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SleepCounter · 9-6-04, 3:27

There are two different manufacturers that I know of: Heli-Coil (left) and Perma-Coil (right). Both come in a kit which includes a special tap, an insertion tool and a dozen coils.

The Helicoil insertion tool is plastic and seems not at all sturdy, the PermaCoil tool is steel but needs to be held in a tap wrench to enable it to be turned.
The coils, taps and insertion tools are interchangeable between those two manufacturers. For your exhaust manifold, you'll need M8-1.25 (8 mm diameter, 1.25 mm pitch) kit.

If you decide to go into the head repair business, you can buy extra coils separately, but the insertion tools and taps seem (in my experience) to be readily available only in the kits.

9-6-04, 3:27	#2 (permalink)
SleepCounter Banned Join Date: Mar 2003 Location: Calgary, AB, Canada iTrader: (0)	Chapter deux There are two different manufacturers that I know of: Heli-Coil (left) and Perma-Coil (right). Both come in a kit which includes a special tap, an insertion tool and a dozen coils. The Helicoil insertion tool is plastic and seems not at all sturdy, the PermaCoil tool is steel but needs to be held in a tap wrench to enable it to be turned. The coils, taps and insertion tools are interchangeable between those two manufacturers. For your exhaust manifold, you'll need M8-1.25 (8 mm diameter, 1.25 mm pitch) kit. If you decide to go into the head repair business, you can buy extra coils separately, but the insertion tools and taps seem (in my experience) to be readily available only in the kits.