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Old 11-17-2011, 09:30 PM   #26
68GMCCustom
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Re: drill and tap head for temp sender?

Just tap the head. The size the metric hole is vs a 1/8 NPT sensor (I think that's it?) is very little.
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Old 11-18-2011, 10:38 AM   #27
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Re: drill and tap head for temp sender?

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Originally Posted by 68GMCCustom View Post
Just tap the head. The size the metric hole is vs a 1/8 NPT sensor (I think that's it?) is very little.
The temp sensors in 67-72s are 1/2 inch NPT and is much bigger than the threaded metric hole in the LS heads
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Old 11-18-2011, 02:13 PM   #28
68GMCCustom
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Re: drill and tap head for temp sender?

oops....my mistake. I thought we were talking about an LS head and aftermarket sensor. my temp gauge is an autometer and not the OEM.

continue on!
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'68 GMC short step - '09 LY6 6.0L crate motor w/mods, '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy
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Old 11-20-2011, 12:05 AM   #29
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Re: drill and tap head for temp sender?

i didnt have any trouble getting it done with the engine in the truck. (A/C stuff is out right now tho). but i just drilled it out and used a ratcheting wrench to tap it. worked great.
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Old 11-20-2011, 10:55 AM   #30
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Re: drill and tap head for temp sender?

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will this work in the back of passenger head and show true temp on the original gauge cluster
http://www.summitracing.com/parts/VDO-323092/
Maybe I'm lazy but for use with a stock gauge, I'm not sure why you would'nt go with this. It's clean looking and easy.
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Old 11-27-2011, 07:39 AM   #31
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Re: drill and tap head for temp sender?

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Maybe I'm lazy but for use with a stock gauge, I'm not sure why you would'nt go with this. It's clean looking and easy.

did you drill and tap the head or turn down and tap sender -- I'm wanting to use my stock gauge on a 68.
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Old 11-27-2011, 08:01 PM   #32
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Re: drill and tap head for temp sender?

I purchased 323092 and bolted it on. Have not tested or used it yet though.
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Old 11-30-2011, 10:03 AM   #33
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Re: drill and tap head for temp sender?

I've drilled and tapped the head on 3 or 4 swaps, it isn't hard if you have the correct size drill bit for the tap, and yes, it's a BIG bit. I start with smaller bits and work my way up, putting grease on the bits and tap to catch the shavings. This is a factory '72 sensor in my current 5.3 swap.


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Old 11-30-2011, 03:34 PM   #34
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Re: drill and tap head for temp sender?

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I've drilled and tapped the head on 3 or 4 swaps, it isn't hard if you have the correct size drill bit for the tap, and yes, it's a BIG bit. I start with smaller bits and work my way up, putting grease on the bits and tap to catch the shavings. This is a factory '72 sensor in my current 5.3 swap.
Nice. It didn't look like there was much room between the hole and my exhaust manifold.

I think now that my engine is in I'll just tap the block plug. I just need to find a 23/32" bit.
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Old 11-30-2011, 03:38 PM   #35
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Re: drill and tap head for temp sender?

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I purchased 323092 and bolted it on. Have not tested or used it yet though.
You may want to contact the manufacturer and find out the Ohm range for that sender.
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Old 12-01-2011, 12:31 PM   #36
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Re: drill and tap head for temp sender?

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I machined a bunch of SB temp sensors down into a 12mm/1.5 thread so that means NO adapter and NO drilling and tapping the block! Talk about doing it right. If you want one PM me for details. !IF! thats OK with the board? I just need to know which sensor you want because there are like 5 diffrent connector types.
I really like what you did here. PM sent
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Old 12-01-2011, 12:58 PM   #37
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Re: drill and tap head for temp sender?

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You may want to contact the manufacturer and find out the Ohm range for that sender.
I did and the Ohms are way off - so it will not read right.
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Old 12-02-2011, 11:04 PM   #38
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Re: drill and tap head for temp sender?

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I did and the Ohms are way off - so it will not read right.
Thanks for doing the leg work.
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Old 12-04-2013, 10:48 AM   #39
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Re: drill and tap head for temp sender?

For the old school sbc some aftermarket intakes have 1/2" npt on the intake near waterneck.

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Old 12-04-2013, 10:56 AM   #40
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Re: drill and tap head for temp sender?

Many of the short waterpumps also have 1/2" npt port on top. I would think this spot would work as well. Haven't tried it so don't quote me on that one. I would think the one on the side of the wp would read the suction side of wp and wouldn't be accurate for engine temp., although it might be handy to know what the outlet temp of the radiator is.
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Old 12-04-2013, 10:58 AM   #41
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Re: drill and tap head for temp sender?

Yea, old thread I know. Just needed this type of info and thought I would add to it.
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Old 12-04-2013, 05:14 PM   #42
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Re: drill and tap head for temp sender?

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Originally Posted by Chevy4Life View Post
I'd be willing do donate my 67 temp 1/2" npt sender for the test. the sensor end is about 13mm so, some meat would probably need to be taken off all the way down. I have no idea how much "extra" material there is or how this would effect it's operation.

I could take some basic ohm readings before and after also.

I can't believe the gauge companies haven't jumped on this. I guess the $ is in selling us gauges not senders.

I think you will find there is not enough "meat" on the small 13mm end of the sensor, BUT you will find what you always want to know what is inside !!!
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Old 12-06-2013, 06:50 PM   #43
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Re: drill and tap head for temp sender?

Don't know if this will help for the original post which was about a 91 gauge cluster, if u get a sender from a 99 firebird it has 3 wire terminals, u can get a pigtail too, the plugs are realllllllyyyy easy to take apart, jus hook the two factory wires in the same spot then use the third for your temp gauge, no adaptors or machining required and the ohms are the same, I did that on mine and it matches the computer reasons exactly and we have measured it with a infered gauge and is right on, hope this helps. Also that sender will fit on either head.
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Old 12-06-2013, 06:52 PM   #44
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Re: drill and tap head for temp sender?

The sender has to be from a firebird, they were the only ones that had the 3 wire setup!
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Old 12-07-2013, 11:27 AM   #45
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Re: drill and tap head for temp sender?

I picked up an M12 x 1.5 die, and a 3/8 factory sender, put the sender probe section in my drill with a file in my vise, spun it until it was the size I needed. then hit it with the dye, worked out great. Pictures here http://carburetorssuck.com/index.php...ulletin&blog=8
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Old 12-07-2013, 11:29 AM   #46
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Re: drill and tap head for temp sender?

I have the three wire sender, so you are saying it matches the ohm range of the 81-91 square body temp gauge?
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