I‘ve got an exhaust leak along the bottom of the header that I can’t seal up. Before reinstalling the motor, I should have pulled the heads and done DanRs modifications plugging the emission ports along the bottom of the head and drilling for the additional header bolts but I was overly optimistic that it wasn’t an issue before I pulled the motor, so everything should be fine putting it back together. Anyway, I‘ve pulled the heads and will be heading to my machine shop tomorrow to have the work done.
While the heads are off, I want to drill the additional cooling passages that I keep reading about, but I keep coming across different info. Some recommend just two additional holes. Some say drill all four. Seems like more holes = more cooling. Is there any reason NOT to drill all four holes in each head?
While the heads are off, I want to drill the additional cooling passages that I keep reading about, but I keep coming across different info. Some recommend just two additional holes. Some say drill all four. Seems like more holes = more cooling. Is there any reason NOT to drill all four holes in each head?