Embossed PF 25 oil filters - my solution to $900 oil filters.

[ric1969]

You keep coming up with good work James well done.

[68camaroz28]

If not mistaken 1968 and early 1969 model year would have had a PF 29 filter, which were not embossed, which is odd as the 1967-1968 version of the AC PF24 (pontiac filter) is embossed.

In the NCRS a 69 and 70 without an embossed filter will lose 5 points for configuration.
The reproduction AC PF 25 with the dime sized circular impression on the bottom will lose 5 points for configuration for 1971-1977.
to be correct for 71-77 The circular impression on the bottom of the filter can needs to be about the size of a silver dollar -
as shown in the center of the mold bottom without the embossing - the center circle size is easily larger than a dime. 

Yes ours as shown in build thread used a pf-29 for 68. My only reference was that the pf-25 embossed filter back 6 or so years ago ncrs could not conclude it was primarily used so embossed or not was accepted for pf-25 equipped corvettes.

[Dave69x33]

firstgenaddict,

Again, nice work!


CantRepeat,

Sorry for the delayed response.  I worked with a local cylinder head specialist to do my head work.  He formerly worked at Indy Cylinder Head, and while he worked for the Jegs Pro Stock Team, help design the Hemi Pro-Stock Heads.  He recommended the cam and the following Comp Cams valve train components based on what I was after with my motor - close to stock but upgraded.
 - Rockers: #1804-16 CS 1.5 ratio 7/16" Ultra Pro Mag XD
 - Springs: #977-16
 - Roller Lifters: #818-16 CS Supper
 - Push Rods:  don't recall the item number but ordered custom length after mock up and using an adjustable rod to get the proper contact pattern across
   the top of the valve stem.
 - The build required machining the poly-lock rocker arm nuts about 0.080" to gain the approx. 0.100" clearance under the stock valve covers
 - Also required a thicker valve cover gasket to gain the clearance noted above   

BTW...You can search on YouTube for sound bites with Comp Cams CS XR274 R10 to hear it in my Z28.  I tried unsuccessfully to hear what it would sound like in a performance small block Chevrolet before I purchased it, but took the chance with this cam based on the recommendation I received.  My goal was to retain the vintage solid lifter sound but with an upgrade to modern cam technology and performance.  The fact I was retaining my stock exhaust manifolds and exhaust system also played a part on my cam selection.

[David K]

I’ll take 5 of those custom oil filters please. Those $900 ones aren’t good enough for my 6 cylinder engine.

[firstgenaddict]

I’ll take 5 of those custom oil filters please. Those $900 ones aren’t good enough for my 6 cylinder engine.

At my labor rate it works out to about $300 in labor PER FILTER.

[Charley PHX]

The molded end cap is pure genius! NICE WORK!

[Edgemontvillage]

James, you may have understated the rising cost of these filters judging by this recent (July 17. 2022) eBay sale: