Thanks for the compliments on the shop.....its not always this clean and organized when things get rolling!! The downsides to too tight? Galling against the crank would be the downside, but I've never run into that failure before. I would think you're OK at the .008".
I have seen and assembled engines with more than .020" on plenty of stock rod engines.
I have one engine with an old set of CAT rods and CAT crank that has .018 side clearance. Noisy as hell until it gets good and hot and the side clearance gets tighter. Another engine with Molnar rods and an RPM crank that is too tight at .006, which is the minimum spec for stock rods. .010-.011 seems to be the perfect clearance.
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