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Oil bypass block off

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green70AMX View Drop Down
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    Posted: Oct/17/2020 at 7:37am
I am working on a 70 390 and have seen the oil filter bypass plug that is sold by Bulltear. Also read about using a filter adaptor that allows you to use a Motorcraft FL-1A oil filter. My question is if you do these changes is there anything else that needs to be done for using these items or can you just switch these out and use the FL-1A filter with the bypass blocked? Thanks in advance for any help Bob 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401jim Quote  Post ReplyReply Direct Link To This Post Posted: Oct/17/2020 at 8:56am
Matt sells a good block off item. I use NAPA 1258 filters with NO issues. If you are racing, then this brings up a whole new area to look at. I have never changed from AMC style filter on any of my builds. The Block off  from Matt will do the trick. Jim
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 68-73 amx Quote  Post ReplyReply Direct Link To This Post Posted: Oct/17/2020 at 11:27pm
The bypass plug and oil filter adapter is all you need.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jcisworthy Quote  Post ReplyReply Direct Link To This Post Posted: Oct/18/2020 at 2:11am
If you want to block it off, thread the filter adapter bypass hole with a 3/8 pipe tap and install a pipe plug. Make sure the pipe plug is far enough down so it does not interfere with the oil filter housing when the filter is installed. 

Then, screw in a later filter thread adapter which accepts an FL1A filter and run an FL1A filter. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 5spdwagon Quote  Post ReplyReply Direct Link To This Post Posted: Oct/18/2020 at 3:14am
Originally posted by jcisworthy jcisworthy wrote:

If you want to block it off, thread the filter adapter bypass hole with a 3/8 pipe tap and install a pipe plug. Make sure the pipe plug is far enough down so it does not interfere with the oil filter housing when the filter is installed. 

Then, screw in a later filter thread adapter which accepts an FL1A filter and run an FL1A filter. 
What’s the advantage of doing this?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote XJ6 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/18/2020 at 6:31am
I use the Crown filter adapter that has no bypass built in part number33003536 and the Mopar adapter 553007563AB to use the FL1HP filter


 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote green70AMX Quote  Post ReplyReply Direct Link To This Post Posted: Oct/18/2020 at 7:25am
Thanks for all the replies just wanted to make sure that was all i had to do.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hurst390 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/18/2020 at 8:44am
Originally posted by jcisworthy jcisworthy wrote:

If you want to block it off, thread the filter adapter bypass hole with a 3/8 pipe tap and install a pipe plug. Make sure the pipe plug is far enough down so it does not interfere with the oil filter housing when the filter is installed. 

Then, screw in a later filter thread adapter which accepts an FL1A filter and run an FL1A filter. 
I dont bother threading the adapter..I just grind a little of the threads off the plug and it fits tight. no mess and quick and effective

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: Oct/18/2020 at 8:59am
Originally posted by Hurst390 Hurst390 wrote:

Originally posted by jcisworthy jcisworthy wrote:

If you want to block it off, thread the filter adapter bypass hole with a 3/8 pipe tap and install a pipe plug. Make sure the pipe plug is far enough down so it does not interfere with the oil filter housing when the filter is installed. 

Then, screw in a later filter thread adapter which accepts an FL1A filter and run an FL1A filter. 
I dont bother threading the adapter..I just grind a little of the threads off the plug and it fits tight. no mess and quick and effective



Yep, that's similar to the old method of placing an object that fits the hole, to plug it. There is a lip in the hole to seat, and the adapter bypass plate is undersized, so what ever is used won't be dropped or pushed into the block. I had hand filed (no grinder at the time) a cut threaded section of a bolt to fit, back when I had my 1st AMC, in the 80's.

Though the Crown part would be easiest, if readily available.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JD Quote  Post ReplyReply Direct Link To This Post Posted: Oct/18/2020 at 10:47pm
Why use the Motocraft FL1A that has a built in bypass valve after going to the trouble of blocking the oil filter adapters bypass valve?? I thought the whole purpose of blocking the bypass is to prevent unfiltered oil from bypassing the filter.

Edited by JD - Oct/18/2020 at 10:50pm
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