66 got engine swap

[1972RedNeck]

What the hydraulic pump for?

[markeb01]

Originally Posted by 1972RedNeck

What the hydraulic pump for?

I believe you're looking at the smog pump/air pump. It was part of the emissions equipment. Most people tossed them out, and the complete original setup can be very hard to find on certain restorations (like Corvettes):

http://www.oreillyauto.com/site/c/de...word=smog+pump

The Wikipedia description sums up its purpose:

"Secondary air injection (commonly known as air injection, or colloquially smog pump) is a vehicle emissions control strategy introduced in 1966, wherein fresh air is injected into the exhaust stream to allow for a fuller combustion of exhaust gases".