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Old 10-11-2007, 03:43 PM
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detroked vs stroked

Iv'e heard about and seen both sides, but which is an all round beter engine?
383 or 377? thanks

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Old 10-11-2007, 04:00 PM
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383 for torque
377 for hp
more that likely the 383 will make you happier on the street then the 377,the drag strip i would go with the 377.jmo
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Old 10-11-2007, 04:32 PM
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If you can do a 377, why would you not do a 400? Just asking.
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Old 10-11-2007, 04:36 PM
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Ill gladly second what nitro said. The 377 will have to be wound up to get the power. Usually ends up being more money all around, especially in the valvetrain department.
383 is more economical for street, but I would enjoy seeing a 377 roaming the streets.

Up to you and the thickness of your wallet.
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Old 10-11-2007, 05:16 PM
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If you have a 350block and a 400crank laying around then the 383 is your best choice. If say you've got a 400block and a 350crank laying about then the 377 is your best choice. Either engine will make very close to the same amount of power and torque in about the same rpm range.

If you were to build the ultimate high rpm racing motor the 377 with its shorter stroke and larger bore has a advantage of lower piston and bearing speed combined with room for larger valves.

In the street/strip environment one does not have a big advantage over the other when built properly. each is a 380ci+/- SBC motor, all said and done.
A 377 makes a particularly good street blower motor as it's easy to get a low pump gas friendly compression ratio using off the shelf parts.
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Old 10-11-2007, 05:20 PM
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Do some hardcore research about torque and stroke. The long-thought notion was that long strokes make more torque because of the longer lever involved, but in reality it makes very little difference. Take for instance a 455 Olds versus a 455 Buick. The Olds has the really long stroke, but smaller pistons, so although there is more leverage on the crank, there is less surface area in the piston. The overall net result is often very similar.

So, the real limiting factor in stroke is RPM limit. So, provided you can meet your power goals within the realistic safe rev range set forth by the stroke and other factors, more is better. I would understand if you choose the destroked 377 if you are specifically trying to make big power by revving to 7000, but for a sub-6000 street strip engine, more cubes will be the winner since they'll all spin that fast pretty safely.

I wanted so badly to make a 302, but I realized I can get the same power from a 383 at 6000 rpms as a 302 at 7500, and I got more torque out of the deal.
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Old 10-11-2007, 06:06 PM
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I pretty much agree with what has been said. But if you have a 400 block THEN BUILD A 400!

Jordon
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Old 10-11-2007, 07:26 PM
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there is no reason to destroke anything unless you are limited by class rules to a max cubic inch.

For the rest of us, bigger IS better
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Old 10-11-2007, 08:10 PM
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Quote:
Originally Posted by DeathRattle
The 377 will have to be wound up to get the power.
383 is more economical for street, but I would enjoy seeing a 377 roaming the streets.
Ditto what Curtis73 said. Remember that work equals force x distance. While a 377 has more area across the piston the force is applied for a shorter distance than a 383 that has a somewhat smaller area across the piston but that force is applied for a longer distance.

Yes both engines have areas in which they would be better suited than the but for most people the difference between the two is negligible and you'd be hard pressed to tell which was which on the street.

Assume 1000 psi of pressure.
The piston on a 377 has an area of ~13.6 square inches. That amounts to 13600 lbs of force pushing on the piston. Multiply 13600 by 3.48 (force x distance { i.e. stroke}) and you get 47328 ft-lbs

The 383 piston has an area of ~12.8 square inches. This would equal 12800 pounds of force acting on the piston. Multiply 12800 by 3.75 and you get 48000 ft-lbs of work. Factor in the six extra cubic inches one engine has and you'll see the difference is very small.

Having said that, I certainly wouldn't cannibalize a good 400 to build a 377 either. I'll take the extra 23 cubes.
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Old 06-22-2008, 09:22 PM
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i have a 350 with a 305 crank what would it make it and is it good for drag
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Old 06-22-2008, 09:53 PM
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That would make it an out of balance 350.
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Old 06-22-2008, 11:59 PM
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A 350 with a 305 crank.

Drag? Drag night?
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Old 06-23-2008, 11:10 AM
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Yeah you should throw that 305 crank into that 350 and see how much more power you get. Make sure you are familiar with the "negative horsepower to money spent" calculator
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Old 06-23-2008, 12:21 PM
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Just my 2cents. I would take the extra cubes anyday. 383's are so cheap to build i cant see not going with the extra cubes. There is no replacement for displacment. All other factor the same, larger engine wins every time.
BigBuick Joe
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Old 06-24-2008, 07:58 AM
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What you need is a 3.875 stroke. Then you can fuggeddaboutit.
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