Mine was held in place with a 10mm coarse thread and they kept working loose even with locktite. So I've rethreaded the chassis holes with 7/16-20 fine thread. Then found the ARP 743-1750 bolts. The bolts have to be cut down but they give you that nice shoulder to fit snug in the 11mm holes in the motor. I fit each bolt individually with a 7/16 adjustable hand reamer taking out as little as possible for each bolt. Not a fun process since the motor goes in and out many times but it's still holding solid after 3 tanks.
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