![]() 2nd and 3rd digits = month of the assembly.The engine serial number in big and small Chevy engines is denoted by seven digits, each symbolizing a specific detail.īelow is the meaning of each of the letters and numbers in the engine serial number: It contains information about the vehicle’s assembly, power output figures, the make and model of the Chevy vehicle, as well as the engine displacement. It is also stamped on a machined pad that is then put on the engine after a full assembly. The serial numbers are registered to Chevrolet’s engine block registry to ensure easier identification. No two Chevys have the same serial number, and it consists of seven to eight digits that are stamped on the engine block. So, if you measure the stroke of your engine’s crankshaft and it comes out to 3.25 inches, there’s a good chance you have a 327.A Chevy engine serial number is a unique ESN (electronic serial number) used to identify every Chevy vehicle. This is different from the 283 and 305, which had a 3.00-inch stroke, and the 350, which had a 3.48-inch stroke. The 327 had a forged steel crankshaft with a 3.25-inch stroke. Crankshaftįinally, you can also look at the crankshaft to identify a Small Block Chevy 327. So, if you remove a piston from the engine and it has a small domed shape, it’s likely a 327. The dome was relatively small, measuring about 0.125 inches high. The 327 used a domed piston with valve reliefs that allowed for high compression ratios. The piston design of a Small Block Chevy 327 can also be a clue to its identity. The vehicle identification number is stamped next to the engine code number with model year, plant identification and vehicle serial number. 327 Casting NumbersĬasting numbers for 1962 to 1965 models generating 250 to 375 horsepower is 3782870 37898 to 1967 models providing 210 to 275 hp 37913 to 1967 models with 250 to 300 hp 38146 to 1969 models with 250-hp engines and 38309 models with 300 hp. Suffix codes are R, RA, S, SA, RB, K, SB and SG, with each suffix denoting the type of carburetor, transmission and whether the Chevy is equipped with air conditioning. Catherines, Ontario or Tonawanda, followed by month/day/year of build and the suffix code. Decoding the 327 Codeįirst letters of “F,” “S,” “K” or “T” denotes Flint, St. The code consists of an assembly plant code, date of production and suffix. The 327 Chevy engine is stamped on a machined pad on the front passenger side cylinder head usually behind the alternator. So, for example, if your engine block has a casting number of 3782870, the stamping number should be “F870.” Location ![]() The stamping numbers for a 327 should start with “F,” followed by the last three digits of the casting number. These are usually located on a pad on the front passenger side of the engine block, just below the cylinder head. The final way to identify a Small Block Chevy 327 is to look at the stamping numbers. Again, if your engine has one of these numbers, it’s likely a 327. These are usually located on the top of the cylinder head, between the rocker arms. Cylinder Head NumbersĪnother way to identify a Small Block Chevy 327 is to look at the cylinder head numbers. If your engine has one of these casting numbers, there’s a good chance it’s a 327. These are usually located on the engine block, near the bellhousing flange. One of the easiest ways to tell if you have a 327 engine is to look at the casting numbers. Now that you know what you’re looking for, let’s dive into the different ways to identify a Small Block Chevy 327. This engine was part of Chevrolet’s Small Block engine family, which also includes the 283, 305, 350, and 400.īut the 327 was unique in that it had a small bore (4.00 inches) and a relatively long stroke (3.25 inches), which made it a high-revving powerhouse that could produce up to 375 horsepower in its highest-performance form. Before we get started, let’s quickly review what makes the Small Block Chevy 327 so special. ![]()
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