Originally Posted by
Nightshade
I need to check my paperwork but I am thinking I am .30 over...I forget.
I have run the engine and no heating issues at all using a stock FJ40 radiator at low speeds.
Anyways just thought I would try, always wanted to play around with a B18
.30 over is the most common overbore. i would imagine thats what you have. had a kid do a .60 over block for his mud truck ... thing overheated all the time. just like my dad told him it would.