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Re: 454 identification
My suburban had 271,000 on it when I got rid of it. I still
Made long trips in it frequently. My father in law has my old K3500, 230,000+ on it now with no issues. He drives it 150+ miles a day to work and back.
The L29 in my 98 K2500 still runs great at 207,000. None of them run very well at 4500 plus, they run out of air very quick. As said above The L29 and L21 both have really small cams that are degreed retarded from the factory for emissions reasons. A cam swap and proper cam timing wakes them up quite well, as does good injectors. (the Oe injectors are junk)
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