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Old 01-10-2015, 10:21 AM
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Car: -88 TA GTA
Engine: 350 tpi
Transmission: TH700
plug thread
Can anyone tell me what thread this is?
Marked with X in the picture. Seems to be fine thread(UNF)
Ill have to order it from the US, since everything is metrical here....
Attached Thumbnails plug thread-topvc.jpg  
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Old 01-10-2015, 10:56 AM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: plug thread
1/8 npt
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Old 01-10-2015, 11:00 AM
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Car: -88 TA GTA
Engine: 350 tpi
Transmission: TH700
Re: plug thread
That would be 3,175mm. Its larger than that.
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Old 01-10-2015, 11:05 AM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: plug thread
5/16 is 7.9375mm
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Old 01-10-2015, 11:33 AM
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Car: -88 TA GTA
Engine: 350 tpi
Transmission: TH700
Re: plug thread
Hmmm Im checking this table
http://mdmetric.com/tech/thddat19.htm

I think u were right 1/8 npt
thanks
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Old 01-10-2015, 12:03 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: plug thread
Np, put Teflon tape or liquefied Teflon on the threads. There is a second 1/8 npt next to the pcv passage on the drivers side of the intake.
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Old 01-10-2015, 12:19 PM
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Car: -88 TA GTA
Engine: 350 tpi
Transmission: TH700
Re: plug thread
Got 2 pieces 1/8 npt on Ebay. Thanks for good info!
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