I bought a 07 LY6 to drop in a 89 iroc for a project. The motor came with the stock plugs in it and also with a set of stock plugs out of a 2011 LS3. I plan on running the LS3 plugs in the LY6 and want to know if I can run the stock LY6 6.0 plugs in my 99 5.3 cause im inn need of plugs and the 6.0 plugs are like new.

 

They are all the same threads.. so yes

why the changing? just run the LS3 plugsin the 5.3.... whats the PN on them?

 

Ls3 plugs 12609877
Ly6 plugs 12571164

 

Did those part #s not tell u anything?