cylinder head pipe thread size?
07-27-2007, 10:24 PM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
cylinder head pipe thread size?
Hey, what size is the pipe thread hole in the cylinder heads? This is for the temperature gauge on the drivers side.
I want to replace the plug on my passenger side with a thermal switch for electric fans, and I want to get the right fitting (before I remove the plug to measure it)
Thanks
I want to replace the plug on my passenger side with a thermal switch for electric fans, and I want to get the right fitting (before I remove the plug to measure it)
Thanks
07-27-2007, 11:34 PM
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Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
Re: cylinder head pipe thread size?
3/8" npt IIRC, there's only 3 choices typically, 1/4" ; 3/8" ; 1/2" all NPT threads from any hardware store.
07-27-2007, 11:41 PM
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: cylinder head pipe thread size?
Some heads are 1/2, some are 3/8.
07-28-2007, 12:23 AM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Re: cylinder head pipe thread size?
Yea, I knew it had to be 3/8" or 1/2" NPT. I was at Gregg distributor buying a thermal switch and the 1/2" looked too big, but I was unsure, so I didn't buy it. I don't want to have all my coolant in a bucket when I realize I bought the wrong one.
These are 416 305 heads.
Thermal switch - would I be able to nab one at the wreckers? Any thoughts on closed circuit temperature? I'm thinking 190°F or so, with my 180°F t-stat.
These are 416 305 heads.
Thermal switch - would I be able to nab one at the wreckers? Any thoughts on closed circuit temperature? I'm thinking 190°F or so, with my 180°F t-stat.
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