15-03-2024, 08:17 PM
I've had several blocks with this problem and talked to other owners with the same problem. For standard spec road engine you can just avoid tightening that stud as tight as the rest and add some sealant around it when you refit the head. If you aren't getting coolant in the cylinders themselves (look for combustion chambers that appear 'steam-cleaned') then i wouldn't worry too much.
On blocks i have raced with the same crack, i've drilled down into the base casting of the water jacket, drilled a slightly oversize matching hole up from the underside of the block, then tapped a 5/16 thread in the base of the water jacket to take a much longer stud. I can draw a diagram of this modification if that is helpful.
On blocks i have raced with the same crack, i've drilled down into the base casting of the water jacket, drilled a slightly oversize matching hole up from the underside of the block, then tapped a 5/16 thread in the base of the water jacket to take a much longer stud. I can draw a diagram of this modification if that is helpful.