Big Block Chevy lower water drains?

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John_Heard
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Big Block Chevy lower water drains?

#1 Post by John_Heard » Tue Aug 13, 2013 7:25 am

Any one remember how deep the hole is on the lower block drains? the ones on each side of the block, they are like 1/4 Npt I think.

Trying to see if I can get one of these sensors in there before I order one? Yeah, I know I can drain the block and find out, was just being lazy...

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mytmouz
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Re: Big Block Chevy lower water drains?

#2 Post by mytmouz » Thu Aug 15, 2013 9:02 pm

I don't think so...
Trucks are for haulin...

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Re: Big Block Chevy lower water drains?

#3 Post by bracketracer » Wed Oct 16, 2013 7:42 pm

John How long is it :shock: .......I have a few BBC blocks in the garage I can check and see but I don't think it going to fit in there :scratch:

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Re: Big Block Chevy lower water drains?

#4 Post by John_Heard » Wed Oct 16, 2013 10:58 pm

It's on the low priority list, I haven't messed with it yet. I have a temp sensor for a autometer water temp gauge that I think I might be able to make work if it's 0-5vdc, haven't got a chance to research it yet.

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Re: Big Block Chevy lower water drains?

#5 Post by TubbedTruck67 » Mon Nov 04, 2013 7:42 am

How long is that probe john? Im putn a bbc together at the shop right now for a customer i can look and see if it would fit.

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Re: Big Block Chevy lower water drains?

#6 Post by John_Heard » Mon Nov 04, 2013 8:04 am

Not real sure haven't ordered one yet, looks to me like it's maybe 1/2" long. It's 1/8 NPT, so it'll stick out less then that when I put it in a reducer bushing. I think those side drains are 1/4npt

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This is an Autometer ATM-2252, it's actually a Delphi 12160855 part.

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Re: Big Block Chevy lower water drains?

#7 Post by TubbedTruck67 » Mon Nov 04, 2013 3:38 pm

If youve got to put a bushing in there too it should fit fine id think. This block i have here measured 1.625 from the outside of the block to bottomed out. It was 1/4npt not sure if tour aftermarket block would be the same or not though.

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Re: Big Block Chevy lower water drains?

#8 Post by John_Heard » Mon Nov 04, 2013 4:00 pm

Thanks for checking that Sam, sounds like there is plenty room for that sensor probably.

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Re: Big Block Chevy lower water drains?

#9 Post by John_Heard » Wed Dec 11, 2013 9:21 am

Just a follow up on this, the Dart block doesn't have much room in it for a sensor to go in at all. If that delphi sensor will fit It'll be close, looks like it will likely bottom out. I'll have to rig up something different or find another place for the sensor.

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Re: Big Block Chevy lower water drains?

#10 Post by Bruce69Camaro » Wed Dec 11, 2013 11:16 am

Hey John, stupid suggestion, could you tap a larger size hole and then use a hex bushing to adapt down to the sensor size and this might give you the extra depth you need?
Those who think they know it all have no way of finding out they don't......... :scratch:

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Re: Big Block Chevy lower water drains?

#11 Post by John_Heard » Wed Dec 11, 2013 11:32 am

I'm going to get the sensor first - it's 1/8" pipe, and the block is 1/4 pipe, so have to use a reducer which will help some. If that don't move it out enough I may have to make something else. No, don't want to drill on the block really if I can avoid it.

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Re: Big Block Chevy lower water drains?

#12 Post by Bruce69Camaro » Wed Dec 11, 2013 11:37 am

Ok, here's a suggestion, use a 1/4" close nipple, a 1/4" steel coupling which is about 1.125" long, then thread in your hex bushing reducer and you now have some extra depth.

If it's now located out too much, cut down the coupling.
Those who think they know it all have no way of finding out they don't......... :scratch:

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Re: Big Block Chevy lower water drains?

#13 Post by John_Heard » Wed Dec 11, 2013 11:56 am

Yeah I'm sure with some combination of fittings I can get something to work. I'm quite curious to see how block temp relates to ring seal.

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Re: Big Block Chevy lower water drains?

#14 Post by Bruce69Camaro » Wed Dec 11, 2013 12:04 pm

Are you sure you're not Bill Nye the science guy?

I'm just curious to see if I can break into the 11's... :smt005
Those who think they know it all have no way of finding out they don't......... :scratch:

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