![]() 45”) small block with a cannister oil filter and the crankcase ventilation hole in the back by the distributor. I also read somewhere it may have been a marine block at some point. 50 valves in the heads and marine 4 barrel intake. Resort near Palm Springs +Drinks 1,000+ bought Great Wolf Lodge Anaheim (10,190) Garden Grove, CA $308 From. Use the link and read more about it, and/ or email them for a definitive answer.Gm block number 384 9852. Sometimes the stamping is found above the timing cover mating surface on the front of the block. was stamped into a different area of the block on the flange edge of the rear of the block, near the bellhousing mating surface. In that case you might see "T0422TR 1123456789" stamped into the pad on the front passenger side of the block. In later years, parts of the Vehicle Identification Number (V.I.N.) were also added before or after the Engine Assembly Date/Suffix code. Chevy used one to three letters of the alphabet to code the type of engine, transmission and vehicle into the suffix code. What we have left is the "suffix code" which in this example is "TR". So what do we have so far in this example? The motor was assembled at the Tonawanda factory on April 22nd. The "22" stands for the 22nd day of the month. The next two digits stand for the month of the year, in this example "04" or the fourth month April. Your's might have an "F" or "V" for Flint, MI. In this case the first letter "T" stands for an engine factory Tonawanda. On later model engines the engine assembly code looks similar to this "T0422TR". If you need help decoding the suffix codes, just email us. Deciphering VIN numbers, trim tags and original factory documentation can also help. You need to look at ALL of the casting identifiers before making your determination. Relying solely on the suffix code to identify the original use of the block can be misleading. You would need to look at the block casting date to know which year the block was made to narrow down the possibilities. "CMR" was again used in '78 with a Corvette and a different engine/transmission combination. ![]() For example, in 1974 the suffix code "CMR" was used on three different vehicle models with the same engine and transmission combinations. Some of the Engine Suffix letter code combinations were used a number of times. ![]()
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