I had a solid tappet freeze in a BBC once and it wiped out the lobe on the cam but it showed obvious signs on the tappet. Unlikely that all the intakes would stop turning?
wow looks like the regrind that came out of my truck after only 2k miles, and that time i didnt have 60lb springs. i wouldnt put another regrind in my truck recommend it if i was paid to!
