In the late 1980s he again sang with original members of The Diamonds and also returned to The Four Preps with Bruce Belland, Ed Cobb and Jim Yester of The Association.
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With Ed Cobb of the Four Preps, Mayorga also branched out into instrumental rock and roll, forming The Piltdown Men, a studio group whose "Brontosaurus Stomp" made the Billboard Hot 100 in 1960 and whose other records had greater success in the UK charts.