Ok, here's the debate of the century: 383 or 400 chevy!! Cast your vote and reason - Page 5 - 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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  #61 (permalink)  
Old 02-07-2004, 06:39 PM
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Thats says it all. End of this one.
No problem with 400 motors except for the ones that are built without blueprinting and having the correct combo.

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  #62 (permalink)  
Old 02-07-2004, 06:54 PM
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stroked 350 or bored 400?

I opt not to bore my 350/377 but used the steel 400 crank and roller cam with roller rockers with 2.02 reworked heads. My 400/406 I had punched and I have a good set of those damn 400 heads reworked. When I put these into the chevelles/one64 and one65, I will let you know what the difference is. I say build what you have to suit your needs, who cares what anyone else thinks anyway??


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  #63 (permalink)  
Old 02-07-2004, 08:23 PM
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the 377 rocks
 

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i'm new to this GREAT SITE!!!! i've got a 68 camaro ss clone with a 400sbc in it with 350 crank and rods bored .030 , so do ihave a 377 or a 383??????????
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  #64 (permalink)  
Old 02-07-2004, 08:34 PM
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That would make 383 assuming a .060" over bore.
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  #65 (permalink)  
Old 02-07-2004, 08:54 PM
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the 377 rocks
 

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i just bought the car and it's sick fast but the guy i got it from didn't know anything about it, seeing that he had it 6 weeks. and it has a m21 and he's an auto man , reason for selling, i thought it went both ways, a350 with a 400 crank androds is a383. and a 400 with 350 crank and rods =383 jeff
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  #66 (permalink)  
Old 02-07-2004, 09:01 PM
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I guess it does depending on the over bore size.
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  #67 (permalink)  
Old 02-07-2004, 09:26 PM
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400+0.030/350 crankshaft=377 inches

350+0.030/400 crankshaft=383 inches
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  #68 (permalink)  
Old 02-07-2004, 10:01 PM
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[QUOTE
As far as leaving better, what kind of arguement is lack of low end torque! If you tune your suspension right, run the appropriate tire and rim, and have then proper traction aids, that is when you can say your car leaves harder. Based on the lack of bottom end arguement you might as well run a Chevy 6 or 4 cylinder, right? 2 hole spacers, ignition and carb tuning can help if you don't want to mess with the correct ways of tuning your launches. [/B][/QUOTE]

The argument is I leave QUICKER ..

With a 2240 lbs street car on street tires.............the 350 is better...for me.......

My car carries 6.4 pounds for every cubic inch........If you engine is 406....your car will need to be lighter than 2600 lbs to match mine. My 350 is over 430 HP....... so if be ever meet on the street...



THIS IS WHAT YOU WILL SEE....


I come out to LA ever so often........we will see.......


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  #69 (permalink)  
Old 02-07-2004, 10:38 PM
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a few points have been made & no one even noticed. a 377 = 400 block & a 350 crank. how many people have you ever heard of having over heating problems with a 377? i've never heard anybody complain. the difference is the stroke. more stroke = more heat = more power (to a degree any ways). the 377 is a high winding Sum-*****, that tells me a lot about the 400 blocks integrity. my 406 runs a little hotter than the 327 i had, but it makes crap loads more power! if you build high horse power engines, your going to build a little more heat. same goes for both the 383 & 406.
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Old 02-08-2004, 12:43 AM
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Quote:
Originally posted by Deuce
[QUOTE
As far as leaving better, what kind of arguement is lack of low end torque! If you tune your suspension right, run the appropriate tire and rim, and have then proper traction aids, that is when you can say your car leaves harder. Based on the lack of bottom end arguement you might as well run a Chevy 6 or 4 cylinder, right? 2 hole spacers, ignition and carb tuning can help if you don't want to mess with the correct ways of tuning your launches.
The argument is I leave QUICKER ..

With a 2240 lbs street car on street tires.............the 350 is better...for me.......

My car carries 6.4 pounds for every cubic inch........If you engine is 406....your car will need to be lighter than 2600 lbs to match mine. My 350 is over 430 HP....... so if be ever meet on the street...



THIS IS WHAT YOU WILL SEE....


I come out to LA ever so often........we will see.......


[/B][/QUOTE]

My arguement is that you would leave even quicker with the 400. I could make my 400 faster if I wanted to, but I drive it to work everyday. Which brings us to my other point. 400s will idle better and be more streetable. I could make my 2,400 lb. 400 hp 5.0 a little faster if I wanted too. If I wanted I run a blown 600 cube mountain motor on any of my cars. All of that isn't going to change the fact that with adequate traction and everything equal, the 400 will be faster than the 350.
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  #71 (permalink)  
Old 05-22-2004, 01:19 AM
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400
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  #72 (permalink)  
Old 05-22-2004, 10:16 AM
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All else being equal, a 400 would win, hands down. More cubic inches = more power. The added bore of the 400 also translates to less valve shrouding, thereby increasing breathing over the 383. Look at it this way: the 400 is a .125" (at least) overbored 383. The only reason one might choose a 383 over 400 is if one has a 350 block to start with and can't afford to or can't find a 400 block.


tom
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  #73 (permalink)  
Old 05-22-2004, 10:38 AM
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Im surprised this thread came back! I definitely think the only difference in choice between the two would be which parts you have. It doesn't make economic sense to get a 400 block if you have a nice 350, 4bolt at your disposal. The 400, as I've read, has many rumors surrounding it concerning cooling. I don't think any of them are true. One issue that I have heard about with the 400 blocks is that they're not very strong. Perhaps certain 350 blocks would be stronger if you're deciding to run boost or whatnot.

K
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  #74 (permalink)  
Old 05-22-2004, 01:45 PM
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a 383, 5.7 or 6" rod? a 400, a 5.7" rod or stock? just because its a 400 doesnt make it faster, or make more power, and why in the world would you build a 383 like a 400 or vice versa, a 383 can easily out run a 400 and also vice versa, there are many, variables, so I say build whatever you have, Im a big fan of the 400SBC and the 350 stroker 383, the actual HP difference between the 2 built the same is relatively small...add headers to the 383 and they would be about the same...soooo, whatever....you guy's think, but I have experiance with these also...

add more gear/converter to the 383= bye by 400

its how you build these motors that make the difference...the 383 can make serious torque as well, its just your preferance and if you race there is no replacement for displacement...on the street well, sometimes thats in question...

gas mileage, VE all play a role in selection, if your head optons are limmited you could build a better breathing 383 over a 400, the 400 is seriously undervalved and if and when its true potential is reached these motors are totaly big block eating monsters...

so flip a damn coin and be happy with your choice...

2wld4u
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  #75 (permalink)  
Old 05-22-2004, 01:46 PM
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The larger bore of the 400 wins over the possible extra strength from the 350 block.

Last edited by lluciano77; 05-22-2004 at 06:17 PM.
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