Originally Posted by ProbablyInsane

Thanks for the advice! I have come to learn that appriently used LT4 parts are not easy to find, and any new replacement parts are appariently made of rediculouslyexpensivetonium. The only reason I would have put a cam in off the bat is because the engine would be out and on a stand, which I imagine would make the came swap a heluva lot easier. But, with everyone saying the stock LT1 does well with the LT4 RR's and springs, then I guess I'll go that route! Btw, I also noticed in an article that the LT4 overlap allowed for the elimination of the EGR valve. For my application, with stock LT1 cam or not, the EGR and AIR would be removed and the PCM tuned to eliminate those needs. But, will the elimination of these two things cause a drop in MPG? IIRC, all these two things do are lower NOx levels in the exhaust? If it's any help, since the 350 Im using has a 10.4 compression, I would always use premium fuel.