proper helicoil size for thermostat studs

[CHIF8008]

hey guys, putting my motor back together and found that the threads inside my head for the thermostat studs are stripped.

i was told that the studs are 8x70? i dont know exactly what that means and im looking to helicoil the damaged threads. any idea what size helicoil i need and where i could pick a kit up locally?

thanks in advance, this stupid thing is holding the whole project up.

[CHIF8008]

the thermostat studs are the same size as the intake, and exhaust studs. so if you have had either of these fixed you should know the size i need.

[whodwho]

Should be 8 x 1.25