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Originally Posted by Kevin
The NCRS is not the be all end all of vette knowledge. I can garuntee that there are people on this site that know more about the ZR-1 than what is in the manuals. There are many things that need to be changed out to help the car run better than the way it left the factory. Besides pumping money into the ZR-1, GM did very little to help the ZR-1. Hell you can make a 570 rwhp ZR-1 look stock save the powder coating of the plenum/cam covers. There was so many of these cars that were/may have/ could possibly have been worked over at the factory that no one actually knows what is from the factory and what isn't.
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I agree with that. I have torn down numerous LT5's and have noticed date stamping on these cars is not the norm. As most of the parts were made in a one time batch and then made no more. Pretty cool to see a 92 LT5 with a date stamp from 89' on the injector housing. JIT production really throws a monkey wrench into things. How is the NCRS going to account for somebody who has added Dunn heads to a 95 model that didn't have them originally. What's the paperwork that is going back the judge up on that one?
I can also throw done a few different injector housings that are brand new and do not have any paint match.
Kevin does bring up a good point on porting. If NCRS wants bone stock true to the delivery floor representations, you're not going to get that. Some of the later cars recieved special touches.