The only reason I can think of for the teams asking for this is so they can possibly go for more MFG moneys since Chevy's marketing "pot" split 16 ways probably isn't enough to buy spark plugs for a season.

But what MFG is going to offer up sponsorship $$ in PRO STOCK when everything is a GM motor.... Top fuel and Funny Car all run mopar motors and there's not really enough $$$ in it for GM or Ford to justify spending $$$ for a brand specific block and heads...is there? Maybe when Force did the re-badged ford Hemi is somehow talked them into that? but not for pro-stock.