Its a stock shortblock minus cam and timing chain.

Guys lets keep it on topic thanks!!!

I dont live in Cali anymore Im in south dakota just havent updated it in awhile.

 

Most of the cars in GM hightech performance pass emissions for NJ. I think that is the reason many of them are not on the "big dog" list. Their track requires cars to have mufflers on them!
That a long with many owners having a preference for a more streetable car keeps the power down. There are plenty of 600+rwhp 383s rolling around you just got to know where to look.

This one isn't a 383 but you get the idea.
612rwhp NA

 

Looks like an LS1 to me. Wasn't the thread about LT1s?

 

Yea, I was looking for a link to the Harden Performance LT1, or Joe Overton's (although I don't think Joe has any dyno numbers of his car) but couldn't find one. The Harden car is making more than that LS1, and I bet Joe's is making very close to the same power.

 

Wow, maybe I'm just old school but isn't 12:1 awfully scary with nitrous?? Maybe if you are running all top shelf nitrous parts with a very qualified engine builder well versed in nitrous engines you could get away with a small shot......but all of the guys I know running serious N20 are all in the 9.x:1 range. I am new to this fuel injected thing so if I am wrong here please school me.

 

N2o loves compression. 12:1 with a N2O set up is mild in many peoples books. Assuming the short block is build to handle the power (forged, 4-bolt, etc.) you can throw a whole lot of N2O at a 12:1 motor.

 

Hmmm. I thought that N20, like boost, prefer lower compression due to the increased cylinder pressures.

 

Nitrous has a cooling effect that boost does not have, pro mod motors run 15 or more to 1 and spray god knows how much to those engines.

David

 

Like mentioned, N2O will cool the intake charge considerably which will reduce the chance of detonation. The main reason that N2O likes compression is that it requires a high specific amount of heat to seperate the Oxygen from the Nitrogen. The high compression helps that process. Also, N2O does not add air molecules to the cylinder on the intake stroke like boost does. Therefore, you do not need a lower static compression to obtain acceptable dynamic compression. The Oxygen from N2O is released on compression/ignition.

 

Hey now...I have a 383 LT1 and it isn't a 'turd'....if it wasn't for me trying to skimp by with a RaceTronix fuel kit I'd have a full dyno graph for ya...but at 4300rpm it made 567/580 rwhp/rwtq....not bad considering she's going to 7k and it wasn't tuned worth crap since I was running out of injector and fuel pump we just called it quits for the day. Those numbers were also on a Mustang Dyno...not a DynoJett. I'm guessing right now it should be well over 650 rear wheel by the time its all said and done....be nice to hit 700 though

I'll have full numbers for ya hopefully this summer when I get time to finish it.

There are a few 383/396 cars that put down quite a bit of power...you just don't see them post on the net all the time about them.

 

I'm curious. That's the MOST power I've heard of coming off of a NA 383 LT1. That's incredible. Care to share some specs on your combination??

 

I dont have any dyno #s but I was dissapointed when I first put my 383 together, from my trap speed we guessed the car was only making 360 something at the rear wheels. After long thought I changed the cam from the 224/230 XE to the 230/236 XE. and the thing woke up big time. My next step is to have my AFRS ported. All the guys that drive the car think it is screaming for more air. I settled on 10.8 to 1 compression finally and it runs fine on pump gas. The smaller cam made more low torque but I seen very little low loss and a but load of linear power increase with the bigger cam. This winter as I said I amd pulling the heads off and having them done to flow alot more. I beleive I am going to try the GM 847 cam as well , just to see if it moves up with it as well. Still though on the smaller cam with poor traction in second gear (it was weird , it would hook good then break loose) it ran 12.50s with no sorting done full weight(3750 with me).

 

1le, is that n/a? doesnt sound like that is right unless you have some pretty extreme 15 or 18* heads on there. Im guessing either FI or N2O???

 

Blower or N20, no way thats normally aspirated

 

What gets me is that 2 of my friends have stock bottom ended LT1's and they are pushing 430+ and 452rwhp.
another friend has a built 385 with custom fuel system and is pushing 420rwhp.
The 385 has more torque than the 350's but it's amazing what proper heads & cam selection, and tuning can do.