Deve's Technical Network
Advance Design Chevy Trucks
(1947-1955 1st Series w/ some TF)

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Installing a Spin-on Oil Filter on your Old Chevy

There are four different options for installing a Spin-on type oil filter for your 1940-1962 Chevy Six. This has to do with two factors. If you have the stock Bypass Filtration system and if you have a triangular engine mounting boss on the drivers side of the engine. Chevy started putting this side mount on Cars in 1952 so check to see if your 216, 235 or 261 has this triangular mounting boss arrangement. If it does not have this, don't worry, we have a solution for you too!

The challenge in creating anything for these wonderful works of art is making sure we do not make the installation look too modern or out of place. Once these brackets have been installed, they look just like they belong there. In addition, the mounts are all made purposely to be low on the engine. This keeps the oil pump from having to push oil upwards unnecessarily which is better for the overall health and oil flow performance of the engine.

Choosing the Right Spin-on Oil Filter Solution for Your Vintage Vehicle

Solution One: If you have a stock Bypass oil filtration system, and you do NOT have a triangular engine mounting boss, this bracket fits on to the vehicle's frame directly across from where the triangular mounting would be, just aft of the generator/alternator. Mount this bracket on the top flat of the frame just before it makes its bend downwards. It straddles the frame and two bolts clamp it in place. Our favored Trans-Dapt 1028 Spin-On Adapter is used but with a modification for Bypass Filtration that reduces the outlet port to 1/16" to work exactly like the stock system. Slide the bracket as far forward as possible away from the exhaust. To efficiently get around the exhaust system, a 1/8" NPT 5 inch Stainless Steel pipe is used with a Stainless Tee connection for connecting to the Oil Pressure Gauge. All fittings except the -4AN fittings at the Adapter are Stainless Steel. If you choose, you can purchase the bracket and adapter and use your own stock hoses!


To install the bracket with the Trans-Dapt 1028 Spin On Adapter, make sure the clamping bolts are loose and turned out enough to slide over the frame. Start sliding it on just in front of the steering gearbox and slide it over until it stops because the frame takes a bend downwards. If your frame has lots of dirt or excess paint it will be harder to slide on. Tighten the two bolts to secure it to the frame, then lock the nuts down to keep the bolt from loosening. Once the bracket with adapter is secure, install the 5 inch stainless steel 1/8" NPT pipe directly to the engine block in the aft (oil flow OUT) port. No need to use a pipe wrench on it just yet. Install the Tee on the end of the pipe. Use teflon tape that is rated for oil or Permatex Copper High Temp Gasket Sealer on the threads. Turn the Tee and the pipe by hand until the pipe is tight in the engine block, then using a pipe wrench, turn the Tee until it is tight and straight, parallel with the engine and frame. Do not over-tighten! Install the 1/8" NPT to -4 AN Adapter into the front of the Tee, and the 1/8" NPT plug (or your oil pressure gauge hookup) into the back of the Tee. Install a 1/8" NPT to -4 AN adapter to the front inlet on the engine block (oil flow IN). Since the Trans-Dapt is already configured, it's a simple matter of just attaching the stainless steel braided flex hose. Be sure to keep the flex line as far away from the exhaust as possible. This kit is available in two flavors: With Stainless Braided Hoses, and Without. As always, we can work with you on your particular build.



Solution Two: If you have a Bypass oil filtration system and you also have the Triangular front engine mounting bosses that are not used and are tapped for 3/8"-16 threads (stock) this bracket bolts directly to this location. Our favored Trans-Dapt 1028 Spin-On Adapter is used but with a modification for Bypass Filtration that reduces the outlet port to 1/16" to work exactly like the stock system. To efficiently get around the exhaust system, a 5 inch pipe is used with a Tee connection for connection to the Oil Pressure Gauge. All fittings except the -4AN fittings at the Adapter are Stainless Steel as shown above. If you choose, you can purchase the bracket and adapter and use your own stock hoses! This solution is for the Triangle Side Engine Mount that has ONE hole at the top and TWO holes on the bottom in a perfect triangle.


