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Ok, the block is a circa-1974 "959" replacement 454. Above the oil filter, there are TWO oil plugs. One large, one smaller. The larger one is toward the REAR of the motor / the smaller one is just forward of that one. This is the first BB I have put together in awhile. All of the older ones were early blocks with only one outlet in that area.

So, my question is, WHICH one is best to use for the oil pressure sender?? I would assume these are for oil-cooler and one must be inlet? I would be looking for which one is the OUTLET. I have been searching, but haven't found specific ID's for these plugs.

Thanks.
 

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Sender Outlet

If you look at the oil filter from the side of the block, there is a 3/8" F.P.T. tapped hole centered above the filter. Thats where my oil pressure is measured from. Not positive but I believe that the blocks that came with a factory oil cooler or remote filter provision had two holes that were tapped for 1/2" F.P.T. I hope this helps you.

Chris
 

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If you look at the oil filter from the side of the block, there is a 3/8" F.P.T. tapped hole centered above the filter. Thats where my oil pressure is measured from. Not positive but I believe that the blocks that came with a factory oil cooler or remote filter provision had two holes that were tapped for 1/2" F.P.T. I hope this helps you.

Chris
I'll throw up a pic later, but one is bigger than the other. I seem to recall the one straight above the middle of the filter area is the one - like you said. Just need to get fittings to put the sender setup together and need to know when one to seal up.

Thanks for the help.
 

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pull 1 of the plugs out with the oil filter off, put alil air pressure to it and which every 1 shoots air outta the filter mount is the 1 to use.
 

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One of them is a threaded hole for a clutch linkage ball. It doesnt go into an oil passage.
 

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One of them is a threaded hole for a clutch linkage ball. It doesnt go into an oil passage.
No, not that one.

Here's a pic. I am certain it's the larger of the two. The one most centered above the filter boss. Just want to verify:

 

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One of them is a threaded hole for a clutch linkage ball. It doesnt go into an oil passage.
No. Corvette and some truck and motor home blocks had a oil cooler passage built in as Beer 30 discribes. The clutch pivot is closer to the bell housing than the oil port. Its is also the only known dead sure external way to know if it is a 4bolt. No 2 bolts where built with that arrangement.

Beer 30, the port that is almost dead center to the oil filter is the one you hook to. The one towards the front of the block was the return from the oil cooler. You can't use these ports for an oil cooler unless you have the diverting valve that went into the larger center port. Other wise the oil doesn't circulate thru the cooler.



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Oh well it was worth a try. I shouldnt be as direct with my posts.

I've had folks try and read pressure from the clutch ball mount before.
 

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hil:)hil:) Better yet, a friend tried to use the oil port as a clutch pivot in a street rod 10-15 years ago. He knew it was the oil port, but it lined up better and he thought he could use it. It dripped oil from the day he built it.
Very few blocks have the multi port castings and i beieve it was only for a few years. but if you ever see one, it is in fact a 4 bolt. Of the 6 blocks I have in inventory, only one has the multi port layout, and it is from a LS6 Vette. The other thing you will always see on these blocks is the scalloped bores for the intake valves.



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hil:)hil:) Better yet, a friend tried to use the oil port as a clutch pivot in a street rod 10-15 years ago. Very few blocks have the multi port castings and i beieve it was only for a few years. but if you ever see one, it is in fact a 4 bolt. Of the 6 blocks I have in inventory, only one has the multi port layout, and it is from a LS6 Vette. The other thing you will always see on these blocks is the scalloped bores for the intake valves.
Thanks to all.

No, cooler won't be used, so I'll plug the SMALLER, more FORWARD hole and get fittings/reducers for the rearward larger hole.

This IS a 4-bolt block. It is now .060 over and has a .010/.010 "7115" L-88/ZL-1 crank inside and full-roller Comp valvetrain. Gonna be a dual-quad EFI street motor with a 4L80E behind it.

Thanks again guys.
 
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