The Ford Barn - View Single Post - Q:Connecting free flow oil Filter to 59 AB Flathead

69a · 05-19-2025, 03:27 PM

Read post #3 very carefully. You need to be 100% sure which type of filtering system your block is "plumbed" for. Failure to do that can result in destroying the engine.
1. You need to see if there is an internal plug in the horizontal oil gallery. 90% full flow if it is plugged. This system has both hoses fitted at the block.
2. You need to know if your actual filter is capable of providing sufficient flow.
3. If the oil gallery is not plugged, you are using the "bypass" system, and you must use a 0.060" restrictor between the block and the "IN" side of your filter.

05-19-2025, 03:27 PM	#7
69a Senior Member Join Date: Aug 2020 Posts: 262	Re: Q:Connecting free flow oil Filter to 59 AB Flathead Read post #3 very carefully. You need to be 100% sure which type of filtering system your block is "plumbed" for. Failure to do that can result in destroying the engine. 1. You need to see if there is an internal plug in the horizontal oil gallery. 90% full flow if it is plugged. This system has both hoses fitted at the block. 2. You need to know if your actual filter is capable of providing sufficient flow. 3. If the oil gallery is not plugged, you are using the "bypass" system, and you must use a 0.060" restrictor between the block and the "IN" side of your filter.