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Ever seen two factory painted engines in SH orange be different shades? What's correct?



Yes it varied, but not a ton, we are talking slight variations. There are plenty of durable paints out there, no doubt much better than rattle can or original paint on engines in terms of quality. However, MOST of todays aftermarket blends are not even close to matching any range of factory color shades, and custom flattening agents aside, are usually a mile off on the amount of gloss as well (a couple reasons that likely lead Dave Walden to match his own blend to original engine paint). So what it boils down to is that it really depends on what your priorities are.