1997 k1500 ext cab

[Dakota Hill]

Hey guys looking for some input so lastyear I built a 5.7 350 for my 97 used icon forged flattop pistons, stock connecting rods, stock crank, a cam from comp woth .488 .495 lift cam and shorty headers, and had it tuned by black bear and for some odd reason it just dont run right. Like itll make all the noise you want it too but if your beating on it, it goes absolutely nowhere fast and im to the point of 0411 swapping it if I can't get it figured out anyone got any input or things to try??

 

[letitsnow]

Do you have any way to watch fuel trims and timing while you drive it?

 

[L31MaxExpress]

Hey guys looking for some input so lastyear I built a 5.7 350 for my 97 used icon forged flattop pistons, stock connecting rods, stock crank, a cam from comp woth .488 .495 lift cam and shorty headers, and had it tuned by black bear and for some odd reason it just dont run right. Like itll make all the noise you want it too but if your beating on it, it goes absolutely nowhere fast and im to the point of 0411 swapping it if I can't get it figured out anyone got any input or things to try??

Really not shocking to me being BB tuned. I have retuned several of them myself. Most need some timing.

 

[Dakota Hill]

Do you have any way to watch fuel trims and timing while you drive it?

Have a scanner hooked up and looks normal to me but then again I don't know what they should be to begin with prolly my fault, but im learning

 

[Dakota Hill]

Really not shocking to me being BB tuned. I have retuned several of them myself. Most need some timing.

Actually I need timing taken out it sits at idle 35 degrees advanced sitting at 750 ish for an idle

 

[Schurkey]

What are the cranking compression pressures in all eight? What is your altitude?

Was the cam degree'd when installed, or just shoved-in "dot-to-dot"?

Do you have prior experience setting lifter preload?

Does the throttle open all the way? How do you know?

Do you have a high-lift cam pushing valves in the stock, crappy swirl-port heads that have NO CHANCE of flowing large amounts of air? A higher-rpm camshaft in an engine that CANNOT make power at high rpm is going to be a dog everywhere in the RPM band.

What did "Black Bear" remove from the programming? EGR functional? Other codes "disabled"?

 

[letitsnow]

What do you consider fast?

 

[letitsnow]

I hooked my scanner up. My BB tuned 350 at 800 rpm idle, the timing is 18 degrees.

 

[Dakota Hill]

Yeah its all sorts of everything right now havent done a compression test on it, put it in dot to dot, yes stock 062 heads with upgraded springs all that I did to em, turn push rod back and forth and tighten rocker till their is resistance and tighten one full turn, how I was taught hasnt failed me on my stock engine, idk what black bear did I dont have software to read the tune.

 

[Dakota Hill]

Okay so what sparked this was its stock bottom end with flattops and it's studded with stock 062 heads with upgraded springs for the lift I was using, I upgraded the fuel injection system while I was at it and had black bear do the tune because we'll im not that experienced with it yet learning curve, ohh and added shorty headers, this thing should have alil power for what I did, and I got beat by a F-150 5.4L in it and it had a 55 gallon drum of boat fuel in the bed of the truck, and I got walked like wtf is wrong with this engine, it's honestly prolly no better than stock.