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Mike F · 05-07-2007, 06:28 PM

The casting number was behind the right head and was in the mold when the block was cast. The other number in front of the left head is on the cylinder deck (ledge) right in front of the head and is a small number that was stamped on the block when the motor was put in the vehicle. It may or may not have one if they stoped doing it. It is where the saying "matching numbers" comes from with the old muscle cars and how you would know the motor was original to the car.

05-07-2007, 06:28 PM	#25
Mike F EFI AMC 360 Join Date: Mar 2007 Location: New Lebanon, OH Posts: 32	The casting number was behind the right head and was in the mold when the block was cast. The other number in front of the left head is on the cylinder deck (ledge) right in front of the head and is a small number that was stamped on the block when the motor was put in the vehicle. It may or may not have one if they stoped doing it. It is where the saying "matching numbers" comes from with the old muscle cars and how you would know the motor was original to the car. __________________ 89 YJ EFI AMC 360, T18a, D20, built D44, 14 bolt, 38" Creepy Crawlers.