They were with out a doubt on the consoles of L88's which have 12.5:1 compression thus requiring 103.
KURT I guess the question would be regarding ZL1's... were they 12.5:1 compression as well? I ONLY ASK because of the way the ZL1's are listed on the CORVETTE TANK SHEET - ALUM CYL CASE
If so one would believe the decal would have been somewhere.