Quote: I'll guess I'll find out soon, I'm also running J12's. Don't know if it matters but the 2 1/4 pipes are like drinking a thick shake thru a soda straw. I'd unhook the vacuum advance, bump the jets up 2 and back the timing to 35* at 2400 and see if that helps.
But you have good quench , he doesn't. You might want to find a set of equivalent heat range to JY10's ?
