55, the displacement is cast into the top of the bellhousing flange at the back of the block. 55s, the serial number is stamped on the block between the first two spark plugs and the exhaust manifold on the driver side. 50s, the serial number is stamped on the front of the block below the driver- side cylinder head. VIN if the engine is original to the car. The first digit is a 3, signifying the Oldsmobile division, followed by a single digit for the year, e. A nine- digit engine ID code is stamped on a pad directly below the Number One cylinder. The casting number on Olds engines is located at the front of the block on top of the timing gear housing. Small- block heads are marked with a number cast into the lower left corner of the head over the exhaust port big- block heads, like this one on a 4. A quick way to differentiate between small- block (3. You can easily spot one by its scalloped valve covers. 18 shares the same displacement as its later and more popular kin (but not much else), and it’s probably best avoided. The code is a series of numbers that indicate production location and date, as well as displacement. This page was created with the marriage of three different pages so that everyone could use it for the furtherment of knowledge and use, happy MoParin'! Externally, small- block Chryslers all basically look the same, but they’re easy to identify because the factory stamped them with an ID code on the front of the block just below the cylinder head on the driver side.īy the way, the staff record for junkyard engine pulls is five in one month. A letter E stamped after the displacement indicates the engine has a cast crank. Both ID pads include a stamped single- letter date code (starting with the letter A for 1.ī for 1. The ID pad on RB engines is located at the front of the engine above the water pump housing (B) and may be obscured if an AC compressor is mounted. On B engines, the pad, which is stamped with the engine displacement, is located on the passenger side of the block just below the distributor (A). On the underside of the head on an intake runner.įrom ’6. RB/B, LA Cylinder Head Casting Numbers: The casting numbers for most RB, B, LA heads are found in two places.When searching for a small- block Chevy, beware of thin balancers, unless you’re looking for a 2. A way to quickly identify Chevy engines out of the car is by the shape of the crankshaft flange. Junkyard Engine Spotter's Guide - Car Craft.
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