Ok, here's the debate of the century: 383 or 400 chevy!! Cast your vote and reason - Page 6 - Hot Rod Forum : Hotrodders Bulletin Board
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View Poll Results: What's the better motor?
400 SBC 214 45.63%
383 SBC 160 34.12%
Bore your 383, get a 388 22 4.69%
They're equally good street motors 73 15.57%
Voters: 469. You may not vote on this poll

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  #76 (permalink)  
Old 05-22-2004, 05:23 PM
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hmmm I don't know if I agree with that. What's the point of making 500 hp just a tad easier (its not hard to do with at 383 btw) and risking blowing teh block. 500 horse is 500 horse regardless of the bore size.

K

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  #77 (permalink)  
Old 05-22-2004, 05:57 PM
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there's nothing wrong with a 400 block! the 4 bolt main 400 blocks sometime will crack in the main webbing. the use of main stud's help's reduce the likelihood of cracking in the main webbing. that's just about the only drawback. the Siamese bore's are stronger than a 350's. just look at the bow-tie blocks, rocket blocks, & most any other after market block on the planet.

with all thing's being equal, a 400 "will" out run a 383. more inch's means more power! you will have to do more to the 383 to get the same power out of it.
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  #78 (permalink)  
Old 05-22-2004, 08:06 PM
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Quote:
Originally posted by 406 ss monte
there's nothing wrong with a 400 block! the 4 bolt main 400 blocks sometime will crack in the main webbing. the use of main stud's help's reduce the likelihood of cracking in the main webbing. that's just about the only drawback. the Siamese bore's are stronger than a 350's. just look at the bow-tie blocks, rocket blocks, & most any other after market block on the planet.

with all thing's being equal, a 400 "will" out run a 383. more inch's means more power! you will have to do more to the 383 to get the same power out of it.


not nessasarily, it depends on the combo... because you have 1200 cubes doesnt make it fast...

I have heard of mountain motor's in excess of 700 cubes, yet the fastest cars on the planet are a measly 500 CID


there is more to making power than cubes, but it does help an awful lot....

the best way is to race em, if two guy's want to try it, Id love to hear the outcome...



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  #79 (permalink)  
Old 05-22-2004, 08:14 PM
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hmmm... I don't know If I'd follow that argument very far 2wild. It is a fact that more cubes is more power.

It is interesting that GM stopped using the motor so suddenly, and never re-introduced it even when they used the 350 technology so far into the 90's. I wonder why?

K
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  #80 (permalink)  
Old 05-22-2004, 08:43 PM
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In the seventies there was a gas shortage and Chevy thought that 400 sounded like a big block gas guzzler. The car companies go by what the customer believes to be true whether it is true of false. Just like with shift kits. I read something from a link yesterday that talked about how transmission shifts are made smoother from the factory because customers think smoother easier easier on the trans. Even though that is not the case.

Look at the Dodge commercial. Their best selling point is the Hemi. They are appealing to the guys that don't really know much about the Hemi. If they did, they would know that the Hemi is 1950s technology. I know the new one isn't the same, but in my opinion, Hemi isn't anything to brag about. Unless of course you are selling a vintage auto that happens to come from the factory with one in it.

Back to the 400. Most people have misconceptions, and don't know what they are missing when it comes to our application (hot rods and fast cars). The same goes for the people in the seventies that didn't know about it or express the demand for it then.
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Old 05-22-2004, 08:47 PM
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No matter what you do to a 383 a 406 can do it better.The 500 inch prostock engine comparision is weak too.At 2350# a 500 inch prostocker turns 9500rpm in the lights to go 6.70's.At 2450# a 700" IHRA car runs 6.50's at 8000rpm.That may sound high,but that is the difference between getting 20 runs out of your valvetrain and getting 200 runs out of it even ith the same cam profiles.
If all else were equal a 400 would make slightly more torque and about the same horsepower as a 383 but the rpm range would be about 250rpm lower.Now if you added better heads and a bigger cam to the 400 you could make more power at the same rpm's as the 383.I say bite the bullet and go for at least a 421.
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  #82 (permalink)  
Old 05-22-2004, 09:54 PM
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406

