72 L48 oil filter reproduction

[Edward J.]

What do you think C3 guys think of this Filter IMG_1473.jpgIMG_1474.jpggot it years ago from Rich Fortner. will judge with some of the points? does not have any thing on bottom which i believe that's correct for my 72??

[Jerome P.]

Re: 72 L48 oil filter reproduction

My filter. I purchased it new 15/16 years ago. I believe it to be correct. Only installed on the car for judging meet reasons. Last judged in a Regional judging meet Tucson, AZ about 8/10 years ago. No deductions.
IMG_0210.jpgIMG_0209.jpgIMG_0211.jpg

[Tom R.]

Re: 72 L48 oil filter reproduction

My filter. I purchased it new 15/16 years ago. I believe it to be correct. Only installed on the car for judging meet reasons. Last judged in a Regional judging meet Tucson, AZ about 8/10 years ago. No deductions.

Oil filter discussion can get interesting. What I see in Jerome's oil filter is a lock seam (ridge) that is painted. Original PF25s of the period did not have the painted lock seam. Ed's PF 25 is more "typical" of what one would have found on a factory installed oil filter in 72. Below is a PF25 removed from its over the counter box (that date codes its availability) but note that lock seam is unpainted.

PF25_white.jpg

[Jerome P.]

[Dave S.]

Re: 72 L48 oil filter reproduction

From what I see Ed's is a reproduction filter with the paint removed from the crimp. As Tom says and I agree is Jerome's filter is also a reproduction with the painted crimp and crisp lettering. On Tom's original filter notice the lack of quality on all the silkscreened red, white and blue. That defines an original AC filter.

[Terry M.]

Re: 72 L48 oil filter reproduction

just a thought, does the filter fit into the block such that the lock seam is not visible for judging? If you know, you would save me the aggravation of crawling under the car.

thanks Tom.

It has been many years since I judged chassis, but I believe the lock seam is NOT visible when the filter is installed.

Now lets get to talking about the size of the flat spot on the bottom of the filter.

[Jerome P.]

Re: 72 L48 oil filter reproduction

unanswered question : Both your filter and Ed’s are close to being Snow White. Mine is not. Should I consider mine still good for “no deduct” judging? Based on your belief I should have received some points being deducted, correct? And maybe for the off white color.

Terry, what is the dimension of the flat spot? Knowing now that mine is not an ordinal, I am going to measure mine.

[Jerome P.]

[Terry M.]

Re: 72 L48 oil filter reproduction

Terry, what is the dimension of the flat spot? Knowing now that mine is not an ordinal, I am going to measure mine.

The 1970-72 TIM&JG 6yh Edition Page 218 says the flat spot on a PF-25 is 1.5-inches in diameter.

[Jerome P.]

Re: 72 L48 oil filter reproduction

Thanks Terry. I do not have the 6th edition, the 5th edition seems to indicate there is some wiggly room on the dimension. It says about 1-1/2 inches. Just curious if the 6th uses the same wording? Either way I probably paid to much for what I now know is a knock off.

thanks again for chiming in.

[Ron G.]

Re: 72 L48 oil filter reproduction

Jerry,

The sixth edition also says that on the bottom of the filter it has a flattened section in the center about 1 1/2 inches across.

[Joe L.]

Re: 72 L48 oil filter reproduction

Jerry,

The sixth edition also says that on the bottom of the filter it has a flattened section in the center about 1 1/2 inches across.

Ron------


Yes, the round flat on the bottom of the filter can is a very reliable way of discerning original filters from reproductions or later replacements. The flat on the bottom of AC Delco PF-25 and PF-35 filters for at least the last 25 years has been 7/8" or less in diameter. Presumably, the reproductions are made from current filters re-silk-screened as I expect the cost of making the entire filter from scratch would be prohibitive. All of the non-Delco aftermarket filters I have checked also have the smaller round center flat.

One other thing: while the size of the round center flat is an instantly observable giveaway, I THINK the the number/configuration of the wrench flats on the lower side of the filter can is also slightly different between originals and current filters.

[Terry M.]

Re: 72 L48 oil filter reproduction

Jerome
Quibbling regarding the word about is beyond the scope and intent of the TIM&JG. Judges are expressly forbidden to use rulers when judging, and given the location of the oil filter (a mirror will be needed to see the flat spot on the filter) one would need to be quite agile to effectively see that flat spot with any accuracy.

The TIM&JG is NOT a blueprint for restoration. That is why it is called a GUIDE.

[Joe L.]

Re: 72 L48 oil filter reproduction

Jerome
Quibbling regarding the word about is beyond the scope and intent of the TIM&JG. Judges are expressly forbidden to use rulers when judging, and given the location of the oil filter (a mirror will be needed to see the flat spot on the filter) one would need to be quite agile to effectively see that flat spot with any accuracy.

The TIM&JG is NOT a blueprint for restoration. That is why it is called a GUIDE.

Terry------


I've always considered that trying to judge anything on most of the chassis of a Corvette would be difficult.

I did not know that the use of rulers in judging was not allowed but I'm glad to hear that it is. Using a ruler would be what I would call a quantitative technique in an endeavor that only qualitative techniques are appropriate. Same thing should hold true for magnets.

In any event, as far as the oil filter goes and assuming it can be seen, no ruler is necessary to discern the difference in size of the bottom round flat----it can be discerned at a glance.

[Terry M.]

Re: 72 L48 oil filter reproduction

Terry------


I've always considered that trying to judge anything on most of the chassis of a Corvette would be difficult.

I did not know that the use of rulers in judging was not allowed but I'm glad to hear that it is. Using a ruler would be what I would call a quantitative technique in an endeavor that only qualitative techniques are appropriate. Same thing should hold true for magnets.

In any event, as far as the oil filter goes and assuming it can be seen, no ruler is necessary to discern the difference in size of the bottom round flat----it can be discerned at a glance.

Technically magnets are forbidden also, but some judges sneak them in anyway. They are far less obvious than rulers or other measuring devices.

I am not so sure the difference between 1 1/2 and 1 5/8 inch can be discerned on the bottom of an installed oil filter, but I will leave that to individuals who are more agile than I. If one were looking for the difference between 7/8 and 1 1/2 I could agree. However, we routinely discern the difference between antenna balls. The smaller later size is 0.200 and the original size is 0.250. A look down the line of cars easily discerns this difference, but then one is making this assessment standing with the ball at eye level. That is far different circumstances than what is required to see the bottom of the oil filer.