67 ? K20

[Nickclimbs]

I recently bought a truck that has a 67 K20 cab but I don't know what the rest of it is? It was upgraded to a 3/4 ton dump body with heavy duty springs and a 4 speed transmission at some point but I do not know when so ordering parts seems a bit tricky not knowing what is really under the hood? The vin# on the door post says it is an 8 cldr but it has a straight six in it. 292? the number on the block is to the rear of the engine mount GMC 473483 Any help would be appreciated. thanks, Nick

[special-K]

I like that rig. What a handy unit. I always liked those single wheel contractor dump bodies. Why do you think the 4spd was swapped-in and not original. Most likely it came with a 4spd. For the engine ID you need to trace the engine number. But,to determine if it's a 292,are the motor mounts staggered front to back comparing side to side or do they sit at the same location fore/aft? 292s have staggered mount locations and either the crossmember would be swapped of some fabbing done when changing from a V8

[Nickclimbs]

There is a sticker on the inside of the glovebox door with a different vin# than the one on the door post. This vin # indicates it has a six. the vin number on the door post starts with KE indicateing 4x4 V Eight. neither of the vin numbers match the formulas that I found on the internet for determining all the specs for the year, GVW body style ,etc.

So this sticker on the glovebox door says " special equiptment added.
heavy duty springs, mirrors,4 speed transmission, 292 S eng Heavy duty radiator, heavy duty battery, locking hubbs.fuel filter. etc

The problem is that when I try to buy parts they do not show the 292 for 1967 so we look under 1969 and then the parts don't fit. Everything i have read says the 292 has a single bl carb and this looks like 2bl?

As you can see this is a farm work rig. I am not into shiny paint. I like things to look and feel old but I also want it to work. One of the clearance lights was broken and i did find a brand new Yankee 77 still in the box with perfect chrome on ebay. You won't catch me putting fancy chrome wheels on a rig though.

[Nickclimbs]

So this was sold to me as a 1968 3/4 ton. the key ring had an old service tag that says 1970 GMC but I think it is 1967 cab. Could the motor be a 1970?

[Shyguy]

Cool looking old truck.

Just by looking at the pictures you posted it looks like a K-20 because of the 8 lug wheels. The cab looks like it is a '68 or newer because of the large back window. It was rare for a '67 to have a large window.

What is the VIN on the driver's side door pillar and is the tag held on by rosette rivets?

The glove compartment doors are easy to replace and often are so the VIN on the glove compartment door is probably from another truck.

Many things need to be looked at to determine the year of the cab and engine.

Also a 292 has large, 4", covers on the passenger side of the upper engine.

[Nickclimbs]

the sticker on the glove box door says special equiptment added and it all seems to match what is on the truck where the info on the door post does not seem to match anything? the lenses on the turn signals are 67 and the grill looks like the one in the 1967 Chevy add. The vin on the doorpost is KE10D-PB17777 but it definatly is not an eight under the hood. Also the shift patern does not match the diagram on the celieng of the cab which tells me that it has a different tranny than what that cab came with.

[RenoKeene]

The front fenders are def 67 (no marker lights) and like Shyguy said...does the VIN tag have rosette rivits in it? Does the title match the VIN tag? There are also numbers stamped into the driver's side frame rail to the left of the engine.

[Nickclimbs]

Don't know what rosette rivets are? these look like normal rivets. No title. it's a farm truck.

[86C10LWB]

Im no expert, but the photo of that straight six sure looks like a late 70's early 80's motor. Does the intake manifold have bolts holding it to the head? If not its not the original motor.

[Nickclimbs]

drivers side of motor.

[Nickclimbs]

passengers side. the number on the block is.

473483
GM

[Katrina/10]

Engine is around 1979 250ci with integrated head.

[Nickclimbs]

The plugs are 5/8ths socket and not 13/16ths that the 292 called for? that was the first clue that the motor did not match the rest of the truck?

[Littletony]

Looks like a med 80s 250 to me.

[Nickclimbs]

What is an integrated head? the top of the distributer cap looks funny.

[Littletony]

The intake is made on to the head.

[Nickclimbs]

Looks like an intregated intake?

[Nickclimbs]

this is the weird looking distributer cap. hard to get a good look at it as it is hideing behind the plow pump.

[Littletony]

That is a HEI cap, why do you think it is weird?

[Littletony]

The next time you buy parts for the motor get parts for a 84 c10 with a 250. That set up you have is just like the one in my 84.

[Nickclimbs]

Distributer looks newer that 67-72 which is why I say it looks weird.

[Nickclimbs]

What is an HEI cap?

[Nickclimbs]

is it possible that I have a 1980ish 292? the motor mounts look staggered to me. anyone know where to check the numbers on the block to see what they mean?

[special-K]

I think 1979 was the last year for 292s in American-built trucks. HEI (High Energy Ignition) is the GM electronic ignition. That started in '75 in trucks. So,if the engine is all original and a 292 that gives a 5 year window...1975-1979. Where's reverse in your truck,down and towards you? That would be original through '69. My impulses say that is a '79 motor. I think your truck is an original '67,maybe,and the cab was switched. The glovebox door could be from the original truck. Do you have a title? Which VIN is on it? That sticker on the glovebox door is on all trucks. It's for parts I.D. and it shows the VIN,model#,and what options came on the truck with their RPO codes. Wait,does the model# read KS20905? If that's what it says,the glovebox door is from a very rare truck...a '67 3/4t 4wd Panel,judging by the original interior paint color. I see an Auxiliary Seat is listed. That wasn't an option in a pickup or cab & chassis. I need more details to pin this down.

[71swb4x4]

Here is what I am getting:
model number KS20905
K = 4x4
S = 5 cylinder
2 = 3/4 ton
09 = 54" - 59"
05 = Panel
According to the decoder on this site there should be a 7 after the 09 to indicate 1967. Very possible that wasn't part of the model number in 1967.

VIN
KS2562TXXXXXX
K = 4x4
S = 6 cylinder
2 = 3/4 ton
5 = panel
6 = ???? should be a 7 for 1967
T = built in Tarrytown
the last six are the production number

My guess, is that you have the frame for a 67 panel. It got really rusty, or they really wanted a dump truck, so they pulled the body, and put the other cab and dump bed on it. The front clip may be original. At one point the engine went, so they put the newer engine in it, sticking with a used 6 cylinder to keep it an easy swap.

Edit: I should add that a 67 3/4 ton 4x4 panel is extremely rare, and therefore valuable. The problem you will have, is that you don't have the original VIN tag, nor the body. But, the frame and glovebox door as still pretty valuable.

Can you find the VIN on the frame? That would really help decode this whole story.