SUPER DUTY
ENGINE PAINT FORMULA

A BIG THANK YOU TO BRIAN FOR PROVIDING THIS
EASIER TO READ PAINT FORMULA
USING DITZLER/PPG PAINTS

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
to make them easy to identify.

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.

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