Install the bracket to the block using the supplied stainless steel 3/8" bolts with lock washers. After you have the bracket tight, install the Trans-Dapt 1028 to the bracket leaving the two nuts on each screw for standoffs. Tighten securely. Once the bracket with adapter is secure, install the 5 inch stainless steel 1/8" NPT pipe directly to the engine block in the aft (oil flow OUT) port. No need to use a pipe wrench on it just yet. Install the Tee on the end of the pipe. Use teflon tape that is rated for oil or Permatex Copper High Temp Gasket Sealer on the threads. Turn the Tee and the pipe by hand until the pipe is tight in the engine block, then using a pipe wrench, turn the Tee until it is tight and straight, parallel with the engine and frame. Do not over-tighten! Install the 1/8" NPT to -4 AN Adapter into the front of the Tee, and the 1/8" NPT plug (or your oil pressure gauge hookup) into the back of the Tee. Install a 1/8" NPT to -4 AN adapter to the front inlet on the engine block (oil flow IN). Since the Trans-Dapt is already configured, it's a simple matter of just attaching the stainless steel braided flex hose. Be sure to keep the flex line as far away from the exhaust as possible. This kit is available in two flavors: With Stainless Braided Hoses, and Without. As always, we can work with you on your particular build.



Solution Three: If you have a Full Flow Oil Filtration System on your 1954-1962 235 or 261 full pressure oil system we use the same Trans-Dapt 1028 with either bracket above. The difference is that 3/8" NPT lines and adapters to -6 AN are used and the 1/16" restrictor is not installed.


Install the Triangle bracket using the supplied stainless steel 3/8" bolts to the triangular mounting boss. Tighten securely. Install the Trans-Dapt 1028 leaving two nuts on the 1/4" screws for standoffs. Tighten securely. If you are using the clamp-on bracket, slide it on the top rail of the frame just forward of the steering gearbox and move it as far forward as you can before the downward turn on the frame prevents further adjustment. If you have a 261 with the large 1/2" NPT oil in/outlets, install the 1/2" NPT to 3/8" NPT reducers on the engine block, then on the rearmost fitting, install the 5" Pipe and Tee Connector. Tighten so that the Tee is Parallel to the engine and frame. Use Teflon tape approved for Oil, or Permatex High Temp Copper Gasket Sealer on the threads. Next install a 3/8" to -6AN Adapter on the front engine block fitting and another one on the Tee. Install either the Oil Pressure Gauge or the included plug on the back of the Tee. Install the hoses and tighten securely.

Note: If you have a 235 with 3/8" NPT in/outlets then the 1/2" reducers do not apply at the block.


I want to explain how to install a Trans-Dapt 1028 Spin-On Oil Filter Adapter after modifying the engine block for full flow oil filtration. I found a really cool place to put the adapter. The newer 235 engines have a triangular side engine mounting boss. Three 3/8" bolts are used to hold the engine in place on a newer style truck. Since we are setting this engine up for 1947-1955, the engine will be mounted at the front on the timing plate. This leaves those three holes for us to mount our Spin-On adapter direct to the engine. This is the best way because any torquing or engine movement will not cause stress on the adapter or hoses. It would be nice if they made an Spin-On Oil Filter Adapter that just had that bolt pattern, but no, we have to make an adapter for the adapter! Not really much problem if you have rudimentary metal working tools. If you don't, you can always purchase a complete or even partial kit from us. Meanwhile, to make this thing, we need some 1/8" plate, some cardboard, some hardware and some patience. Start by placing a piece of cardboard up against these triangular bosses and hold it very firmly, take a hammer and just tap around the cardboard to get the pattern. Use a ball peen hammer to tap inside the holes so that they also show really well. Once you have the outside pattern as well as the hole pattern, cut it out with scissors and place it over your 1/8" plate.


