I have a spare Northstar with a spun rod bearing. Took it apart today to check it out. Undid head bolts by hand to get a feel for the threads. The heads on this motor are much cleaner externally than the block, which led me to believe it had probably been timeserted. How can I tell for sure? Looked in the bolt holes, I think I see an insert, but my eyes aren't what they once where. The motor in my 98 STS is starting to push anti-freeze out and I did a leak-down test and found the coolant level rose when I pressurized #3 cyl. I'm hoping to combine the 2 motors, just want to see what I'm into before diving into it.
Thanks for any help,