I know this question has been asked a thousand times, but I have never found a straight answer.

What year cars had the standard thread cylinders and which years were metric?

Could they be mixed standard and metric in the same year?

What is the RPO code, if there is one, that says the cylinders are metric or standard?

 

Changeover was 84 MY.

Not impossible that there are some 84s still w SAE fittings but I haven't ever seen one.

Never seen one mixed. Being a manufacturing engineer in my spare time (8-5 M-F) I can't begin to imagine how unlikely such a thing is. You'd have to have stuff like a single piece of tubing that was different sizes at both ends and stuff like that. BEYOND NIGHTMARE on a production line. If I were the betting kind (I'm not... one of my other hobbies is teaching university statistics) I'd be willing to bet ALOT of money that no such thing ever existed.

No RPO code for that.

 

sofakingdom: There's something wrong with you. It's not possible for the same guy to have both mega-spaz technical knowledge, and side splitting wit.

 

I didn't mean mixed on the same car. I meant a mid year change, like first half of the year be standard and the second half be metric.

Anyway, I called and spoke to a parts guy at the local GM dealer today and got some good information.

Funny thing is the GM parts department at the local Chevrolet dealer couldn't figure out if the car would be metric or standard.

By the way, he did say that standard was used on Camaro and Firebird models from '82-'88 and metric was used from '84 to '92.

The parts guy also said it is possible that one car could be standard and another car be metric in the same year from '84 to '88. So, there is a 5 model year over lap where both type cylinders were used.

My car has the metric set and they have to be ordered. None of the parts stores around here stock the metric, they do stock the standard though.