SUPER DUTY
ENGINE PAINT FORMULA
A BIG THANK YOU TO BRIAN FOR PROVIDING THIS According to Pontiac Dealer Technical Bulletin 73-T-21 dated March 15, 1973, the EPA demanded some mid-year emission changes be put into effect. The changes relating to the Super Duty 455 engines required the removal of the time delay solenoid (mentioned on my Trivia page), a redesign of the EGR Valve and the engines were to be painted a darker shade of blue It seems that the 73 Super Duty cars were built in June, July and August, so ALL the SD cars, 73 & 74, should be the darker blue. There have been a few owners claiming to own early March built cars, however, the sequence number in their VIN does not support their claim. This does not mean that there were no Pre-March SD engines. In fact, some of the earliest stick shift SD455s were built with a 98.21 CC head instead of the 112.30 CC heads the SD ultimately ended up with. But these were not production engines and have most likely become a part of Pontiac history. The contents of this site are copyright© 2000, Jamos1/Superduty455.com
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