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It was a GM accessory code area on the Cowl Tags. They used that specific area to put Z28 on the Cowl Tag for the 78 Camaro. In 79 the Camaro had only a Z notation in that area to represent a Z28. However, in Pontiac motors from Van Nuy's, CA it was called a "back Code".Here is what I read about the U3 identifier back code and a link to the source where I found it;"The other two engines in the line up were essentially carryover for 1978. The automatic only 185 horsepower (RPO L80) 403 cubic inch Oldsmobile engine was back (coded U2, U3, VA, VB ) and still the only engine California and residents living in Government deemed high altitudes could order. The L78 Pontiac 400 was the base engine (coded YA or YU ), but now it's 180 hp could be combined with either an automatic or manual."The site is:http://www.iwaynet.net/~gl&lisk/1978ta.html is where I found this codes meaning. You can look at it when you get a chance.I am sure the Hitman would have gotten back to you in a few minutes on this one with the same answer if he were'nt so busy. Hope this helps answer your question. Hammer
my Van Nuys has a WS4 stamp.are you sure it's a Trans Am and not just a Firebird?