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can anyone tell me what size the bolts are that plug the air rail was on 1.8 i thought they where 14 / 1.50 but they are leaking

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92 gmc on 35/12.50/15
81 luv on 31/10.50/15

the are 14mm x 1.25 mm this is actually the same thread as metric spark plugs. You can also find a ford drainplug for this size thread. You can also leave the rail intact to plug it it has a one what valve to keep the exhaust from Blowing backwards and just cap the one house inlet.
some other people cut the tup and pinch it over. others have cut the tubs and tap the tube and thread a bolt in.

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Did a v8 conversion in 1981 on my '76 luv
Current Fleet
#1 1980 Black 2wd, #2 1980 Blue 2wd, #3 1980 Black 4x4 #4 1980 black 2wd Long bed #5 1979 black 4x4 #6 1977 red 2WD
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That all I did was taped off The check valve with electrical tape. If you don't cap it it will siphon air in it making noise.

that must be a rare size no one down here has it itryed oil pluges head is to big i guess i can grid them off

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92 gmc on 35/12.50/15
81 luv on 31/10.50/15

The easiest and cheapest fix is to cut the tubes and use a tap to thread the center of the fittings that go into the head, then put an allen bolt in each one of them, sealing each of them with a copper or brass washer to keep them from ever leaking.

It takes about a 1/2 hour to do them all and is actually hardly noticable.

I'm going to do that straightaway when I get pass vehicle inspection. The method Tazman described is a very neat one. I look forward to doing it. I want to do it right now, but I've been advised to leave all the emission devices intact until it passes inspection. I would venture to say if I looked for the plugs, I would find them rather easily, as there are several good places that would carry them. I'll be posting that info when I get to that stage. I just bought a new tap and die set yesterday, too. It was a cheap one, but it might work. ($9.99)

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'78 1.8L 4-speed Fleetside

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