Cadillac Northstar M11x1.5 Last Chance Head Bolt Repair

www.wiseautoto... How do you repair a headbolt hole's threads when a Big Sert repair fails? Answer: If it's a Northstar engine with M11x1.5 threads the 1615NSF just may do the repair. It installs threads in the upper portion of the hole and a different head bolt is used. It's been known to to save the block!