'86 C20/C10

[mizozuman2]

Hey Forum,

    I figured if I'm going to give you all heck with my questions on here, you should at least be able to see the Vehicle you're answering the questions for. Haha.



The truck is a White C20, but it's got a 350 without Catalytic converters which makes me question on if it's a Heavy Half or not (If you have some info on that, please let me know!). Currently, it has a blown head gasket, but it's being worked on (When it's not raining here in Kansas....)



This is after I got the new dash pad installed onto the dash. The left most corner of the dash is a bit of a pain, and I'm going to have to trim some of the back of the gauge bezel off to get it to fit right. The carpet and bench seat are now installed, but I do not have a picture of that on hand.

As of right now, all that's left majorly is to take care off is the rust on the driver rocker panel (Passenger side is just fine), That pesky dent in the door... the dent under the rear tail light on the drivers side, fix the head gasket, Install the new exhaust system and finish PlastiDipping the truck bed. The cab and the front clip were done when I got it, but the bed was peeling bad due to some spots that it was rubbed back. It was peeled off, and will be resprayed when there's permitting weather to do so. From my previous experiences, PlastiDip is a good alternative to paint if you don't have the money for it (Like Me). Though it isn't permanent, it'll last for around a year. I used it on a few ATV's, and had good luck with it.

Thanks for looking!

[bake74]

     Nice start.  Heavy half means it has upgraded springs, only federal trucks came without catalytic converters.

[blazing816]

From what I know (however Capt will know better) but they did not offer "Heavy Half Ton" in 86, they only did it in the late 70s to beat new emission regulations.

[zieg85]

It doesn't matter what the fender emblems say it is the VIN that counts.  What is the VIN?  You don't have to post the last 6 numbers and we can tell you exactly what it is (or at least what the VIN is)

[Captkaos]

A C20 is  3/4 ton, so it isn't a Heavy Half.
A Heavy half is a half ton C10 with 3/4 Ton rear leafs.

[blazing816]

A C20 is  3/4 ton, so it isn't a Heavy Half.
A Heavy half is a half ton C10 with 3/4 Ton rear leafs.

Wow I did not even catch that it was a C20.

[mizozuman2]

Okay, so since my truck is a C20 it won't have the catalytic Converters on it?

And also, what size are the bolts for the smog pump arms that Rea h through the headers and into the heads? I tried a 7/8, a 21mm and a 22mm. None of them seem to fit.

Thanks!

[bake74]

      Someone most likely removed the catalytic converter.
      See 1986 Service Manual in the tech section, section 6F-3 (page1079).

[zieg85]

      Someone most likely removed the catalytic converter.
      See 1986 Service Manual in the tech section, section 6F-3 (page1079).

I had a 1986 C20 parts truck that had no catalytic convertor but it was a stick shift with dual air pumps and factory dual exhaust on a 5.7L.  I have all the parts for my 86 C10 but I am going to put dual cats on it for my emission test

[bake74]

      Someone most likely removed the catalytic converter.
      See 1986 Service Manual in the tech section, section 6F-3 (page1079).

I had a 1986 C20 parts truck that had no catalytic convertor but it was a stick shift with dual air pumps and factory dual exhaust on a 5.7L.  I have all the parts for my 86 C10 but I am going to put dual cats on it for my emission test

     From what I have seen the federal registered trucks had no cat's, but if you look in the manual in the engine emission area, compared to the other ones, the federal registered trucks had more engine emission parts.

[zieg85]

Bake I hear you, there are 15 possibilities depending on the transmission, altitude and alternative just for the 5.7L, info gleaned from my Chilton's 80-87 repair manual
 

[mizozuman2]

I had a 1986 C20 parts truck that had no catalytic convertor but it was a stick shift with dual air pumps and factory dual exhaust on a 5.7L.  I have all the parts for my 86 C10 but I am going to put dual cats on it for my emission test
[/quote]

Mine's dual pumps as well. There's two of them on the passenger side. They've got their own belt and everything. But mine is an auto? Mine is also factory dual.

Also, if I do a custom exhaust on it given it doesn't have the cats from the factory,  do I have to put cats on there for some odd legal tern? Kansas doesn't do emissions checks.

Thanks. Have a Happy independence day everyone!

[zieg85]

No cats from the factory the exhaust shop will not require you to buy them.  You may need to bring along proving info like decoding your vin ahead of time and the fact your gas gauge doesn't have "unleaded fuel only".  Have that conversation ahead of time so there are no surprises.  Both my 85's still have the original dual exhaust system so I haven't had to go that route yet

[bake74]

No cats from the factory the exhaust shop will not require you to buy them.  You may need to bring along proving info like decoding your vin ahead of time and the fact your gas gauge doesn't have "unleaded fuel only".  Have that conversation ahead of time so there are no surprises.  Both my 85's still have the original dual exhaust system so I haven't had to go that route yet

     As stated, find out first and avoid the headaches or guesswork later.

[mizozuman2]

Will do when. I make it over to the truck today.

With these smog headers,  what size is the nut/bolt thing that tightens the A.I.R inlet to the header? I've tried a 7/8th a 21 and a 22. It's either too big, and wants to round off corners (which it didn't get to thankfully), or too small and won't go on.

I'll get more pictures of everything today as well.