someotherguy
I'm Awesome
You mean a 3500HD. No 'C' as there were no factory 'K' models. Sorry; couldn't resist..8.1 came out in 01. You could get a GMT400 based C3500HD with an 8.1 in 2001 and 2002. The L21 was also a 454 with coil packs and drive by wire.
Oh and the L21's were in medium duty trucks.
Richard