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Old 08-12-2006, 03:19 PM
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350 Chevy block casting question

Ran up on a 3970010 350 4 bolt main block..............has that casting number on one side, then next to it has a K 10, then nothing else on the block in that area....either side............no dates or anything like usual.......but, on the side of the block, between the oil pan rail and the coolant drain plug, is a clock looking thing, that I assume represents the date and time it was made.........anybody seen a block like this? ANy info on them? Are they ok for Hi perf use? Thanks, Brad

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Old 08-12-2006, 09:26 PM
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Im pretty sure thats a hi-performance capable block, Brad. You can look under the timing cover to see the codes under it to see how strong it is, since it denotes the nickel content also.
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Old 08-12-2006, 09:44 PM
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IF you are facing the front of the block, it has a 010 to the right side of the cam tunnel.maybe a little lower........Brad
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Old 08-12-2006, 10:45 PM
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Kewl, that means its a 1% nickel content, which is pretty good...that makes it much stronger.
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Old 08-13-2006, 02:08 PM
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The 010 block is very common and even in a 4 bolt too. Some builders actually prefer a 2 bolt block for build up as the 4 bolts tend to crack laterally in the lifter galley. For serious HP, most like the 2 bolt with a splayed 4 bolt kit installed.
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Old 08-13-2006, 03:31 PM
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Thanks.....It wasn't so much about it being 010 or 4 bolt main, but the clock thing on the side of the block I had never seen before..........We have about 50 or so 350 blocks at the shop and about 5 of them have that marking on it.........was just curious what these were about........Thanks again
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Old 08-13-2006, 04:02 PM
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my take on the clock thinger is to show the hour/shift it was casted..... the numbers right behind where distributor sits will be casting date you said it was ( k 1 0 ) correct? which denotes to (k= month 1=day 0= year) or november 1 of either 1970 or 1980.... now to know for sure the year one would want to check the numbers stamped into the block in front of the right cyl head.......
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Old 08-14-2006, 08:55 PM
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This came from another site and is genuine, however I don't remember who it was, but just wanted to help out those that asked the question and needed a correct answer.

Date Codes and Where Are They?

Almost every mechanical part made for a Chevrolet has a date code, either cast or stamped into it. These simply identify when the part was made. To the factory, this date probably made sure that they didn't leave any stock laying on the shelf too long, although if you have ever watched any factory production line run, it is doubtful if anyone ever reads the dates. The purpose of the date to Chevrolet was probably to ensure a means to track any defects should they arise. If a part dated March 3 and one dated March 21 were both defective, attention could be paid to those parts built between those dates for other possible defects. Today, these are used to determine if the part is correct for that Chevrolet , as an engine with a date code of D 16 5 (April 16, 1965) could not be correct for a '63 Chevrolet as the engine was made after the car was made. Parts too early are usually not correct either, as they would have been installed on an earlier vehicle, such as a B 23 3 (Feb. 23, 1963) in a '67 Corvette. NCRS provides a window of 6 months on date codes prior to the build date of the car. Obviously, a part on a car could not have been made AFTER the car was made._ But given how new items were constantly loaded on shelves, with existing items being shoved further back each time, a part could sit for many months before being assembled on a car. Usually, the parts were used within a few days or weeks but there are many documented original cars that have parts several months old. Be sure to notice that some parts have both a casting and a stamped date code. These can be several days apart. The stamped date code is when the part was assembled and should be the one considered.

Engine Block: The date code on a SBC is typically on the bellhousing flange behind the distributor. On early big blocks, it was on the passenger side near the pan rail, but later (1970) moved up to the same location as the SBC. Usually the date is given as a letter, a number and then a number, such as B 23 3 which is for February 23, 1963. With any engine still having ignition shielding on, you have a very hard time to see the date. A good flashlight and a wire brush to clean any dirt are a must, even with the shielding removed.

Cylinder Heads: The date code is located on top under the rocker arms. You must remove the valve covers to see them. Often lead deposits in old engines have filled the numbers and letters so they are hard to read. Often the rockers are in the way.

Intake Manifold: The small block usually has the date on the driver's side rear runner. The date is typically below the casting part number. The firing order (18436572) is usually cast on the front runner so do not confuse it with the part number. Some big block intakes have the date cast under the intake so that you must have the intake off the engine to see it.

Exhaust Manifolds: The casting numbers on the Ram horn manifolds are on the outside near the 1-3 or 6-8 cylinders. On the big block manifolds, it is found low near the outlet. The date codes on the Ram Horn manifolds are found on the opposite end. On the big block manifolds, the date code is found on the back side.

Transmission: The Borg Warner transmission has a date cast into the main body and tailshaft in the early T10s. Some later T10s ('70s) have it also. Usually it is found on the passenger side. The Muncie has a date cast on the tailshaft. Unfortunately, these casting dates are the ones that the castings were made, not the transmission. A stamped number usually contains an assembly date. Rear end housingThe housing for the 1963 to 1979 differential has a casting date on the drivers side. Again, this is the case date code. The assembly date is stamped in the bottom of the case on the lip where the cover mates.

Alternator: The date code is stamped into the housing.

Water Pump: The water pump has a date code cast into the body in the front but the pulley must be removed to see it usually.

Carburetor: Most of the earlier carburetors were built by Carter and had an identifier tag attached to a cover bolt. This tag had the part number and date code. On Holley carbs, the List Number is stamped on the drivers side air horn in front along with either a 3 digit or 4 digit date code. The Rochester QuadraJet has a stamped number on the driver's side on a vertical pad

Build sheets are a small strip of paper, about 2 inches wide by 8 inches long or a square about 5 inches by 7 inches that is usually buried in the cotton stuffing of the rear seat, in the backrest of the front seat, or drivers bucket. If you are lucky enough to find this, (the mice usually have other plans for it) then photocopy it immediately and put it back, the last thing you want is to lose it after having it right under your butt for so long. If you make a copy and replace it you are ensuring that the next guy (hey, we all know you plan on keeping this one forever!) can enjoy the thrill of "finding" this original documentation. Build sheets usually confirm what the Cowl tag will tell you, but in more depth.

Build sheets consist of the following information:
The model number, starts with 1 followed by 4 or more numbers.eg 12467.
A pair of letters will designate the paint code.
A three number series will designate the interior.
A series of one letter and two numbers indicates the factory installed_ options.

Last edited by locknkey; 08-14-2006 at 09:14 PM. Reason: corrected
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