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Re: Stock appearing 425hp 383 possible?
[Re: HPMike]
#1319662
10/27/12 09:23 PM
10/27/12 09:23 PM
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Joined: Jan 2003
Posts: 14,497
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,497
So. Burlington, Vt.
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Quote:
An honest 425 horse on a legit dyno with a 10:1 383, exhaust manifolds, iron heads, and that intake is no easy feat...Not saying it can't be done, but it won't be like falling off a log. 
MB
its not like falling off a log......but is definately doable.
my 383.....
.030 over, TRW's, 9.8 actual CR, RPM intake, pocket ported 346's(about 260cfm), Holley 750 carb, HP manifolds, custom solid lifter cam(.550 lift)........made right about 420hp at 6300rpm on pump gas.
in retrospect, i think the cam had a tad too much duration as the TQ number was only a bit over 420 ft/lbs.
i think a little smaller cam would have boosted the tq numbers in the mid-range.....and may have carried that up into the upper rpms well enough to yield a few more HP as well.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Stock appearing 425hp 383 possible?
[Re: Slant6pak]
#1319663
10/30/12 05:16 PM
10/30/12 05:16 PM
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Joined: Jun 2003
Posts: 50
Mesa, Arizona
az426hemi
member
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member
Joined: Jun 2003
Posts: 50
Mesa, Arizona
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Quote:
Thank you to all who have replied. Below is the reason I don't want to build a stoker. Again I don't even have an engine right now... if I wanted more cubes I could simply locate another 440.... I want a faster revving engine paired to a nice manual trans that pulls strongly through the gears. My hp goal is general, if I make awesome if I get close that is fine as well. I'd be content with a stock 383 if I didn't feel I could improve its power for not much more money that a stock type rebuild and head work. I have had my fair share of torque monsters... I'm tired of replacing tires. Quote:
[quote} What’s not to like about the 383? It seems that these engines have fallen somewhat out of favor in recent years as attention has turned to big blocks of ever increasing cubic inches. For a moderate investment, a 383 can be built into a sweet high-revving powerhouse. Study the 383’s numbers compared to the popular engines of the competition. The 383 carries a bore and stroke of 4.25”x3.375”, while the 396 Rat had a embarrassingly undersized bore of 4.094”, and a 3.766” stroke - as long of an arm as a 440. At the Ford camp, the 390 was even worse, with a bore only slightly bigger than a 340 at 4.050”, and again a 440ish stroke length of 3.780”. The 383 was a thoroughbred by comparison to the competition’s similarly-sized big blocks. In fact, the FE Ford fan’s coveted 427 block had less bore diameter than the dirt-common Mopar 383. Even the Chevy guys’ big guns, the 427 rat and the 454 had bores no bigger than Chrysler’s 383. You won’t see Ford or Chevy fans passing up 427 FE's or 427 and 454 Rats, but we tend to walk by those 383s with nary a second look. Why? We decided to explore the 383’s hidden potential. Anyone who remembers the 383 equipped musclecars knows that these engines can run. Garden variety 383 RoadRunners, Superbees, Challengers, ‘Cudas and A-bodies vastly outnumbered the more exotic Hemi and Sixpack cars back in the day, and these 383 cars contributed far more to the musclecar mystique and legend than they are given credit for today.
I too wanted to build a high revving, solid lifter 383 4 speed car. The best engine that I built almost 40 years ago after high school was a 396/375hp 55 Chev. Sweet combo. I wanted to duplicate that performance with a 383. So my current project is a 64 Dart with a 383 4 speed and a Dana 60.
The engine is about to be assembled. It has KB400 10.5 pistons, H beam rods, a main cap girdle, Stealth heads with Stage 1 porting by Muscle Motors, .528 cam, RPM intake, Bigs 750 Holley, and HP manifolds.
Can't wait!!
Mike
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