There was an article in the AMCA AMgazine a couple of issues ago describing the use of Goodson's coil-insert valve guide system in lieu of changing valve guides. I've routinely changed guides for many, many years as part of my motor/top end rebuilds. However, the tolerances described in the article seemed too good to be true. To me, it seemes more and more evident that the descructive act of removing and re-installing valve guides in aluminum heads seem like one that we should start to avoid, even when the heads are pre-heated and the task is properly executed.
The ability to remove and replace coil-inserts is intrieging, especially if the stated tight tolerances can be used. But.... the article seemed to be geared to side valve models.
I might consider this system for my own machines, but before spending any money I thought I would reach out with a few questions;
1. Has anyone personally used these inserts on overhead models, specifically Knuckle Hheads, Pan Heads, Shovel Heads and Iron Head Sportsters?
2. If so, was the installation as straight-forward as described?
3. Can you actually use the valve stem-to-guide clearances stated?
4. How did the installation (s) work out? Did the valves perform well over the long-haul or was valve stem galling an issue?
5. Given the tight stem fit-up, was the use of valve seals required?
Thanks
The ability to remove and replace coil-inserts is intrieging, especially if the stated tight tolerances can be used. But.... the article seemed to be geared to side valve models.
I might consider this system for my own machines, but before spending any money I thought I would reach out with a few questions;
1. Has anyone personally used these inserts on overhead models, specifically Knuckle Hheads, Pan Heads, Shovel Heads and Iron Head Sportsters?
2. If so, was the installation as straight-forward as described?
3. Can you actually use the valve stem-to-guide clearances stated?
4. How did the installation (s) work out? Did the valves perform well over the long-haul or was valve stem galling an issue?
5. Given the tight stem fit-up, was the use of valve seals required?
Thanks
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