Heat riser bushing size?
Just to update if someone ever looks this up in the distant future. On my stock unmodified 63 exhaust manifold the bushing size is 5/16ths I.D X 3/8 O.D fit great just put a little silicone on the outside to hopefully keep it in.
Just to update if someone ever looks this up in the distant future. On my stock unmodified 63 exhaust manifold the bushing size is 5/16ths I.D X 3/8 O.D fit great just put a little silicone on the outside to hopefully keep it in.
