383-350 Power differences.
Le Mans Master
Joined: Feb 1999
Posts: 6,172
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From: somers, ny
Re: 383-350 Power differences. (Corvette0096)
I have an LPE dyno sheet for that engine which made 445 fwhp at 5300 and almost 500 fwftlbs at 4200. Thats with a ported SR, 1.6 rockers and ported L98 heads. With this common combo your car should go 11.3s-11.4s in 1000ft air. A friend ran a couple of 11.teens with his....not sure of the DA but it wasn't killer. Maybe 0-500 ft.
My 350, same combo, probably makes about 390-400 fwhp and 430-440 fwftlbs. Gone a best of 11.62 in around -500 ft. Went 11.71 two weeks ago, in about 250 ft and i'm probably 75 lbs heavier than when i ran my best.
[Modified by ralph, 4:58 PM 11/5/2003]
My 350, same combo, probably makes about 390-400 fwhp and 430-440 fwftlbs. Gone a best of 11.62 in around -500 ft. Went 11.71 two weeks ago, in about 250 ft and i'm probably 75 lbs heavier than when i ran my best.
[Modified by ralph, 4:58 PM 11/5/2003]
Team Owner
Joined: Apr 2000
Posts: 27,818
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From: CT
383-350 Power differences.
383's aren't really e.t. engines. They're torque monsters. Torque gives you big mph(I know, you're one of those e.t. guys) I'd do a 420 if I could do it over again, but would also have to invest in a 9 inch after hookedup blew like 4 D44's.
Le Mans Master
Joined: Aug 2000
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From: Lost in the mountains of TN
Re: 383-350 Power differences. (Jay 383)
383's aren't really e.t. engines. They're torque monsters. Torque gives you big mph(I know, you're one of those e.t. guys) I'd do a 420 if I could do it over again, but would also have to invest in a 9 inch after hookedup blew like 4 D44's.
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: 383-350 Power differences. (Corvette0096)
Judging from dyno results ive seen and those ive seen on the forum before, probably about 40hp on average, with 50-60tq.
Team Owner
Joined: Apr 2000
Posts: 27,818
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From: CT
383-350 Power differences.
I should have clarified YES the higher the hp, the more mile per hour you can expect. Torque does have a great deal of assistance in getting the car quickly down the track.
Seriously Rich, with all the firepower here, I think you're in good hands as for replacing your existing engine with a screamer.
You could always copy Beach Bum's or Mine :) :cheers:
Seriously Rich, with all the firepower here, I think you're in good hands as for replacing your existing engine with a screamer.
You could always copy Beach Bum's or Mine :) :cheers:
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Pro
Joined: Feb 2002
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From: Houston Tx
Re: 383-350 Power differences. (Corvette0096)
To answer the original question, if you took an identically setup engine with the only differences being the displacement from 350 cid on one to 383 cid on the other, I wouldnt think it would make much more the 25 more rwhp but rwt would be up 35-45.
383's are only 33 more cid which is nice but could be more. Also , remember on larger displacement motors essentially the same cam will be more "mild" (you can go with a hotter cam with more displacement ) than it was in a smaller displacement motor. Also remember that the hp potential of the engine is essentially in the top end - the heads/cam/intake....more displacement generally gets you more low end and mid range (which IS very important) but not necessarily much more top end.
If I were going stroker , I would go at least 396 unless you are getting some special deal on the 383 or the $ difference is just too much. Hope that helps...... :)
383's are only 33 more cid which is nice but could be more. Also , remember on larger displacement motors essentially the same cam will be more "mild" (you can go with a hotter cam with more displacement ) than it was in a smaller displacement motor. Also remember that the hp potential of the engine is essentially in the top end - the heads/cam/intake....more displacement generally gets you more low end and mid range (which IS very important) but not necessarily much more top end.
If I were going stroker , I would go at least 396 unless you are getting some special deal on the 383 or the $ difference is just too much. Hope that helps...... :)
Drifting
Joined: Jul 1999
Posts: 1,337
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From: Brighton, MI
Re: 383-350 Power differences. (Shriker)
OK, here's my dilema. I have a good set of ported heads and an intake to match, 52 mm TB, a selected cam, long tube headers and exhaust, etc. I have a stock 350 shortblock to build, or a 383 shortblock. I've got the block and rotating assembly for both. With these given heads and intake to go on either motor, will I only see a 25 hp increase with the 383, or will the bigger cubes be able to make better use of the better top end comonents?
