This is a proven solution without condemning the engine block. (THIS IS NOT A REPAIR KIT)TRY IT!
eBay
KIT CONTAINS: Drill, Counterbore, Tap, Installation Driver. Then screw the insert onto the prepared hole.
eBay
With easy-to-follow instructions and all necessary tools included, Big-Sert kits make even the toughest thread repairs straightforward and effective.520" Oversized inserts x 5. Kit Contents Trusted by professionals worldwide, Big-Sert Repair Kits are renowned for their superior quality and performance.
eBay
(5) M10 x 1.25 x 9mm Carbon Steel Inserts. KIT CONTAINS.
eBay
eBay
QUANTITY - 16 x INSERTS. Its thin cross-sectional area allows for installation in areas of limited space and clearance material. On installation the bottom internal threads of the insert are cold rolled to expand the mating external threads into the base material, thus locking the insert in place.
eBay
Insert lengths included in qty. of 10:(M5x0.8x7.6mm / M5x0.8x10mm) (M6x1.0x9.4mm / M6x1.0x12mm) (M8x1.25x11.7mm / M8x1.25x16.2mm) (M10x1.25x16.2mm / M10x1.25x20mm) (M12x1.5x15mm / M12x1.5x19mm). Each set includes 5 complete tool kits with 20 inserts per kit "10 each of short and long" for a total of 100 inserts.
eBay
5 x M10 × 1.25 x 14mm - Oversized Inserts | OD 13.7 mm × Outside Pitch 1.5 mm. With easy-to-follow instructions and all necessary tools included, Big-Sert kits make even the toughest thread repairs straightforward and effective.
eBay