Thank you for this, I have been searching and searching info about lifters and what I can use since the LS7 lifters are on national backorder. I don't mind spending a little more on lifters, are these good ones?
They are stock replacements and not recommended it seems for performance camshafts.
The 12499225 are the ones you want, that or a Morel or Johnson. They are not a stock replacement and are designed for performance cams. I've been running them on a 231/246 .640 lift cam without any issues. Along with many, many other people running all sorts of LS combinations. And I'll probably actually buy some just to have since they're back in stock lol
Just for peace of mind even though you aren't milling the heads or going aftermarket (as far as I know), I'm sure you'll at least be replacing the head gaskets, hopefully hahah. So whether it's an oem replacement gasket or something thinner or thicker, grab a push rod length checker and see if your stock rods will work. Those GMPP lifters like .060"-.080" preload to be happy.
Keep up the work!! Reminds me I need to take care of some paint work on mine like the mirror caps.