What type of Headers are you using on your sbc I know you can run the Huggers Type but I have seen a set on a 50 Merc that were Regular type and I can't remember if the Guy said they were 76 Chevy 4x4 PU Headers or 79 Any idea's, Dom.
my dad's are cast iron exhaust manifolds... His exhaust pipes would probably scrape the ground if he ran headers...his merc is low.