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Author Topic:   377 vs 383 Street Stock Motor
WesternAuto17
Dirt Freak

Total posts: 248
posted January 24, 2002 03:56 PM
For a street stock, what is the difference between a 377 and a 383? I'm looking at Jr Motorsports shortblocks and wonder what the advantages of each are. Also, what about a 406, any disadvantages to a 406? I want to get as much power as I can for the money, but I don't want to sacrifice reliability.

[This message has been edited by WesternAuto17 (edited January 24, 2002).]

AC156
Dirt Freak

Total posts: 295
posted January 24, 2002 04:04 PM
A 377 is a 350 crank in a 400 block. A 383 is a 400 crank in a 350 block. I think that the 383 will have more torque than the 377. But the 377 would rev higher.

[This message has been edited by AC156 (edited January 24, 2002).]

istock59
Dirt Freak

Total posts: 237
posted January 24, 2002 08:21 PM
WesternAuto17, what kind/size of carb are you feeding that motor with? If you're talking about an IMCA Stockcar, with it's dinky 350 cfm carb, well, that changes things...


WesternAuto17
Dirt Freak

Total posts: 248
posted January 25, 2002 08:47 AM
3000 lb Monte Carlo with 700 cfm dbl pumper with a single plane Weiand, Double hump head with 2.02/1.60 valves backed up by a powerglide and a gear between 5.88 and 6.00 on a fast 1/4 mile.

Any other questions?

istock59
Dirt Freak

Total posts: 237
posted January 25, 2002 10:41 AM
With that carb and intake combo, you can't beat CI in my opinion. I'd go with the 406.

sixwillwin
Dirt Freak

Total posts: 215
posted January 25, 2002 07:07 PM
1/4 mile? 406 or 383 for sure. Alot more torque than 377 or 355. But, please put some gear in the car. At 3000#, 6.33 should be the leaset gear you would want to run. We run 6.20 - 6.50 on 3/8 milers.

devil wrench
Dirt Forum Racer

Total posts: 100
posted January 26, 2002 12:48 PM
If you've got a motor with a pile of torque, you don't need to rev the snot out of it. Stick with your gears and see how it does, then change if needed. Every track is different, and with yours being a "fast" 1/4, the 6s are probably just fine.

Wild Bunch Racing
Dirt Full Roller

Total posts: 53
posted January 26, 2002 07:22 PM
If I was you I would run the 406 because of the torque advantage it has over the other engines. What RPM range are you seeing with that gear combo?

WesternAuto17
Dirt Freak

Total posts: 248
posted January 28, 2002 01:56 PM
Well, the RPM is kind of a problem b/c I'm building a new car. The 5.88 to 6.00 is kind of a guess.

My old car had a 3.50 but I ran in 1st (1.86 glide) so I had a 6.51. With that combo, my old 350 motor was 5500 to 6500. The track is egg-shaped, so you exit turn four with a lot of momentum, but need torque to get off the flatter, tighter turns in 1 and 2. With a Turbo350, I had to shift.

With a 383 or 406, I'd really like to keep rpm's down closer to 6000. I really think that my track must be faster than a typical 1/4 mile b/c all kinds of people on this forum are saying to run a 6.20 to 6.50, but that seems too high. I didn't like it being that high befor.

Wild Bunch Racing
Dirt Full Roller

Total posts: 53
posted January 28, 2002 09:08 PM
Well I think you should run the 406 and 6000 is a great rpm to run if you have the right cam and heads. Your gear ratio is a good one to run especialy if your track get dry slick like ours. Happy racing.

dirtracers
Dirt Full Roller

Total posts: 74
posted February 04, 2002 05:31 PM
You will need about a 620 gear my brother ran a 633 with a 400 and had been running a 3 9/16 doing about 6000 rpms put the 400 in it and blew it up first night

RangeRover
Dirt Maniac

Total posts: 174
posted February 04, 2002 10:15 PM
If your cam, heads, and other combination of components create maximum torque somewhere between 5500 and 6050, it's useless, even detrimental, to try to turn the motor higher. You'll just wear it out faster or break it sooner. I have tried all kinds of combos and I like the 383 the best: It smokes the 350 and 377 in torque and you don't need to spin it so high, for which it will last longer. Furthermore, you don't have the cooling problems associated with the 406. Since the production of the 383 stroker cranks by aftermarket companies, it's now very reasonable to go this route, too.

Each of the above-mentioned engine combos has, can, and will win, but I have had success with the 383.

One more thing, an internally balanced 383 stroker passes very easily for a 350- no tell-tale block or harmonic balancer. What's your competition running? Hmmm.

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