With a band saw or whatever you use to cut the metal, cut your triangle out, then position your center punch in the center of your hole pattern (I just placethe cardboard over the metal and center punch both), and drill your 3 engine mounting holes to 13/32". This is two fractional sizes larger and should forgive very slight mis-measurement. Once those holes are drilled, it's time to mark the plate for the 3 triangular adapter hole pattern. This is a little tricky, but lay it out as shown and just stay away from the larger holes as much as possible. There IS room for the heads of both patterns to NOT interfere with each other. Drill these holes out to 9/32" which is two up from 1/4". Test to make sure they line up perfectly with the adapter. I found that 3 of 7/16" lug nuts work best for the standoffs. They work perfect because of the bevel. Perfect for welding the bead around them to secure to the plate. Once you have tested your holes on the engine block and everything is right, weld the lug nuts on the plate, then test it on the engine block again. Use 3 of 3/8 x 1-1/4" Bolts for the engine block part.


Next get three 1/4" x 1-1/4" grade 5 bolts. The problem with these bolts is they are usually not threaded all the way up, and we need them to be. So, if you can't find any bolts that thread all the way, get out your 1/4" x 20 tap and finish the job. If you use oil and take your time, the nuts will turn easily all the way down. Install these bolts in so they stick out opposite the lug nuts as shown. Run one nut all the way down and tighten the bolt to the plate. Run a second nut down on to the first nut securely. This is used for the proper standoff so the engine bolt head has room. Paint the piece to keep it from rusting. This is the perfect location for the adapter and doesn't interfere with anything when it's mounted. The last thing you will need to do is figure out the fittings you need to install the hoses. I am using 1/2" NPT (the inlet/outlet holes in the adapter) to -6AN adapters so that I can hook up 3/8" stainless braided hose.


Here it is directly installed on the block. It looks like it belongs there! Installing it directly on the block will eliminate any friction (thus wear & tear) on the oil lines due to engine vibration. The 3/8" braided stainless line I got at Summit Racing. It comes in 3 foot pieces. One 3 footer is enough. The fittings are standard 3/8" -6AN fittings. An easy way to cut this braided stainless line (which is rubber with a stainless braid on the outside), is to very tightly tape in the middle of where you want to cut it, so there is tape on both sides of the cut, then use a Makita grinder to cut it. Take the cutting slow and it will be very clean and easy to put the ends on.

Note: For some years of motors, the rocker assembly is fed by a tube under the side cover up through the head into the intermediate rocker support. Later head designs did away with requirement by adding a oil passage up through the head to feed that goofy tube on the rocker shaft. Make sure your head has this feature or you will get no oil to the rockers. An air compressor set to low pressure will help you chase the passages and convince yourself you will have sufficient flow to the rockers. DO NOT drill out the oil passage restriction in the head as it is designed to maintain pressure to the lower end of the engine.


Solution Five: Every now and then we see a Triangle Motor Mount on the side of the 235 Engine that has two holes at the top and one hole at the bottom. The front hole is 2-1/2" from the bottom hole and the rear hole is 2-5/8" from the bottom hole. Special THANKS to Michael for taking the time to send in a cardboard template so we can make the correct adapter plate. This type of motor mount has 3/8" coarse threads in the mounting boss so perfect for this application.

Parts List for 235/261

These two engines have slightly different parts lists, so I will differentiate between them where needed. Prices are as of 8-23-15.

  1. Trans-Dapt 1028 Spin-On Filter Adapter - Summit Racing - $19.97
  2. Wix 51515 Oil Filter - Summit Racing - $6.75
  3. 3 feet of 3/8" Stainless Braided Pressure Hose - Summit Racing SUM-230603 - $14.97
  4. (4) -6AN (3/8") Hose Fittings - Summit Racing SUM-220690B - $19.76 [Hose Fitting installation can be found here: Hose End Installation]
  5. (2) -6AN to 1/2" NPT Adapters (Trans-Dapt Ends)- Summit Racing SUM-220649B - $9.98
  6. (2) -6AN to 3/8" NPT Adapters - Summit Racing SUM-220648B - $4.98
  7. (2) 1/2" NPT to 3/8" NPT Female Stainless (engine block) - McMaster-Carr 4464K266 - $7.58 [261 Only]
  8. (1) 3/8" NPT to 3/8" NPT Female to Male Adapter Stainless (engine block OUT port) - McMaster-Carr 48805K42- $15.96 [235 Only]
  9. (1) 3/8" Tee Connector Stainless - McMaster-Carr 4464K49 - $8.83
  10. (1) 3/8" by 4 inch Pipe Nipple Stainless - McMaster-Carr 4830K156 - $4.32
  11. (1) 3/8" NPT to 1/8" NPT Female Stainless - McMaster-Carr 4464K262 - $3.00
  12. (1) 1/8" NPT Plug Stainless - McMaster-Carr 4464K231 - $1.84
  13. (1) Filter Adapter Mount [any style] - DevesTechnet.com - $35
  14. (3) 3/8" x 1/4" Hex Head Bolts Stainless - McMaster-Carr 93190A626 - $8.08
  15. (3) 3/8" Lock Washers Stainless - McMaster-Carr 92147A031 - $6.79
  16. (3) 1/4" x 1-1/4" x 20 Hex Head Bolts Stainless - McMaster-Carr 93190A544 - $4.80
  17. (9) 1/4" x 20 Nuts Stainless - McMaster-Carr 91845A029 - $4.64
  18. (3) 1/4" Lock Washers Stainless - McMaster-Carr 92146A029 - $4.10
  19. (3) 1/4" Flat Washers Stainless - McMaster-Carr 92141A029 - $3.37


