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is it possible to build a 383 out of a 305

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Old Mar 11, 2005 | 06:15 AM
  #1  
uwilluz1's Avatar
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From: northern oakland county mi
Car: 84,89,00,02 t/as 71vette sierra
Engine: 310,350,383,383
Transmission: bw t5, trem t5, hurst 6 spd
Axle/Gears: 4.10, 3.42, 3.73, 3.73
is it possible to build a 383 out of a 305

just wondering
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Old Mar 11, 2005 | 06:35 AM
  #2  
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From: Columbus, In
Car: 87 Camaro
Engine: 406
Transmission: T56
Axle/Gears: 9" ford 35 spline axles
NO....Not enough material in the block to bore engine to 4.030. You can still put a 400 crank in a 305, but might as well get a 350 block and build 350 or 383.....As the old saying goes....There no substitution for cubic inches....
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Old Mar 11, 2005 | 07:01 AM
  #3  
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From: northern oakland county mi
Car: 84,89,00,02 t/as 71vette sierra
Engine: 310,350,383,383
Transmission: bw t5, trem t5, hurst 6 spd
Axle/Gears: 4.10, 3.42, 3.73, 3.73
ok, i guess my main concern is the motor mounts. i have seen the specials and articles about dropping an ls1 into a third gen. and between all of the hacking and fabricating, im trying to do something simple with my existing block. do you think a 350 would work with my 5spd without much modifications. i dont think these cars came with 350 5spd
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Old Mar 11, 2005 | 07:10 AM
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From: Columbus, In
Car: 87 Camaro
Engine: 406
Transmission: T56
Axle/Gears: 9" ford 35 spline axles
T-5 5spds have a reputation for being weak.... I personally have seen them take alot of abuse as long as slicks arent being used...It would last for a while, especially if 350 is pretty stock....I had a buddy that had a stock t-5 behind a well buit 350 (came out of his stock car) He is the only person i ever had tell me I wasnt driving his car hard enough...lol He never broke the transmission.....
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Old Mar 22, 2005 | 12:21 AM
  #5  
jbqualls's Avatar
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From: Virginia
Car: 2001 Z28 camaro
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
I have a 305 with a 400 crank. Bored 30 that makes 335 cubic inches. It's an awesome engine and I can easily outrun my stock 98 LS1 Z28. It has a crapload of torque and has a lot of power throughout the powerband. I have my stock T5 with a hurst short shifter to help with shifts.
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Old Mar 22, 2005 | 05:31 AM
  #6  
uwilluz1's Avatar
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From: northern oakland county mi
Car: 84,89,00,02 t/as 71vette sierra
Engine: 310,350,383,383
Transmission: bw t5, trem t5, hurst 6 spd
Axle/Gears: 4.10, 3.42, 3.73, 3.73
Originally posted by jbqualls
I have a 305 with a 400 crank. Bored 30 that makes 335 cubic inches. It's an awesome engine and I can easily outrun my stock 98 LS1 Z28. It has a crapload of torque and has a lot of power throughout the powerband. I have my stock T5 with a hurst short shifter to help with shifts.
man dont let the guys at ls1.com hear that. they will throw a hissyfit!!!!!! but thats what im looking for, some respectable horsepower. with my stock block. thanks
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Old Mar 22, 2005 | 11:26 AM
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Originally posted by uwilluz1
man dont let the guys at ls1.com hear that. they will throw a hissyfit!!!!!! but thats what im looking for, some respectable horsepower. with my stock block. thanks
Or you could build a 383 for the same price and actually outrun LS1's.
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Old Mar 22, 2005 | 12:19 PM
  #8  
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From: Virginia
Car: 2001 Z28 camaro
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
I am eventually going to get a 350 block and put the same crank in it, however, the 335 turned out way better than I thought it was going to. I mainly did it just to see what would happen.
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Old Mar 22, 2005 | 03:59 PM
  #9  
uwilluz1's Avatar
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From: northern oakland county mi
Car: 84,89,00,02 t/as 71vette sierra
Engine: 310,350,383,383
Transmission: bw t5, trem t5, hurst 6 spd
Axle/Gears: 4.10, 3.42, 3.73, 3.73
well thats what i have in my two ls1's. lingenfelter 383's, but to do that i would have to by a 350 block for my 89 right, and then make it a 383?
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Old Mar 22, 2005 | 04:03 PM
  #10  
jbqualls's Avatar
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From: Virginia
Car: 2001 Z28 camaro
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
that is correct...in order to have a 383 you would have to buy a 350 block
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Old Mar 22, 2005 | 04:07 PM
  #11  
uwilluz1's Avatar
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From: northern oakland county mi
Car: 84,89,00,02 t/as 71vette sierra
Engine: 310,350,383,383
Transmission: bw t5, trem t5, hurst 6 spd
Axle/Gears: 4.10, 3.42, 3.73, 3.73
and that block would bolt right up in the existing location as my 305, and the 5 speed also?
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Old Mar 22, 2005 | 04:12 PM
  #12  
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From: Virginia
Car: 2001 Z28 camaro
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
Yes...the block will go in like it is the 305...they have the same exterior dimensions
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Old Mar 22, 2005 | 04:17 PM
  #13  
uwilluz1's Avatar
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From: northern oakland county mi
Car: 84,89,00,02 t/as 71vette sierra
Engine: 310,350,383,383
Transmission: bw t5, trem t5, hurst 6 spd
Axle/Gears: 4.10, 3.42, 3.73, 3.73
now i just have to find a 350 tpi block.
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Old Mar 22, 2005 | 04:45 PM
  #14  
anondude13's Avatar
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Originally posted by uwilluz1
now i just have to find a 350 tpi block.
Doesn't have to be tpi... It can be a gen 1 350 from any 87 or later car, truck, van, whatever you can find, and you will find one if you go to a junkyard.
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Old Mar 23, 2005 | 12:38 AM
  #15  
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From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
hey jb ,how much did the stroker kit cost you.i`m thinking about doing the same thing.what kind of tuning did you have to do?
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Old Mar 23, 2005 | 07:34 PM
  #16  
jbqualls's Avatar
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From: Virginia
Car: 2001 Z28 camaro
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
It wasnt that bad. I bought it from powerhouse, enginekits.com, and I ended up paying $1200, but that was for the stroker kit and everything for a rebuild, including a new cam.
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Old Apr 4, 2005 | 09:21 AM
  #17  
90tagta's Avatar
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From: Kansas
Car: 1990 Trans Am GTA
Engine: 305 TPI
Transmission: 5-Speed
I went and looked at that site for the 335 kit. Will the chevy small block kit work the same in my GTA or am I outa luck?
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Old Apr 4, 2005 | 09:44 PM
  #18  
jbqualls's Avatar
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Joined: Oct 2004
Posts: 61
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From: Virginia
Car: 2001 Z28 camaro
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
Yeah that should definately work in your engine also. I would call and talk to them.
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