71 C20 exhaust questions

[RHGuyettejr]

I have a 1971 C20 4x4 truck, however most parts stores list only 2wd C series trucks, and list the 4wd trucks as K series. To my knowledge during this time frame the K denoted blazer or suburban body style and C truck, however I will stop rambling on. I have long tube headers on the truck and was wondering if this kit will work for the rest of the exhaust. It is regular cab 8ft bed, I am not worried about having to lengthen the intermediate pipes, but if the x-pipe will clear the drive shaft. Also the truck is a 4spd manual, not sure if that matters. Here is a link to the kit.http://www.jegs.com/i/Dynomax/289/89027/10002/-1 Didn't know if anybody had experience with this or what I would have to do to modify the x-pipe. I am starting to think true duals would be easier, but I can't find a kit for that, although I could piece it together I guess.

thanks in advance.

Jr

[NEUMANNZZ]

is the tcase in the way? can you weld and bend tubes?

[RHGuyettejr]

is the tcase in the way? can you weld and bend tubes?

I don't own a welder, or know how to weld that well, and I do not own a pipe bender, but probably could get my hands on one. I just don't know if the X-pipe will clear. If I can buy tail pipes and header flanges I could always run true duals and then clamp the system together to get it to my friend who can weld it.

[NEUMANNZZ]

x-pipe? might be easier to install an h pipe, or go two to one.

[Boy&hisDogs]

K means 4wd and C means 2wd. the number after it denotated the weight class. 5 was a blazer, 10 half ton, 20 was 3/4 toon and 30 was 1ton. If it was a suburban, you would just say k10 suburban or something like that.

You might just try one of those hot rodder exhaust kits that just comes with a bunch of bend pieces and pipes and set it up yourself with clamps till you could get it welded. This link is to the cherry bomb kit, but I'm sure there are others if you don't like it.
http://www.cherrybomb.com/Catalog/Categories/accessories_hardware_hot_rod_builder_kits.aspx

[RHGuyettejr]

Thanks for the link, but my truck is a 4x4 C20, it apparently was a rare option but in the 70s the C stood for pickup body and the K for blazer suburban and the G for van bodies, and then of course the weight class as above, however most people just refer to it as a k20 which is fine, and that is how I have to order parts for as well because all the part stores have no 4x4 option for the c series trucks, it can be frustrating at times.

Anyway thanks again for the links.

[Quyonmob]

Thanks for the link, but my truck is a 4x4 C20, it apparently was a rare option but in the 70s the C stood for pickup body and the K for blazer suburban and the G for van bodies, and then of course the weight class as above, however most people just refer to it as a k20 which is fine, and that is how I have to order parts for as well because all the part stores have no 4x4 option for the c series trucks, it can be frustrating at times.

Anyway thanks again for the links.

I've never heard the C/K designation used like this before, they stemmed from the model designation in the glovebox, which is K=4x4 C=2wd. Even at that both the VIN and model use C and K to distinguish 2wd vs 4wd.

For 67-72 Trucks
model number breakdown.The model numder is made up of 2 letter and 5 numbers and is found in the glove box door
frist letter will be one of the followingindacates chassis type)
C=conventional cab
G=light delivery
K=conventional cab four wheel drive
M=conventional cab tandem
P=Forward controls
S=school bus chassis
T=Tilt cab
Second letter is one of the following(engine type)
D=4cyl detroit diesel
E=V-8 Gasoline
G=toro-flow diesel
S=6cyl Gasoline
T=3cyl detroit diesel
First number (series Indentification)
1=100-150-9100(1/2 tons)
2=200-250-9200(3/4 tons)
3=300-350-9300(1 tons)
4=400-450-9400(3 tons)
5=500-550-9500(5 tons)
6=600-650-9600(tandems)
next 2 numbers(cab to axle dementions)
chev gmcs inches Chev Gmc Inches
06 56 36" 17 67 102"
07 57 42" 18 68 108"
08 58 48" 19 69 114"
09 59 54" 20 70 120"
10 60 60" 21 71 126"
11 61 66" 22 72 132"
12 62 72" 23 73 138"
13 63 78" 25 75 150"
14 64 84" 28 78 168"
15 65 90" 31 81 186"
16 66 96"
last two numbers (Body type)
02=ffc exc f.a.b 35=step van king
03=cab and chassis 36=suburban/deluxe
04=stepside pick-up 42=chassis only
05=panel 45=step van
06=suburban with panel rear doors 55=step van king aluminum
12=w/s cowl exc F.a.b 62=ffc w/f.a.b
13=Cab W/F.a.b
14=Blazer/jimmy
16=suburban with end gate
26=suburban/custom
32=motorhome
34=fleetside pick-up

1967-1969 Vin break down (chev and gmcs)
series 10-30 only
first letter is the chassis type(see codes for model break down)
second letter is the engine type(see codes for model break down)
third is a number=gvw range (see codes for series id in model code break down)
fourth is a number=model code
model codes are;2=chassis/cowl/bus,3=chassis cab,4=pick-up,5=panel,6=carryall(suburban)9=stake side
fifth is a number =model year
if the number is a;
7=1967
8=1968
9=1969
sixth is a number or on caniadan made truck it is a number=assembly plant
Assembly plant codes
A=atlanta N=norwood
B=baltimore P=pontiac
F=flint S=st.louis
z=fremont T=tarrytown
J=janesville 1=oshawa
***on 67-69 Canadian GMC trucks the number"9" will appear inbetween the first two letters
1970-71 chevrolet truck only(series 10-30)

it is all the same for the break down but the year codes , production plant
1970-71 year codes production plant code
0=1970 same as 67-69 but they added one more
1=1971 code;U=lordstown
1970-1971 GMC only(1500-3500 series only)
first letter will be one of these
C=conventional cab
K=four wheel drive
P=forward controls
second letter
E=V-8 gasoline
S=in line 6 cyl gasoline
third is a number=GVW range(see codes for for series id in model code break down)
fourth and fifth numbers = body type
02=flat back cowl 35=value van-steel
03=cab&chassis 42=chassis only
04=fenderside pick-up 55=value van -aluminum
05=panel
06=suburban with panel doors
14=Jimmy/blazer
16=suburban with tailgate
34=fleet side pick-up

sixth is a letter(unless canadian built then it will be a 1)=assembly plant
all codes are the same as 67-69 but they added U=lordstown
seventh number or letter is the year code
Z=1970
1=1971
last numbers=serial number


1972 chev and gmc trucks
****General motors added one more letter to these trucks vin numbers****
first letter is the trucks make code
C=chevrolet and T=GMC
second is letter is the vehicle type(See 1971 codes)
third letter =engine type (see model code break down for codes)
fourth is a number= body type
2=chassis,cowl,bus 5=panel
3=cab&chassis 6=carryall(suburbans)
4=Pick-up
fifth is the number 2 for the year code(1972)
sixth is a number or a letter on canadian made trucks for the assembly plant code
A=Atlanta N=norwood
B=baltimore P=pontiac
F=flint S=st louis
Z=fremont T=tarrytown
J=janesville 1=oshawa

source: http://67-72chevytrucks.com/vboard/showthread.php?t=160357

[RHGuyettejr]

Thanks for this info. The cine starts with cke so it is a k series then? I just have never seen these body style trucks badged as a k20 only as c20. I got this information from an older guy so it is entirely possible it is all wrong.

[Quyonmob]

Thanks for this info. The cine starts with cke so it is a k series then? I just have never seen these body style trucks badged as a k20 only as c20. I got this information from an older guy so it is entirely possible it is all wrong.

I got the information from the internet, so it is also entirely possible it is all wrong. :D