This is nuts. I purchased this vehicle a 2 years ago and has a clean carfax report. I know carfax isn't bullet proof, but who dives into the engine bay looking to match VIN's on a car with 11k miles? I certainly didn't. I would totally go after the dealer but I already voided my warranty because I notched the frame to make it sit right. So it is what it is.
So today, I went to upgrade my cam and gears. That's when I found out about the varying vins. It's kind of wild, after taking the engine apart, it's pristine, inside and out. Almost as though the dealer replaced it with a new one for some reason.
Anyway, I upgraded everything from there and had it rebuilt to withstand the upcoming extra horses from the cam and mainly the supercharger.
This is becoming super expensive, but I looked at crate engines and the problem I have is with GM factory engines, the max you could get is 770 hp at a cost of $24000. I'll be spending half of that and with the supercharger, I should exceed the 770 hp mark (Although I originally wanted to stop at 600). Either way, I am going to Dyno the truck after the cam tomorrow to see if the 75-100HP claims are accurate, and then I will be adding the supercharger and dyno again.
Now on to the questions for the experts and enthusiasts...
- Throttle body spacer - yes or no?
- Since pan is out, should I replace the oil pump? Car has 40k miles on it now.
- Save money and go with Shorty headers or spend more and get long tubes? Noticeable difference?
- Was told that GM gears should NOT be replaced if adding supercharger to avoid aggressive jerking shifts. True?