Solution Five: For people with Fenton dual exhaust manifolds, this solution includes a very special adapter that moves the Spin-on Adapter further forward. This can't be used with a Generator so only folks with Alternators can use this. The plumbing gets very complicated so the kit is more expensive. The picture right shows about the best route for use of this adapter with dual exhaust. The kit comes with everything you need in stainless steel. While more expensive, it will never rust!

The routing to get the oil to and from the adapter is complicated and requires just the right fittings so as not to interfere with the steering gearbox. In the end, the pipes come out nicely to the point where the hoses take over. This eliminates heat problems from the hot exhaust. The thing that makes this heat issue so important is the stainless braided hoses are rated to 300 degrees and the exhaust system is considerably hotter. Start at the engine block with the fittings and use teflon tape or equivalent and tighten securely as you go.

Parts List for Fenton Exhaust

If you have modified your 235 for Full Flow or have a 261 with Full Flow, use 3/8" NPT and -6AN Parts instead of those listed here. These parts are listed in the order of placement per the photo. Remember, these parts are for a bypass filtration system using the Fenton Exhaust. Most of the Summit Racing parts for 3/8" are listed above, then go to McMaster-Carr and get the Stainless Pipe Fittings for 3/8" NPT for full flow.

    Front Oil Outlet 1/8" NPT:
  1. 1/2" NPT to 1/8" NPT Adapter to go into the Transdapt 1028 Spin On Filter Adapter. McMaster-Carr 4464K264 Need Two.
  2. 1 - 17 inch long stainless braided hose (6 feet at Summit Racing is $23.00 SUM-230406)
  3. Hose ends (-4AN for 1/8" NPT or -6AN for 3/8" NPT) Need 2. Summit Racing 220490B
  4. 6 inch pipe threaded on both ends - McMaster-Carr 4830K118
  5. 90 degree Elbow - McMaster-Carr 4464K11
  6. 4 inch pipe threaded on both ends - McMaster-Carr 4830K116
  7. Female-Female Coupler - McMaster-Carr 4464K351
  8. Adapter (-4AN male to 1/8" NPT male) or for full flow (-6AN to 3/8" NPT) Summit Racing 220446B
    Rear Oil Inlet 1/8" NPT:
  1. 1/2" NPT to 1/8" NPT Adapter to go into the Transdapt 1028 Spin On Filter Adapter.
  2. 1/16th reducer (See Yellow Box below)
  3. 17 inch long stainless braided hose (6 feet at Summit Racing is $23.00 SUM-230406)
  4. Hose ends (-4AN for 1/8" NPT or -6AN for 3/8" NPT) Need 2. Summit Racing 220490B
  5. 4 inch pipe threaded on both ends - McMaster-Carr 4830K116
  6. FFF Tee Connector - McMaster-Carr 4464K47
  7. 1/8" Pipe Plug - McMaster-Carr 4464K231
  8. 5 inch pipe threaded on both ends - McMaster-Carr 4830K117
  9. 90 degree elbow - McMaster-Carr 4464K11
  10. 4 inch pipe threaded on both ends - McMaster-Carr 4830K116
  11. Female-Female Coupler - McMaster-Carr 4464K351
  12. Adapter (-4AN male to 1/8" NPT male) or for full flow (-6AN to 3/8" NPT) Summit Racing 220446B


