Sbc build for 9 c10 daily driver - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-25-2018, 05:52 AM
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Sbc build for 9 c10 daily driver

My 69 c10 has a wore out 350 in it and I would like to built a new motor for it. I drive 60 mile round trip to work everyday, so mpg is important.
I have a 4 t main block from the mid 70s to use.
I would like to try to use some of the parts off my current motor if it will work.
I have a set of rebuilt iron heads that are a year old, 2.02, 1.60. 65 c.c. chambers.
Eddy 600 cm carb and performer dual plane Intake.
Headers with 2.5 in dual exhaust
Comp cam extream energy 212-218 @ 50, 447-457lift.
I have a th 400 tranny, 3.08 rear gear with 31x10.50 rear tires
What do I need to do With a motor? Budget 1500 bucks.thanks

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Old 06-25-2018, 08:37 AM
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If you do a lot of stop-n-go driving, 3.08s are not your friend sometimes, especially with a big heavy tire.
Ideally, get a 700r4 for its 3.0 1st gear, and you just wont use the OD hardly ever.

The old-school iron heads are the wildcard. Depending on their casting number, they could be very good, or killing any hope of getting this to work.

If the cam you referenced is a USED flat-tappet from another engine? scrap it. You can't afford the risk, get a summit 1101 cam to get Ms Piggy up and moving.
If your block doesn't need to be decked (you'll have to check it for squareness and flatness), skip white has pistons that will reduce the amount that the piston sits in the bore at the top of its stroke. This is important to have good quench and efficiency.

Note: A lot of the Eddy 600cfm carbs Ive seen are the 'economy' jetted ones and they can be quite lean.

Last edited by AutoGear; 06-25-2018 at 08:46 AM.
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Old 06-25-2018, 04:56 PM
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I think the casting on my heads ate 434. They came of a 305 I believe.
Aero cylinder heads put the bigger valves in and screw in studs. The also opened up the intake and exhaust runners. The cam is in my current motor, it might have 3000 miles on it.
The first picture is from my cracked 882 head. The second from my 434 rebuilt head.
You can see how they opened it up a tad.
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Old 06-25-2018, 11:22 PM
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For your truck I would consider vortec or other fast burn heads and a shorter cam
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Old 06-26-2018, 04:57 AM
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Swapping used FT lifters from one block to another is a very bad plan. Re-using lifters and cam in the same block with only 3k on the set would be OK as long as the lifters go back into the same locations, but not in another block.

I'd strongly recommend saving your money for a retrofit roller setup - $600 from Howard's. Especially considering this is going to see alot of miles.

The head casting number is located on the top of the head between valve springs.

FWIW, Vinnie's recommendation of heads is a very good one, but if you already have the heads, then I'd say use them if they have a fresh, well done valve job.
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Old 06-26-2018, 06:37 AM
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It sounds like you already put some money into the old heads, which is unfortunate. I'm also concerned about your reference to 305 heads, since using 305 heads on a 350 is also a bad idea.

A swap to Vortec 350 heads would be much more effective for horsepower than trying to rework old heads to make them work better. If this is a long term vehicle, I would plan for a 64cc Vortec head swap

The cam you have is borderline for your heavy truck. Something with a little less duration should also help your gas mileage and help power off the line. I agree with the recommendation for using a retrofit roller cam, but I've done it recently myself and found there is quite a bit more cost than using a flat tappet cam. The Howards retrofit roller kits have good prices, but then you have to add on pushrods and rockers, and usually need a new reinforced timing cover to support the use of a cam button. You will also want to buy a new timing chain.

The 400 transmission sounds like a transplant for a C10, especially with 3.08 gears. Most 1/2 ton trucks would have had a TH350. 31" tires are fairly close to stock diameter, but you really need more gearing to get the truck going. 3.73's would probably be a good compromise, although 4.10's would still work fine if you keep your road trip cruise speed at about 65 mph.

Bruce
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