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No advice to OP, but just a general question since topic is 7.4:
Does anybody have any experience with the L21? It sounds pretty cool with forged internals and coil-on-plug ignition. Never seen one in person. Looks like only the Kodiak/Topkick had them? Not sure what HP/TQ those made. An why did they make less power than L29? Seems it would make more? Maybe it was vehicle-specific factory tune?
Yes, the L21 was used in the medium-duty trucks, but was also optional in 3/4 Suburbans and the 2500/3500 vans.
A bit less HP/Torque, but set-up for long term heavy-duty use.
Those engines were also used as marine engines.
A great engine for a rig that does a lot of towing.
The L21 was medium duty only. The l29 was in the Suburban and van.
Did you get that from Wikipedia?
https://en.m.wikipedia.org/wiki/Chevrolet_big-block_engine
Maybe Wikipedia is wrong! No wonder my kid's teachers don't allow Wikipedia to be listed as works cited, LOL.
Don't know how I managed to de-rail this thread again!
Anyhow, I admit I don't know much about these trucks, so don't listen to what I have to say