Identify engine

[bigtruckboi2000]

I have a 65 C10 SWB that has a small block 350 but I have no idea of what year it is or what it came out of or from. how can I find out. I'm trying to get an MSD distributor and iginition do a basic tune up on it but don't know what to get. Also will a GM th-700 go straight in, to replace the turbo 350 that's still in it?

[bama63]

look here http://www.thedirtforum.com/castings.htm you will find the casting numbers at the drivers side rear of the engine just below where the head bolts down and the trans bolts up

[bigtruckboi2000]

Thanks bama63. I'll check it and post what I find.

[bama63]

no problem big

[bigtruckboi2000]

3970010 is what I found. Now that I have that info, and checked it with the site bama sent me, does it matter what year(yrs 68-79) I use for parts, like Ignitions, spark plugs, etc.

[cableguy0]

You have the average run of the mill 350. Basically anything will fit. You have a 2pc rear main seal and dipstick on the drivers side. It takes the standard heads and intake.

[bigtruckboi2000]

So basically my options are unlimited? As of now it has a edelbrock intake mani, and headers, but uses more gas than my 6 litre Denali and I'm trying to change that a lil bit. What would be the best way(s) to do that?

[1Bad62Pro/Street]

There is a thread on the casting numbers as well that may help.
http://67-72chevytrucks.com/vboard/s...d.php?t=382583
Posted via Mobile Device

[cableguy0]

Yup basically unlimited options. Theres a lot more to gas mileage than just the engine. Its the entire driveline combo. What transmission do you have? What rear gears do you have? What are the specs of the rest of your engine combo? I assume stock heads and block.. Do you know if the cam is stock? What carburetor do you have? What kind of ignition system?

[bigtruckboi2000]

Cableguy, the tranny is a stock turbo350, rear gears are stock(65 half ton), aftermarket headers(don't know what kind), edelbrock manifold(don't know what kind), edelbrock 2 barrel carb(don't know), and stock iginition. The truck was given to me by my uncle and he doesn't know anymore about it than what I know, which isn't much.

[cableguy0]

The 2 barrel carb is a large part of your problem. 4 barrel carbs run around on the much smaller primaries in most cases allowing for better fuel economy. @ barrels have only primaries so they have to be large enough to feed the engine at all rpms. I would look into a 4 barrel intake a 600cfm carb as the first upgrade. I would also be very curious about what the rear gear ratio is. A lot of these older trucks had a low gear in them. Stock ignition is another unknown. Stock for that truck would be point ignition. The cheapest best upgrade would be to an hei distributor and do a full tune up in the new process. New plugs wires etc.

[bigtruckboi2000]

I checked the carb and it has 1406 stamped on the front left side(as u look at it), so it's a four barrel. So the next work I do to it will be a tune up and replace the ac delco distributor cap with an HEI. Would an MSD ignition help any or would I just be wasting money?

[cableguy0]

A stock hei will be fine. Any pictures of what your working with? It will help steer you in the right direction. Do you have a tach? Do you know how many rpms your turning at 60mph?

[bigtruckboi2000]

NO tach cableguy, but that's on the list of to do also. Any suggestions? Working on pics of.

[GASoline71]

You can't just throw an HEI distributor cap on a points distributor. They are a completely different animal. The HEI has the coil in the cap, where the old points distributors have an external coil. You'll need different plug wires too, as the terminals for the HEI and points type are different. There are a lot of decent aftermarket HEI distributors on the market. You don't need to worry about an MSD ignition (like the 6A box). A good HEI will be mmore than enough.

Gary

[bigtruckboi2000]

Here are pics of what I'm working wit.

[cableguy0]

You already have an hei. I would pull that carburetor and clean/rebuild it. Remove the cap and see if there is buildup or carbon tracking. Also check the rotor for carbon tracking. Pull a plug and check. A full tune up probably wouldnt be a bad idea.

[taank]

Ditch it and get a Holley carb.
Posted via Mobile Device

[bigtruckboi2000]

@ Taank- I should be good with the Edelbrock after a lil adjustment(for now).
@cableguy- it probably is due for a tune up. Last time it was done was 3 yrs ago and I guess that's when the HEi was put on. But it's only had 3K put on it since then. how do I go about putting a tach on it? Also, in a couple of weeks I'm getting every strand of wire replaced in it, does $600 sound reasonable or too good to be true?

[cableguy0]

A decent harness costs like 400 bucks by itself. Theres a lot of hours involved in properly wiring a vehicle front to back. Granted the amount of electronics is fairly limited in your old truck but 600 sounds a bit cheap especially if your paying someone to do it. If you get a decent harness its not a terrible job to do yourself. I like the american autowire stuff myself. Your original harness is very limited on circuits so an upgrade definately wouldnt hurt. The tach is a very simple upgrade. You run a single wire out to the distributor and hook it to the terminal marked tach which is right next to where the power wire hooks up. Run a power wire for the tach itself. They usually come with decent instructions.

[bigtruckboi2000]

The guy said it would be an upgraded harness with extra circuits to hook up more stuff. He was the owner of R.A.D.'S here in Beaufort,SC. Who makes decent tach's?

[cableguy0]

You can geat a cheapie sun pro tach and be fine. You would be good to go for less than 50 bucks.

[bigtruckboi2000]

Going to pick up the tach and put it in tomorrow. I decided on the 3 3/8Sunpro Super Tach II blk face chrome bezel. Can't wait.

[bigtruckboi2000]

Put the Tach on today and tested it(so called). here's some of what I got:
Cruisin-50mph @ 2200, 60mph @ 2300-2400, 70mph @ 2500, 75mph @ 2600
Neighborhood accel- 1st-2nd @ 1800
Highway accel- 1st-2nd @2000; 2nd-3rd @ 2100
Burnout accel-1st-2nd @ 3000; 2nd-3rd @ 2300
Can't say I really knew what I was doing other than playing with the truck and watching the tach. But does those numbers look about right to anybody?
Pic of truck being revved after tach hooked-up.

[cableguy0]

If your only turning 2600 rpm at 75mph a 700r4 is not going to help you gain mileage. I would start with a full tune up. Make sure the plugs are gapped correctly at .045 and that you have the right plugs. I would make sure the timing is set right and get an ignition curve kit to set the timing curve properly and get the most out of what you got.