Keep in mind that if you remove the valve covers, new gaskets may be needed. The valve covers must be removed to find the number. The head casting number is located on the top of the cylinder head. The engine wears the correct OB303458 serial number for AAR/TA 340 Six Pack production and has been sitting in a shed for an undetermined amount of time, evident by the prolific rust seen in the photos. The most important numbers in a casting number are the last 3 digits.įor FORD engines, the block casting number is usually underneath the engine which makes it impossible to read when the engine is still in the vehicule/boat. Sometimes the last three digits of the block casting number are cast into the block on the side. This ledge is located near the bellhousing. E4AE) and the metric model of the GM 4.3L (262 cid) which ends by 090M.įor CHEVY engines, the block casting number is usually located on a ledge found at the rear of the block and has 6 to 8 digits. You could try using a mirror if the casting number is located in an area that is hard to see or reach.īlock casting numbers do not have any letters in them with the exception of FORD engines (ex. These numbers are also hard to read when the engine is still in the vehicule/boat. Sometimes grease or grime could be covering them and you might have to clean a part of the block before you can be able to see them. Using the casting number ensures selection of the correct parts.īlock casting numbers are not always easy to find. These numbers are in the die cast mold and are part of each engine the mold produces. Engine casting numbers are identifying marks manufacturers create on the block or head of an engine.
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