I have a big block with the same issues. And I'm not even running large primary tubes. I'm running Hooker Comp headers, and they snake around the starter. Takes me all day to change my starter. I have to pull the dipstick tube, the tranny cooler lines, the plugs and wires on that side, and remove the header. Then I have to remove the heat wrap, so I can SEE the starter. Last starter I put in it lasted 6 months. I'm going to buy a better starter next time, and put more Thermo-Tec wrap on the tubes. It has some on there now, but it could use more. BB race motors eat starters.