Two summit cams this year. One on my son's 75 Malibu with a two barrel SBC and the other in a friends 71 Monte with a 396. Both are doing fine.
Run HFT on all my junk and not really much issues. If the lifters do not rotate you know you have a problrm long before grinding things down. A magnetic drain plug and cutting your oil filter open so things do not sneak up on you doesn't hurt either.
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