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350 vs 383

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Old Jan 13, 2005 | 11:07 AM
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Mike1's Avatar
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From: Mt Juliet, Tn
350 vs 383

All things being equal what would the HP/TQ numbers be with a 350 vs a 383? Or how much more would I get from a 383?

Thanks,
Mike
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Old Jan 13, 2005 | 11:47 AM
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five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
For whatever reason, 383's seem to put out a little more than the ratio of displacement. But, that ratio is a good place to start.
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Old Jan 13, 2005 | 02:27 PM
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From: Buford, GA
Car: 89 RS
Engine: 6.3L Megasquirted HSR
Transmission: T56
Axle/Gears: 3.70 Posi 9 bolt
To get more out of it, u gotta stroke it!

Youll get a lot more low end power with a stroker, seeing as how its essentially that, a STROKER. But, if u on a budget, a 350 wud suffice.

U can still build up a 383 to turn 7k, but with that longer stroke ull need to get some good main caps and rods do u dont break anything!
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Old Jan 13, 2005 | 04:58 PM
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From: Mt Juliet, Tn
So would I basically just get more torque and the horsepower be about the same as the 350 if I built a 383?
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Old Jan 13, 2005 | 06:02 PM
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five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
No, more torque means more horsepower, because HP = torque x RPM / 5252.
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Old Jan 14, 2005 | 02:23 PM
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From: Newark, DE
Car: '86 Camaro, '02 WRX, '87 K5, '67
Engine: 350 TPI, 2.0turbo, 383 in the works, 289-4BBL, 232, A-head 4-cylinder
Transmission: T56, 5-speed, 700R4, C4, T176, semi-auto 2-speed
Axle/Gears: 3.73, 3.90, 4.88, 3.55, 3.54, 7.00
If you're looking to spin 7,000 RPM you'd be better off with a 377. It's a destroked 400 (you use a 350 crank in the 400 block).

A 383 will make about 45 lbs/ft. more torque and have a broader, flater torque cruve than a 350. What was said about torque equals horsepower is dead on. A 383 won't be as rev happy as a 350 though. More rotating mass to get moving. A 383 is a street king though becuase of the torque. For the track the 377 is a hotter setup.
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