I've never posted here before, But have been reading here for a year or two. And never intended to post untill I seen this thread. My vote is definetly for the 406. I've built 5 of these motors over the years, 2 race motors 2 street motors, and the one I'm currently running now, thats just a every day cruiser in my 85 4-wheel drive pick up. I've never blown one up, and only had 1 to run hot. not over heat just run hotter than your standard 350 and thats because of a scrawny little radiator. The 406 I run now thats in this 6000 pound 4x4 with a tool box thats loaded full of tools will flat scream. It's bored .030 with flat tops, stock cast crank, stock 5.565 rods, 64cc heads(w/steam holes) 1.94 1.5 valves, lunati 224, 224 dur. .460,.460 lift cam, roller tip rockers, an aluminum intake from a chevy zz4 crate motor, headers, Q-jet and 2 1/2" exhaust with flow masters. It has a aluminum radiator w/2 1" cores and a electric fan thats rarely ever turned on, even in 85 degree wheather. I've cranked this motor 6000 many times and has 13,000 miles on it since I've rebuilt it. and it will absolutly fly. I've pulled our race car with it, and you can definitly feel the tourqe, and I hot rod it all the time and you can feel the horse power. So I see no reason what so ever why someone would want to build a 383 unless it was just an absolute have to case, due to the parts they have on hand. once again. (THERES NO REPLACEMENT FOR DISPLACEMENT)
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  #83 (permalink)  
Old 05-22-2004, 09:59 PM
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Or if you can't find your 383 parts laying around...
(THERES NO REPLACEMENT FOR MISPLACEMENT)
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Old 05-22-2004, 11:24 PM
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I think the 400 wins. Even if it does have strength issues (debatable) you still want to go with an aftermarket block when exceeding 500 hp anyway, so really, what difference does it make. I don't believe the cracks about the cooling either. I figure this way, if you had two motors sitting in the garage, fully built, a 383 and 400 that were identical, which one would you drop in the ride?

I'd drop the 400 in, but that's just my opinion. Good thread, good info. I'm convinced.

K
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Old 05-22-2004, 11:48 PM
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They are awesome for making big power cheap,sure,there heads cracked,but so did all the other small block heads with bigger valves from the same era,the answer to why it was discontinued is the same answer the 305 was produced. The only flaw I see for certain,which isn't that big of a deal,was the rod length,If your buying pistons anyway,just use 350 rods,its not like they're hard to find or expensive,400 all the way,to the gas station.
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Old 05-23-2004, 08:42 AM
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I have heard of mountain motor's in excess of 700 cubes, yet the fastest cars on the planet are a measly 500 CID

Pro Stock? hell no, I was talking about TOP FUEL
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  #87 (permalink)  
Old 05-23-2004, 12:31 PM
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there's a big difference between a mountain motor, & a top fuel motor. that has nothing to do with a 383 v/s a 406. i said if the two motor's are built identical , the 406 will out power a 383, just because of the bigger bore, & the 26 more cubic inches. i'm not saying a 383 can't be built to out run a 400, hell you can do it with a 283, but look at how much harder the 283 will have to work to do it. cubic inches means power. i'm not saying the 406 would smoke the 383 if their built identical, but it would have around 15-20 foot pound's more torque, & about the same in horse power.

1 hp per cubic inch = 26 more horse power right off the top
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Old 05-23-2004, 12:45 PM
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Id Just Like TO Mention how a 427 dominates a 454 maybe the case isnt the same here i dunno but personaly im building a 383
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Old 05-23-2004, 01:24 PM
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if the 427 out does the 454, it's because the 454 wasn't done right.
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Old 05-23-2004, 03:25 PM
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on a 1/4 mile a 427 will smoke a 454 even if there built exactly the same the 454 takes a while to get its full potential has to wind up a bit
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