Coolant Sender Thread Size
Thread Starter
Junior Member
Joined: Feb 2003
Posts: 38
Likes: 0
From: Tampa,Florida
Car: 84 Z28 T-Top
Engine: L69
Transmission: 700R4
Axle/Gears: 3.73
Coolant Sender Thread Size
I didn't think I was this stupid! I'm trying to rehook my factory temperature gage in my 305. P.O. installed aftermarket gage with a nipple in the block. New coolant temp. sender doesn't thread into the nipple and is way too small for the block. Sender is correct (1 wire), and I know where it goes (between 1&3), what do I need to get? Could DRYSEAL or NPTF threads be the problem?
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iTrader: (29)
Joined: Sep 1999
Posts: 1,410
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From: Location, Location!
Car: 92 T/A 'vert
Engine: Mild .040 over L98 4 bolt mains
Transmission: Mostly stock 700R4, 2600 Vigilante
Axle/Gears: LS1 3.42
Re: Coolant Sender Thread Size
Maybe it was a cheap Chinese metric thread set up? A trip to Ace ought to set you up. No adaptor should be needed for a stock sending unit in a stock head. Are they aftermarket heads?
Joined: Jul 2006
Posts: 686
Likes: 2
From: Davisburg, MI
Car: 87 Evoluzione, 84 TransAm, 05 GTO
Engine: LT1, L98, LS2
Transmission: (2) T56 & (1) 700R4
Axle/Gears: Moser 12-bolt w/3.73 & Stock
Re: Coolant Sender Thread Size
Stock GM cylinder head holes (and senders) are 3/8" NPT. Aftermarket heads like Holley's can have 1/2" NPT.
Aftermarket senders can be 10mm or 12mm
Aftermarket senders can be 10mm or 12mm
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