The date code and casting numbers are mainly for identification and quality-control purposes. WHAT ARE THEY?īut first, let’s give you a little background on why the numbers are there. In the next few paragraphs, we’re going to tell you where to find the various codes that matter for the engine. The engine components themselves (block, heads and intake) will have various casting numbers, date codes, and an engine identification code, all of which are important and should be correct if the car is to be considered numbers matching. These include the engine, transmission and rear-axle assembly. A true “numbers-matching” muscle car is always worth more than one with unoriginal drivetrain parts, so the question is, how do you determine what is and is not matching numbers? It’s really not that difficult, you simply need to know where to look and how to read what you find. In a nutshell, matching numbers refers to the various codes and dates found on all the major driveline components. Usually there’s a hefty price tag associated with those numbers as well. You’ve seen and heard it before: “Numbers matching”. OR, HOW TO TELL A NOVA 396 FROM A DUMP TRUCK 366…
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