Would like to rant a little!
I use them on everything I build, like some of you guys i'm an old racer, so what the hell use what ya got laying around.
now for the rant! I bought a set of pro comp 210's that is based on a .200 raised runner chevy head, bought the bare castings, ported them to a 1266 gasket, manley valves, comp springs and retainer & locks, guy shows up at the shop and throws off on my chinese heads! Now mind you I have a Howards Crank, Callies H beam rods, with a Lunati roller cam in the bottom end. in the next gasp of air told me I should have used Eagle or Scat in the bottom! I wanted to Smack the crap outta him! I did ask him to leave pronto!
And 26Troadster I haven't even saw a Isky rev kit since 1980 but do remember them!