The name says GM rocker arm holes but my Silverado 6.0L's rocker arm hole threads are about 18-20mm deep and they only send 11.8mm inserts in this kit. hope it lasts I chose them because they should be better than HeliCoils but I hope the short deployment length will hold up. I was able to get decent length HeliCoil inserts so I hope I didn't spend 4x the money on a half length alternative. Fingers crossed.
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