Le Mans Master
Joined: Apr 2000
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From: Manassas VA
Re: 383-350 Power differences. (Corvette0096)
I have a Lingenfelter catalog, and it shows a LT1 package with I believe the sr and the 219 cam. (auto LT1 got the SR intake) The 350 vers. is 410bhp/385 lbs-ft of torque. The 383 is 440 bhp/430 lbs-ft of torque. So I would say somewhere around 30hp. and 45fp. of torque difference. The L98 may be a little different but not much.
Melting Slicks
Joined: Jan 2002
Posts: 3,293
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From: Jackson MI
Re: 383-350 Power differences. (Corvette0096)
One thing that you have to remember is that for a 350 and a 383 you can't just throw the same cam in it and expect them both to be optimal.
You'll need a bigger cam for the 383 and you'll see bigger gains!!
You'll need a bigger cam for the 383 and you'll see bigger gains!!
Team Owner
Joined: Apr 2000
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From: CT
383-350 Power differences. (mn_vette)
One thing that you have to remember is that for a 350 and a 383 you can't just throw the same cam in it and expect them both to be optimal.
You'll need a bigger cam for the 383 and you'll see bigger gains!!
You'll need a bigger cam for the 383 and you'll see bigger gains!!
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Re: 383-350 Power differences. (Jay 383)
One thing that you have to remember is that for a 350 and a 383 you can't just throw the same cam in it and expect them both to be optimal.
You'll need a bigger cam for the 383 and you'll see bigger gains!! Not necessarily. Using the 219 as an example here, ralph, bob sebrowski and a few others have used the 219 in a 350 and it performed as well there as a 383(like mine). the 74219 is designed for a 350-420 cubic inch engine. That little cam works. :cheers:
You'll need a bigger cam for the 383 and you'll see bigger gains!! Not necessarily. Using the 219 as an example here, ralph, bob sebrowski and a few others have used the 219 in a 350 and it performed as well there as a 383(like mine). the 74219 is designed for a 350-420 cubic inch engine. That little cam works. :cheers:
[Modified by mn_vette, 7:32 PM 11/6/2003]
Drifting
Joined: Oct 1999
Posts: 1,722
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From: Gloucester Va
Re: 383-350 Power differences. (mn_vette)
Being a 383 owner I would have to say If I had ti to do over I'd gone super charger and gone with a 355. The 383 is nice but I've seen plenty of guys putting out the same numbers from 350's. A friend of mine was putting out 380RWHP out of a 350, 96 vette. A lot of the 383 LPE desings like mine are putting out that or a little more. But is the extra work, and $ wirth it?
Drifting
Joined: Oct 1999
Posts: 1,722
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From: Gloucester Va
Re: (Corvette0096)
Yeah I wish I could remember the curve on this guys vette. It wasn't bad but not sure if it was worse. Also keep in mind it was a LT4 which make power up high compared to L-98's anyway.
Melting Slicks
Joined: Sep 2000
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From: PITTSBURGH PA
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Re: (88_vette)
the 383 is closer to a 406 than the 350 just by use of the same stroke now in a drag motor the extra torque from the stroke is what is going to get you down the strip better the 383 is like the 406s little brother very close in torque and about only down about 25hp to its bigger brother :D :cheers:
Melting Slicks
Joined: Jan 2002
Posts: 3,159
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Re: (CORKVETTE1)
i dare claim this question to be invalid.
you stock a 350 top end a 383 (like many do) and you bound to find problems and vice versa. Aside from budget (want to use stock crank) and displacement limitations placed upon a class, i have to hear a valid argument against stroking an engine. I have asked many and found it tried and true. those who know, stroke. others tend to make silly generalizations such as "383s are torque monsters, they dont rev high" or "well by best friends bother in laws step sons girlfriends father ran 9's in a 355 and his friend ran 12s with his 383 so there"
you stock a 350 top end a 383 (like many do) and you bound to find problems and vice versa. Aside from budget (want to use stock crank) and displacement limitations placed upon a class, i have to hear a valid argument against stroking an engine. I have asked many and found it tried and true. those who know, stroke. others tend to make silly generalizations such as "383s are torque monsters, they dont rev high" or "well by best friends bother in laws step sons girlfriends father ran 9's in a 355 and his friend ran 12s with his 383 so there"