LT1-LT4 Modifications 1993-97 Gen II Small Block V8

383 guys come in here

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Old May 4, 2009 | 12:38 AM
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Default 383 guys come in here

just wondering what you guys run since my 13.1 is going to be done next week. Im have some LE2 H/I and going to have LE make a cam for me
Just put down a little info on set up and time thats all i ask
thanks
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Old May 4, 2009 | 10:04 AM
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Originally Posted by aug181983
just wondering what you guys run since my 13.1 is going to be done next week. Im have some LE2 H/I and going to have LE make a cam for me
Just put down a little info on set up and time thats all i ask
thanks
So why did you decide on 13.1?
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Old May 4, 2009 | 10:17 AM
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Yeah I hope you plan on running Jet Fuel. IMO that compression is a little on the high side.
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Old May 4, 2009 | 11:30 AM
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People for some reason think that you can't run compression that high with pump gas in an LT1 but guess what? There are lots of cars doing it. With a big cam you can get away with real high compression. So no jet fuel. Regular ol 93 will be good as long as you have the cam do back it up.
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Old May 4, 2009 | 11:39 AM
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I myself realize that, I'm just curious as to what he's planning to do with it.
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Old May 4, 2009 | 12:23 PM
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Originally Posted by GoFastKid
Yeah I hope you plan on running Jet Fuel. IMO that compression is a little on the high side.
Jet fuel will run great in a diesel, but not in a gas engine. It’s pretty much kerosene.
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Old May 4, 2009 | 01:29 PM
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Times/mph in my sig...Weenie cam, 11.2:1, LT1 LPE/E.B. Porting heads, Vig 3600 (now 4000), Strange 12 bolt w/ 4.10s, 275 60 R15 M/T ET Drag Radials, whole lotta of attention to detail...3600plus raceweight and driven everywhere...don't own a trailer...Shooting for a 10.99 this year...

--Alan
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Old May 4, 2009 | 01:49 PM
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Originally Posted by aug181983
just wondering what you guys run since my 13.1 is going to be done next week. Im have some LE2 H/I and going to have LE make a cam for me
Just put down a little info on set up and time thats all i ask
thanks
Calculate your DCR, that will determine your octane requirements.
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Old May 4, 2009 | 02:04 PM
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I was debating what they ment by 13.1 because I have never called a motor by its compression ratio for a name lol. 13.1:1 is high, but it is possible and quite a few people do it on the LT1 on 93.
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Old May 4, 2009 | 03:34 PM
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12.3 on my 383. DCR is at 9.1 with a 292XFI cam. Pump gas friendly on the street and the track. Lots more test and tune to be done. Best time is in my sig.


Originally Posted by ABA383
...Shooting for a 10.99 this year...

--Alan
Knock it out of the park Alan!

Mec
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Old May 4, 2009 | 03:41 PM
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Originally Posted by Greaseymec
12.3 on my 383. DCR is at 9.1 with a 292XFI cam. Pump gas friendly on the street and the track. Lots more test and tune to be done. Best time is in my sig.




Knock it out of the park Alan!

Mec
Thanks! I do have a "ringer" this year...Future Mrs. ABA383 is 115 lbs...I'm 220...She's a tenth just sitting in the driver's seat....Now if I can just convince her to make a pass........in the car (you perverts)

--Alan
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Old May 4, 2009 | 03:53 PM
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Originally Posted by ABA383
Thanks! I do have a "ringer" this year...Future Mrs. ABA383 is 115 lbs...I'm 220...She's a tenth just sitting in the driver's seat....Now if I can just convince her to make a pass........in the car (you perverts)

--Alan
hahahahaha thats great
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Old May 5, 2009 | 12:31 AM
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Mine is 13.7:1 and I run 110 unleaded(track only car)
one word of advice if you dont have a ignition box that you can retard the timing at start up you will be going through starters real fast
I have a digital 7 box and retard the timing 20 degrees on startup
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Old May 5, 2009 | 04:36 AM
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Originally Posted by Dave J
Mine is 13.7:1 and I run 110 unleaded(track only car)
one word of advice if you dont have a ignition box that you can retard the timing at start up you will be going through starters real fast
I have a digital 7 box and retard the timing 20 degrees on startup
Interesting, I never had any idea retarding timing would make it easier to start, I will need to go research why not darn it lol. My starter sounds like it gonna kick the bucket every time I roll mine over and its no where near 13.7:1
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Old May 5, 2009 | 08:36 AM
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I run 12.5 to 1, better have your poop in a group to run that static on pumpfuel, people dont realize that pumpgas is not always the same at every pump.

I get fuel from a very busy Shell station, the fuel stays fresh(er).
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Old May 5, 2009 | 08:43 AM
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13.1:1

Big overlap cam, timing pulled, higher octane fuel ... pick your poison (or some combination thereof).
Keep us posted on how it works out and make sure your tuner knows what he's doing.

Make sure Lloyd knows what SCR you are running so you get a cam that will work.


To the original question;
Asking what 383s run is like asking what 350s run. Displacement is a minor factor in the whole equation.
Component selection and overall attention to detail in selecting a combination will ultimately determine what
you can and cannot do and thus what you can run.
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Old May 5, 2009 | 09:30 AM
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My motor was a 9.8 :1 GM 847 AFR heads stock intake, 3000 stall, 3.73 gears in the stock rear and it ran 11.50s in the heat and 11.3s in the cold.

I use 87 Octane.
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Old May 5, 2009 | 11:26 AM
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Originally Posted by James Montigny
13.1:1

Big overlap cam, timing pulled, higher octane fuel ... pick your poison (or some combination thereof).
Keep us posted on how it works out and make sure your tuner knows what he's doing.

Make sure Lloyd knows what SCR you are running so you get a cam that will work.


To the original question;
Asking what 383s run is like asking what 350s run. Displacement is a minor factor in the whole equation.
Component selection and overall attention to detail in selecting a combination will ultimately determine what
you can and cannot do and thus what you can run.

Timing doesnt necessarily have to be pulled, I run 36 total. But the quench has to be TIGHT and dead on. Among other factors.

Yes a cam with more overlap is required, but mine isnt bad, pretty docile as solid rollers go.
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