. If its a gradual thing u could get away with recamming the 383.
Put a Summit cam in the 440, drop it in and giver
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Re: 10 to1 383 or 8 to1 440?
[Re: Jimbo]
#1328168
10/30/12 04:24 PM
10/30/12 04:24 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
thanks for the response guys, first off, the 383 is a 66 hi perf engine that came from a satellite. If i went with the 440, i was planning on doing a basic re-ring job, i have a set of 452 heads sitting here that came off a 17k motorhome motor that spun a bearing. money is tight, so this is a limited budget project. I'm just wondering if the payoff will be worth the extra money and time.
the closed chamber heads on the 383 would be a beter option as they would give you some more compression. The 440 wil have gobs more of torque and wil pull harder, faster than the 383.
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Re: 10 to1 383 or 8 to1 440?
[Re: Jimbo]
#1328169
10/30/12 05:12 PM
10/30/12 05:12 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
thanks for the response guys, first off, the 383 is a 66 hi perf engine that came from a satellite.
Doesn't matter. Factory compression ratios were a lie. At best your 383 is 9:1 compression. Putting those open chamber 452's on there will drop you down even further. I've never owned a 383 but I can tell you that a 70's smogger 440 is a dog unless you put in some decent rear gears and a torq converter.
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