[poncho-mike]

I need one 455HO air cleaner for my 1972 455HO convertible.

I'm trying to determine if the 455HO air cleaner is a 1971 or 1972. I thought there was a difference between 1971 and 1972, but I don't remember what it is.

I'm not sure what you're asking "No tag or even glue residue on the sides of base?" The no 1 air cleaner has a piece of tape covering the two holes at the back. I'm not sure why it's there. I think that one either hasn't been run, or has been cleaned up before I got it.

[Held for Ransom]

Originally Posted by poncho-mike

I need one 455HO air cleaner for my 1972 455HO convertible.

I'm trying to determine if the 455HO air cleaner is a 1971 or 1972. I thought there was a difference between 1971 and 1972, but I don't remember what it is.

I'm not sure what you're asking "No tag or even glue residue on the sides of base?" The no 1 air cleaner has a piece of tape covering the two holes at the back. I'm not sure why it's there. I think that one either hasn't been run, or has been cleaned up before I got it.

The difference was studs (1971) vs no studs (later in '72) on the diaphragm hold down.
If you have no tag or residue, it's been restored or an over-the-counter replacement. The scalloped hold down didn't show up until the '77 Pontiac air cleaner.

[74SDformula]

This is off of a late '72 Formula.