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Old 06-15-2002, 06:45 PM
Tom Tom is offline
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on the rear of the block there will be a casting number,something like 3970010 then there will be another cast number probably on the right side that will read something like this A 15 6 this is the cast date this one meaning jan 15 1976 or 66 the block cast number will tell decade.The first didget is for months and are alphabetical and GM did not use the letter I the second is for the day it was cast,third is the year,cylinder heads have the same code cast into them,and is located between the valves under the covers,on the heads there is also a secquence number so you can tell how close the heads were when cast(most hipo engines have consecutive secquence numbers,but not always)then there are the cast numbers in which the last 3 didgets usually are used to identify the head..ie: 261s,882s or186s.the numbers you took off the front engine pad says it was made in flint and the CRX could be anything
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