[60sstuff]

Originally Posted by 60sstuff

I get questions sent to me (I suppose because I own a 66 with the code 614 set up) via email, text, pm, etc. about what is OEM correct for the Air Cleaners and related plumbing on the California sold new 64-65-66 Tri-Power GTO's. I'll attempt to share what I know about this topic.

The system has at least two titles, maybe more;
PCCCVS = Positive Closed Circuit Crankcase Vent System
CPCV = Closed Positive Crankcase Vent


I am no expert but because I have always found these cars interesting, unique and rare I have researched any and all cars, plus their related components that left the plant with this system. It's a topic for me that's fun and one that is confusing to most since the factory application of code 614/K24 (64-65) and 614/616 (66) were few to begin with and most all have been altered (air cleaners, pipes, hoses, caps and clamps) over the decades so there are few remaining examples intact.

The 614 (Sales Code) and K24 (UPC Code) are the Air Cleaners Only with sealed oil fill cap. The 616 (1966 Only) was the above Air Cleaners and A.I.R. = Exhaust Smog System.

This thread was started in the 64-65 Tech section but also includes the 66 model year for obvious reasons. I'm only speaking of the Tri-Power GTO's for now.

Starting on Jan. 1, 1964 all Tempest Series models sold new in California were to be equipped at the factory with a special air cleaner system and a closed crankcase. The Tri-Power GTO's had modified air cleaner bases with the two ends being fitted with a single pipe and the center base fitted with a T pipe fitting. Two small hoses #9784235 connected the end bases to the center base on all the 64-65-66's. A black painted steel vent pipe #9776773 for (64-65) and a molded vent hose #9784820 for (66) connected the center base to the LH valve cover.
For 64-65 the LH valve cover had a small hole stamped in it to accommodate a rubber grommet #9776721 for a snug fit of the vent pipe. 1966 utilized a sealed chrome twist in oil fill cap #6421919 with a swiveled nipple for it's rubber vent hose to clamp to as the RH valve cover was blank. The "sealed oil fill caps" for 64 and 65 were on the RH valve cover. The 64 cap was the chrome AC "Top Hat" style that pushed down onto the oil fill tube. The 65 cap was a chrome flat twist in style that was stamped AC in the center.

Follow-up.

1964 GTO oil filler caps. One year only.

Caps were always on the RH side (passenger).

As already mentioned the 64 “sealed“ oil cap (614) was a small chrome AC push on style.

A much different style 64 oil filler cap was the Standard version.
This cap was also a push on chrome AC cap with a couple unique features.

There were “No” dimples around the outer rim and it had “trapezoid” bottom vents.

1965 had a completely different design.

Chris.