are the air rail threaded fittings on a 1971 California F engine cylinder head the same thread pitch and diameter as a 2F 1/75-9/87 cylinder head ? (1 Viewer)

[ToyotaMatt]

are the air rail threaded fittings on a 1971 California F engine cylinder

head the same thread pitch and diameter as a

2F 1/75-9/87 cylinder head ?



thanks for any tech here



thanks
matt

 

[ToyotaMatt]

 

[ToyotaMatt]

 

[RodrigzCrzr]

I would like to know myself! I. hope someone chimes in.

 

[ERNRAM]

Matt,

I have a confirmed 12/67 build 1F engine that has the California smog head. I put the desmog Man e Fre brass plugs in it and they screw in perfect.

They are not as nice as your NOS plug kit you have on your site.

If you want to triple confirm your plugs for early 1F, you can send me a single plug on my next order and I'll report back here.

Thanks
Ernie

 

[ToyotaMatt]

Matt,

I have a confirmed 12/67 build 1F engine that has the California smog head. I put the desmog Man e Fre brass plugs in it and they screw in perfect.

They are not as nice as your NOS plug kit you have on your site.

If you want to triple confirm your plugs for early 1F, you can send me a single plug on my next order and I'll report back here.

Thanks
Ernie

Thanks Ernie

your the best brother !

 

[Downey]

FWIW, For a zillion years we merely supplied 1/4" NPT plugs with our Holley conversion kits.

 

[ToyotaMatt]

FWIW, For a zillion years we merely supplied 1/4" NPT plugs with our Holley conversion kits.

good evening mr. downey , how are you sir


1/4 NPT pipe plugs are Neither JIS Thread pitch or diameter , and DO NOT have the necessary milled compression seat face the NON-USA ones in japan have ,....

how did this simply get by for so long ?

 

[Downey]

^^^^Evidently because it worked, so must not necessarily require the exact correct plugs. We found that NPT fit many Landcruiser applications (i.e. temp sender, have been using 1/2"NPT for years).

 

[ToyotaMatt]

^^^^Evidently because it worked, so must not necessarily require the exact correct plugs. We found that NPT fit many Landcruiser applications (i.e. temp sender, have been using 1/2"NPT for years).

thanks for your valued input as always Mr. Downey

kindly matt