Big Block Exhaust Manifolds

Nope, only if the driver side is a rear dump, but they are low flowing beefy units. Try and get 69 Hi-po logs or similar with the #7 port going looping behind the stud. With a 5 degree mill on the mating surface on the driver side to tuck it closer to the block, they fit better. Pass side is a bolt in on a B motor without the heat riser, RB might be a different story. Hi-po's need the steering tube to be cut almost at the firewall.