[jimbob trucking on 2]

I'm am in the process of dropping a 383 stoker
engine in my 1993 GMC truck.I wanted to stay with
the fuel injection system,plus computor system and
all the little goodies,such as remote start etc.
But I've been told I would have less problems if I
went to a carburator system.Can anyone give me some
advise?

[RHamm1320]

Your computer will compensate for the increased cubic inches by itself. We have put 350's in place of 305's and 383's in place of 350's many many times and never had a problem.

If your fuel injection works ok now - it will work fine after the change.

Thanks,

Ron


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[madingo]

Absolutely not ! The injector size AND engine size have to be programmed correctly for the system to work on any fuel injected vehicles. There is no such thing as compensation for these things-the only exception to this is mass air flow vehicles, and the injector size is still necessary, if changed from stock. What needs to be know is that the tbi systems will not tolerate any sort of rough idle, and that if you intend on continuing to use the 4L60E transmission, which is wholly electronically controlled, then the factory system is necessary. Please discontinue spreading misinformation to other people, based on a lack of any information and knowledge on your part !!

[RHamm1320]

I am not interested in getting into a flame war, but all I can say is I have done it many times and never had problems. Maybe if you are looking for the extra .2 miles per gallon or 1/10th second et, then maybe... it is worth all the extra changes.

[ January 25, 2002: Message edited by: RHamm1320 ]</p>

[madingo]

You got half lucky on yours. Likely, your engine vacuum is just enough globally lower for your 383 to run smoothly, but 10 years of programming factory efi systems successfully will beat out dumb luck anyday. My only issue with you is that you should not spread misinformation, based on dumb luck, at best. Tell me what you know about comouter programming on efi vehicles.

[xtreme off-road]

I built a chevy 383 and ran into a couple of problems, here are my fixes.
The first thing to do is raise the fuel pressure going to the TBI. I modified my factory regulator to make it adjustable and put a 30 psi gauge. I run 14.5 psi. Yours may be different, depending on your cam. If you use the factory timing setting of 0 degrees advance you won't make peak power. After lots of experimenting i found the best way is to keep advancing till you hear it knock then pull it back. Pay close attention cause the knock sensor will try to adjust pull back your timing, listen carefully.
I used a compucam 2030 and am very happy with it for my application. It pushes my 8600 lbs 4X4 around like it's a toy. Gobs of torque with respectable HP.
I have been beating on this engine for 5 years and have learn a lot about making them run on the factory TBI computer. Mine makes 450 lb/ft and 400 HP. And i still have to put in my JET chip.
If you want to know more just PM me. The list is to big to post.

Good luck