Converting Back to a PF141 Oil Canister

[Rob A.]

My survivor '67 427/435hp has a spin on oil filter adapter and I am in process of changing it back to the canister style filter. I have a survivor oil canister and purchased the "adapter" from Long Island Corvette. The bolts supplied in the Long Island Corvette were too small (diameter) along with the holes through the "adapter". Has anyone else encountered this?

My solution is to enlarge the holes (drill) through the Long Island adapter and use the bolts I removed from the spin-on adapter. I don't see any issues with this but would like some confirmation if someone else has done this.

[Timothy B.]

Re: Converting Back to a PF141 Oil Canister

Rob,

I am not sure if the adapter/check valve is different than the small block but IMO, I would call Long Island Corvette to inquire why this simple part does not work. If you don't get any joy send it back and look for a nice original part.

[Joe L.]

Re: Converting Back to a PF141 Oil Canister

Rob,

I am not sure if the adapter/check valve is different than the small block but IMO, I would call Long Island Corvette to inquire why this simple part does not work. If you don't get any joy send it back and look for a nice original part.

Timothy-----

Big block and small block are the same with respect to the oil filter valve and attaching parts.

[Joe L.]

Re: Converting Back to a PF141 Oil Canister

My survivor '67 427/435hp has a spin on oil filter adapter and I am in process of changing it back to the canister style filter. I have a survivor oil canister and purchased the "adapter" from Long Island Corvette. The bolts supplied in the Long Island Corvette were too small (diameter) along with the holes through the "adapter". Has anyone else encountered this?

My solution is to enlarge the holes (drill) through the Long Island adapter and use the bolts I removed from the spin-on adapter. I don't see any issues with this but would like some confirmation if someone else has done this.

Rob-------


DO NOT drill out the valve body. What size bolts do you have and do these thread into the tappings in the block?

[Michael G.]

Re: Converting Back to a PF141 Oil Canister

My survivor '67 427/435hp has a spin on oil filter adapter and I am in process of changing it back to the canister style filter. I have a survivor oil canister and purchased the "adapter" from Long Island Corvette. The bolts supplied in the Long Island Corvette were too small (diameter) along with the holes through the "adapter". Has anyone else encountered this?

My solution is to enlarge the holes (drill) through the Long Island adapter and use the bolts I removed from the spin-on adapter. I don't see any issues with this but would like some confirmation if someone else has done this.

In converting back to the original bolt-on style canister, you need to remove the spin-on adapter which fits over the original bypass valve, and replace the two bolts with the original, shorter ones. There should be no difference in diameter, only in length.

[Frank D.]

Re: Converting Back to a PF141 Oil Canister

In converting back to the original bolt-on style canister, you need to remove the spin-on adapter which fits over the original bypass valve, and replace the two bolts with the original, shorter ones. There should be no difference in diameter, only in length.

Exactly what I did with my '63 prior to judging...

[Stuart F.]

Re: Converting Back to a PF141 Oil Canister

If you use the adapter that takes the larger diameter filter, and use a black Wix filter, some will have to look twice and closely to tell the difference.

Stu Fox

[Donald H.]

Re: Converting Back to a PF141 Oil Canister

I changed my 67 small block. Simply removed the spin on adapter and reinstalled the original style adapter/check valve. No bolt issues.

[Rob A.]

Re: Converting Back to a PF141 Oil Canister

Rob-------


DO NOT drill out the valve body. What size bolts do you have and do these thread into the tappings in the block?

Joe,

I just went back and read your response. I reamed the bolt holes in the bypass valve so that the original bolts would pass through it. I have not filled the crankcase with oil yet so if there is an issue in reaming these holes out I can easily correct it before I fire the car up.

The bolt holes in the bypass valve I purchased from Long Island Corvette where too small to accommodate the original bolts and the bolts they supplied with the bypass valve were too small (diameter) to thread into the block.


I can pull it apart and measure the size of the original bolts this weekend. What is the concern with reaming out the holes in the bypass valve? The bolt holes in the bypass valve appeared to have plenty of casting around them.

Thanks for your help and input!! I definitely don't want to mess up the engine.

Rob

[Joe L.]

Re: Converting Back to a PF141 Oil Canister

Joe,

I just went back and read your response. I reamed the bolt holes in the bypass valve so that the original bolts would pass through it. I have not filled the crankcase with oil yet so if there is an issue in reaming these holes out I can easily correct it before I fire the car up.

The bolt holes in the bypass valve I purchased from Long Island Corvette where too small to accommodate the original bolts and the bolts they supplied with the bypass valve were too small (diameter) to thread into the block.


I can pull it apart and measure the size of the original bolts this weekend. What is the concern with reaming out the holes in the bypass valve? The bolt holes in the bypass valve appeared to have plenty of casting around them.

Thanks for your help and input!! I definitely don't want to mess up the engine.

Rob

Rob------

It should not be necessary to enlarge the holes in the valve in order to make it work. If one has to do this, I would otherwise question the quality or applicability of the valve. The fact that the supplied bolts also were the wrong size for the tappings in the block seems really crazy to me.

In any event, my concern with reaming out the holes had several bases: (1) weakening the casting and, (2) if you modify it then you can't return it. Well, you've already done that so, at this point, I guess you need to just go ahead and see if everything works OK. I suspect it will.

[Donald H.]

Re: Converting Back to a PF141 Oil Canister

If you used the bypass valve kit as pictured below, they come with the correct bolts. The bolts are 1/4"-20. If what you are saying are the original bolts and they are bigger than 1/4-20 then it is possible someone tapped the block for larger bolts.

[Rob A.]

Re: Converting Back to a PF141 Oil Canister

If you used the bypass valve kit as pictured below, they come with the correct bolts. The bolts are 1/4"-20. If what you are saying are the original bolts and they are bigger than 1/4-20 then it is possible someone tapped the block for larger bolts.

Yep, that is the kit and the bolts supplied. The block very well could have been drilled and tapped for larger bolts.

The block is tapped for a 5/16" bolts. I did not have to remove too much material from the bypass valve to make it work with the 5/16" bolts.

What is the exact function of this bypass valve? I assume it diverts oil flow back to the pan without going through the filter should a filter become plugged so it does not starve the engine.

The load that this diverter valve sees cannot be that great. Hence the factory 1/4"x20 bolts.

[Harry S.]

Re: Converting Back to a PF141 Oil Canister

Not trying to hijack the thread but a quick question. Since my 63 is finished judging I'm going back to a spin-on filter. I looked at my spin-on adapter and the two gaskets are shot. I've looked all over the internet, anyone know where I can get replacement gaskets. It's for a Mr. Gasket 1270.

Thanks

[Joe L.]

Re: Converting Back to a PF141 Oil Canister

Harry----

The only thing I could suggest is e-mailing Mr. Gasket and ask if they will sell you the gaskets separately. I doubt these gaskets are otherwise available. Or, you could use something like Permatex Form-A-Gasket.

[Harry S.]

Re: Converting Back to a PF141 Oil Canister

Joe, thanks.

I've been looking for the Mr. Gasket Company or Parent and can't seem to find one. All I get is a company of 4 people in Cleveland that distribute the kit. Must be an import that is no longer made here.

Holley now owns Mr. Gasket