['ol Pinion head]

Above dual snorkel aircleaner is '70 GTO- 455 GP and 70 B series 455 w 64 heads.
A shown above, without CA emissions vent provision. By late in the '70 model year, this style aircleaner base had the small round hole in it to mate with the propper CA emission Qjet. on 49 state builds this small plastic plug remained in the hole. Fremont assembly workers were to remove the small plug if CA emissions Qjet was used.

For '71 Pontiac 400 4bbl & 455 Dport A-body's & 455 GPs, the same dimensional & appearance dual snorkel aircleaner was used (always has the small hole for the airhorn vent). Did use a different part number than the '70 application air cleaners.