[RAII 4-speed]

I am looking for an original set of tri power screens.
it seems that they are getting hard to find.
So many original tri power set ups for sale but no screens.
where are they all?
anyone with a set that they would like to sell, please let me know
THANKS

[BOB VIDAN]

I'm pretty sure I have a couple if that would help. Advise.

[RAII 4-speed]

PM sent

[RAII 4-speed]

Any photos of originals?
I am curious if they changed thru out the years.

[John V.]

Would be great to see photos of originals, I don't have any screens, so can't help.

AFAIK, the screens were not serviced separately so trying to decipher any screen changes by p/n is not possible.

There is an interesting item in the Nov-Dec. '63 Service Craftsman News pertaining to '59-'63 models with the Heavy Duty Air Cleaner.

This Air Cleaner was large dia. but used a chicken wire screen around which an oiled foam filter element was installed.

The discussion explained that the '64 models were to get a new style screen, the old style screen had a jagged edge which made it difficult to remove the foam element and even more difficult to reinstall the element to overlap both the top and bottom of the screen.

The new for '64 screen added metal trim on the top and bottom so that the edges were smooth.

The SCN recommended that when servicing prior year models, the '64 p/n 6420696 element be recommended to owners when it was necessary to replace a suspect element.

The '66 MPC reflects this change and notes that p/n 6420696 includes the screen.

It also shows that you could still buy a new foam element (p/n 5645166) to use with the old type screen, but required you to reuse the original screen. They had already removed the original p/n 1554864 (foam element with old style screen package) from the MPC, listing the new for '64 6420696 instead to cover the '59-'63 applications. So they had stopped servicing the old style screen.

The point of mentioning this is that I assume right from the start in '64, the new small filter element package used for the GTO tri-power included screens with smooth edges, else they would have suffered the same issue that was addressed for the larger version of this type filter.

The GTO replacement element p/n was 6420700 (Delco A-193-C). There is no mention in the MPC if this element was serviced with new screens, my assumption is that it was, but I don't know for sure.

It was listed for all '64-'66 GTO tri-power applications.

I recall from years back that the repro screens had a different mesh pattern than originals. Not sure if anybody repro'd a perfect match to the original screens.

And having just read the Tiemann tri-power engine detailing article in HPP, it seems the foams are no longer reproduced with the A193C imprinting on them. FWIW.

[Keith Seymore]

I have some originals and can take some photos.

K

[bill ryder]

I don't believe the A193C's were serviced with the screens. The few original 193's were packed in a clear sealed type of plastic bag in a type of oily preservative. You don't find the originals because after almost 50 years, they are mush. A vendor had some empty boxes the bags came in at Dayton this year. He wanted $10.00 for a box!! I have never seen the screens except on original cars. Hope someone posts some pictures. I believe mine are originals. "Bill"!

[60sstuff]

NOS 66 Air Cleaners for the #614 CPCV application. Center unit is complete with screens and foam. Ends are complete without foam.

The repro support screens are very close to originals but do not have the small crimp marks around the inner steel lip like a OEM screen.

The repro foams are also nice and have the A193C on them. They just have never been allowed to put the AC in the circle.

[60sstuff]

All 64,65,66 Tri-Powers used the same bronze mesh screen fastened to a round steel support. The pics below are OEM screens except the last photo showing 3 repro screens without the series of dimples.

Note - The flat bronze screen #6424267 (flame arrester) was issued for the 66 A.I.R. (Smog) GTO's because of backfire issues.

[John V.]

So the 6420700 only included the foam.

Makes sense.

So it looks like the element screens were only serviced with the complete Air Cleaner? Unless they later issued a separate service p/n for them, anybody know?

60sstuff, do you know when p/ns 6424294 and 6424267 p/ns were issued? And what Gr. no.? Was the flame arrester used in production or issued as a service part only? Awesome collection BTW.

The '66 MPC shows a somewhat different set of p/ns and I don't see any separate p/n for the flame arrester screen.

My MPC shows:

'66 except closed c/c or A.I.R. p/n 6422193 (same for all 3 carbs in '66, since all were same size)

'66 with A.I.R. p/n 6422194 front & rear, p/n 6422195 center.

There are separate line items for Closed Crankcase Vent but show the same Air Cleaner p/ns as for the A.I.R. application. Not sure if '66 had a non-A.I.R. closed crankcase application, maybe this was an option on non-Calif cars. In any event, same Air Cleaners as on an A.I.R. application.

[RAII 4-speed]

From the pics that 60s stuff has posted, It looks like the original screens have a better filtration screen than the repro ones.
It also looks like the CCV tube for the center carb has a screen in the middle of it, I will have to check my car (1965) to see if it has one as well.

[RAII 4-speed]

here is a picture of a set of original screens with the first screen blasted clean.

[wmurrell]

Attached is a photo of one of my ’65 screens. They are original to the car. The first owner went back to the dealer in late ’65 and had a metal ram air pan installed on the car. He pulled the screens off, along with the air cleaner bases and put them in a box. They look NOS.
I looked in the ’66 Pontiac Parts Catalog and it shows p/n 642068. It states “SCREEN, air cleaner –w/type A-193C cleaner”, so this is the part number for the assembly.
Bill

[60sstuff]

The flame arrester screens had their own part number (issue 3 per vehicle) of 6424267 as shown in parts book. These were meant to be installed on the Full A.I.R. equipped 66 GTO's with Tri-Power and "Standard Transmission" but were also installed by dealers at no cost if you were to bring your 64-66 Tri-Power car in for service and requested them for "piece of mind". The occassional backfire on the 66 Smog cars resulted in some underhood fires which caused alarm to Pontiac and their customes that owned a Tri-Power car.

RAII, yes the 64-65 center base had the wire mesh inside the tee just as the 66 center base does.

[John V.]

Bill, what is the Revision date on the Page? My Gr. 3.410 stops at the EXTENSION.

You omitted a digit from the Screen p/n, 6420618.

60sstuff, your MPC is obviously later, showing '67 parts, the Note at the end of the listing was also revised from what I have, deletes mention of the original '59-'63 element with screen p/n 1554864 which had the old style jagged screen.

Does yours show the 6424294 p/n or the 6422194 p/n as shown in mine?

EDIT - Based on what I'm reading here, I'm gonna see if I can find some original screens myself!

[wmurrell]

Originally Posted by John V.

Bill, what is the Revision date on the Page? My Gr. 3.410 stops at the EXTENSION.

John...The page shows a revision date of August 1st, 1966. The screens are listed right under the EXTENSION. I have Pontiac Parts Catalogs from several years. If you are looking for a specific part number, drop me an email and I will take a look. I can always copy a page and email it to you.

[geeteeohguy]

RAII: I would advise against bead blasting or sand blasting the screens in any way. Blasting leaves a rough surface that is permanent. Better to use carb dip and maintain the surface integrity.

[RAII 4-speed]

Thanks for the advise but it all depends on how you blast them and what you use to blast with.

[geeteeohguy]

I suppose soda blasting or something similar would be fine. I'm just paranoid about bead blasting, as I've seen a lot of carburetors and aluminum and brass parts ruined by it at swap meets, etc. Knowing your attention to detail and appreciation for your '65, I'm pretty sure we have nothing to worry about!!

[dracowizard]

I'm glad to see pics posted of these screens as I have a set I acquired years ago for my project65.But now that i'm selecting to do the ram air setup i'll not use them. Good to learn more details about them as well.