had a keensert in my wifes audi engine for 4 years, worked great. thermal expansion is no different between the head and keensert, and the head and a sparkplug, and should not be an issue. helicoils should not be used in a cylinder head, as they are a temporary repair, and do not provide a seal. they work in a pinch, but a keensert will save a head from being scrap.
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alsdaboss, operator of,
The HELI-MONSTER
All stock
they test my welds by blowin em up.
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