PF-29 Filter For 68 And PF-25 For 69

[Michael H.]

Scan of a 1969 printing of the parts book shows the PF-29 used for the 1968 MY and PF-25 for 69 MY. It is possible that the PF-11 was used early in 68 but I don't have any info on that. (interesting that a Corvette only parts book notes that the 58-67 filter is used with 4 wheel drive and the 68 filter is not used for taxi. the old books were full of errors)

[Robert Jorjorian]

Re: PF-29 Filter For 68 And PF-25 For 69

Michael thats for sure.
If you read the 1969 Corvette PF25 line its listed as 1 PINT capacity.

[Mike McKown]

Note #1

Contains the passage about some '68 cars used '67 engines. Early in the model to use up inventory. I believe this is a little known or forgotten fact. These engines used the small journal mains and cannister filter if I'm not mistaken. I don't know if any Corvettes are affected or not.

[Michael H.]

Re: Note #1

Mike,

I've often wondered the same thing. I would guess that this only occured in the high volume 283 pass car but I suppose anything is possible. If indeed this did occur in Corvette, it would certainly make for some heated debates during judging. Wonder if the Flint stamp on the ID pad would indicate a 67 code or a 68?

[Michael H.]

Re: PF-29 Filter For 68 And PF-25 For 69

Yup, the PF-29 is shown as 1 quart and the PF-25 as 1 pint. I very vividly remember my new 68 Z28 having a one quart oil filter. Wish I could remember more detais about it but I don't even remember what color the filter was painted.

[Tom S.]

Re: PF-29 Filter For 68 And PF-25 For 69

I would like to buy or even see one of those 4.w.d. Corvette's.. Tom

[Michael H.]

Re: PF-29 Filter For 68 And PF-25 For 69

I remember seeing a C3 for sale in some "Auto Trader" magazine about 15 years ago that had been converted to 4WD. Sat about two feet higher than normal with big mud tires and looked really bad. Sometimes, after eating really spicy food, I have nightmares about that car.

[Patrick H.]

Re: PF-29 Filter For 68 And PF-25 For 69

There was one for sale on line near me about 2-3 years ago that sold just as I was going to drive by and take a look. So, they do "exist."

Patrick

[Mike McKown]

Re: Note #1

There was a TSB on it, I think. At least I have possession of some document that describes this action. 327 engines were the only ones involved. The 283 was phased out in '67 and replaced by the 307 in '68.

I was looking for the documentation three days ago for another purpose. I just haven't found it yet.

[Michael H.]

Re: Note #1

I just thought of another point. If 67 blocks were used for these early 68's, were the rear crankcase holes drilled? If so, how were they plugged for the new 68 crankcase vent system? The 68 block still had the pad where the original hole was but it wasn't drilled.

[Mike McKown]

The parts book says

These engines meet '69 specs except as follows:

cylinder and case assy

conn rod assy

crankshaft assy

main and conn rod bearings

replaceable element oil filters, by-pass valve and related parts. These (engines) can be identified by the oil filter. Refer to the above 1967 components in their respective group.

Soooo, it looks like the crankcase breathing system is not included. This notation is listed under the fitted block replacement for '62-'67 Corvette, ex. hp, shp and FI.

This isn't the document I have been looking for, however.

There was a question raised the other day about small crank journal 327's and I wanted to shed a little light on it.

[Michael H.]

Re: The parts book says

Ok, sounds like the cyl case is a 67 with the large hole in the upper rear for the 67 style breather tube. Wonder if it was plugged in production at Flint for those early 68's?

If the left over 67 block used for early 68 meet the new specs "except as follows", there really isn't much left that's different than 67.

[John H.]

Re: The parts book says

I remember that TSB too, and it's buried somewhere in my collection of "Vette Vues" TSB reprints; as I recall, it only applied to some number of passenger car engines, not to Corvette applications.

[Joe L.]

Re: PF-29 Filter For 68 And PF-25 For 69

Michael-----

Yes, this information is partly what I used to quite some time ago conclude that the PF-29 was used for 1968 Corvettes and, very likely, early 1969 Corvettes, too. However, there were several other things I researched. There should be a post somewhere in the archives on this; as I recall, I posted a very lengthy and extensive set of rationale and conclusions which convinced me that 1968 Corvettes originally used the PF-29 filter and not the PF-25 as has been long-thought.

Also, there is no error in the P&A Catalogs regading the use of the canister style filter on 4 wheel drive applications and taxis. While most passenger cars converted to the spin-on filter in 1968, many trucks, taxis and police cars did not---they continued to use the canister style filter through the 1969 model year. This had absolutely nothing to do with the use of the 67 and earlier style blocks, either. A special adapter was used which facilitated the use of the canister syle filter on blocks designed for spin-on filters. This adapter was originally GM #3915163 and, later, GM #3951626.

[Michael H.]

Re: PF-29 Filter For 68 And PF-25 For 69

Joe,

The book is indeed in error. The portion of the page that I posted was from a 1969 Corvette only parts book.