I love powermaster starters over GM.
I have no experience with LS motors.
I run BBC.
That being said,
My first GM starter was axially offset and no shimming could fix it.
I went with Powermaster because:
1. I can adjust axial offset.
2. I can clock the starter.
3. I can use all three bolts to secure starter to block.
(I just bought a new AC/Delco starter for my zero turn and it has a stamp:
Made in Korea)
I realize this thread is old but wanted to add this bit of info. If you're using an early Quicktime bellhousing for a Magnum transmission with a *round* hole for the starter, an LS3 starter may cause some interference to fit. The earlier LS1 starter mounts about 1/8" differently and fits perfectly to both the engine, flywheel, and bellhousing. Later Quicktime bellhousings have an oval opening for the starter so the LS3 starter will fit, no problem.
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