All About Full Flow Oil Filtration for your 1954-1962 235/261 Engine

Special thanks to Bruce Childs for a lot of the technical content in this article. To confirm for the machine shop, have them also go to Inliners.Org. Both of these instructions do the very same thing but explain it in a slightly different way. I am especially grateful for these articles because I recently had my machine shop do the machine work as described below. The cost was $100 and it was the best $100 I have spent in a long time. Here's why...

Machining your 1954-1962 235 and 1954-1958 261 Engine

The 261 in 1958 (1958-1962) came out with a unique dowel 'switch' that allowed the engine to be either bypass or full flow. You can read all about that and much more very good information about the 261 engine here: The Venerable 261. This was the first time GM gave us full flow oil filtering. The rest of us need to do the modification below.

Tools List:
9/16" Drill Bit
21/64" Drill Bit
3/8" NPT Tap
1/8" NPT Tap
3/16" Drill Bit (or close - only used for starting the hole)
Parts List:
Remote Oil Filter Adapter Kit (Instructions below)
1/8" Pipe Plug
Two 3/8" NPT fittings

This is how I have done the full-pressure oil filter on the 235/261. I don't suggest you do this unless the motor is completely apart for a rebuild. With the drilling and tapping, there will be too many metal chips to do this on a motor that is already built.

All of the drilling and tapping will be done on the oil pump side of the block.


Step One: Get a 1/8" NPT Tap. Now, go about 1.375 in the hole (being careful not to damage the threads for the pump fittings.) Tap and install 1/8" Pipe Plug. This will plug the passage to the mains. <--

Step Two: Put the block on its oil pan flange. The next hole you will drill from scratch, and it may be a little scary for the first-timer. Just take your time and look at the pictures. I tend to drill this hole a little on the high side so you don't get into the fitting for the oil pump.-->


Start with a 1/8" drill bit on a slight angle (see angle of tap below.) Go to a 3/16" then to a 9/16" drill.<--

Be careful and try to keep it lined up straight with the oil pump passage. Now tap the hole with a 3/8" NPT tap being careful to keep the same angle that you drilled on.-->


Step Three: The next hole that gets drilled is the hole that used to have the bypass filter and oil pressure gauge hooked to it. Take your time and just drill this one out to 9/16" Tap for 3/8" NPT also.

Step Four: The next hole is drilled about halfway between the last one you drilled and the flywheel end of the block. Get the hole centered on the passage.<--

Drill it with a 21/64" drill, then tap with a 1/8" NPT tap.-->


Step Five: You may choose not to drill this one if your filter has a place for a 1/8 NPT to plumb your gauge. I have done them both ways.<--

We use the Trans-Dapt remote filter in our shop, but others will work. There are other ways to do this, but I have found this one to look and work the best. Total time to do the job is about 1 hour (it took me longer to do this article!) Have fun and be safe! - Bruce Childs (aka Phat)


Another option for Bypass Filtration...

If you have a 216 or 235 engine with a bypass system, but want the benefit of a spin on oil filter, (still Bypass but easier to change the filter), you can do one of two things. A good choice is to get the WIX Model 27455 Spin On Adapter which mounts to the intake manifold just like the bypass filter did. The WIX 51050 Filter is used with that system. This 51050 Filter has a built in .0625 reduced orifice to keep the proper oil pressure. Really it's a good kit because you just purchase it and it will work just fine. It's only drawback is it is not compatible with the thread sizes of the more popular filters.


Check out our other Kits for your 216/235/261 Engine!

We are developing more fun stuff for your vehicle. The Kits that are available now are Regular and Deluxe PCV Upgrade Kits, Spin-on Oil Filter Adapter Kits for both Full Flow and Bypass, our popular HEI conversion kit, Stock Heater Switch solutions and much more! Check out all of our offerings at Farm-it-Out!

Oil Flow Picture Gallery