Suffix codes are either alphabetical or alphanumeric. Some engine machining operations (decking) will obliterate the engine ID.Įngine ID Code Example: V0101CLJ - (V = Plant, 01 = Month, 01 = Day, CLJ = Engine Suffix Code)Īnother example: T0830CTY - (T = Tonawanda, 08 = August, 30 = 30th day, CTY = 1970 396 Camaro, 375 hp, 11.0:1, TH400) Engine Plant Code Code The engine date must precede the car build date, otherwise something is amiss. V8 codes are stamped on a pad just forward of the right side (passenger) cylinder head. ENGINE CODE STAMPING NUMBERĪll engines are stamped with an engine ID code, consisting of assembly plant code, production date and suffix code. The point of this page is to help you figure out how to decode stuff. Lastly, in extreme cases, you'll want to verify the numbers stamped onto the component were the ones stamped into it originally and aren't restamped. You need to decode the engine and see if it matches the vehicle, and if the code signifies Z28 or SS equipment. Numbers matching is important when you're trying to decode a Z28 or Super Sport where the VIN won't identify the vehicle as such. But numbers correct is not numbers matching. Some folks use these terms loosely, or will say "numbers correct" or something to that effect. If it does - it's "numbers matching", otherwise - it's not. The partial VIN will match the vehicles VIN. This match is done via the PARTIAL VIN stamp on the component. When people say "It's numbers matching" - what they mean is the engine (or other component, i.e the transmission) can be MATCHED to the vehicle it was originally used in. This is my opinion, and the generally accepted norm: The engine code and partial vin # will accurately nail down whatever the thing is rather quickly, and the other information will fall into line with that. The primary pieces of information you'll decode are the This topic can be somewhat confusing, especially with the amount of information available and the interpretation of it. My wife is getting sick of hearing me whine about the choice.Home name history competition hk ht hg hq hj hx hz vx identification models links Chevy Small Block V8 Engine Identification I'm just damn glad I found this forum full of folks that knows what I'm going through. I'd get to pick and mount my own motor, so I'd be sure to be happy with the results. But now I've had some time to think a bit, the $700 car seems really attractive. I was really sure I wanted the one with the V-8 already mounted. So, do I want to pay $1300 extra bucks for a motor I know I'm going to be taking out anyhow? If it had a nice 350 in it, and I knew it was a proper conversion, it would be a no brainer. Now, heres my snagging point: The one with the V-8 is $2000, the one with the stock motor is $700. The tach isn't hooked up, which makes me think maybe they didn't buy a kit. I can't tell which kit is used to mount the V-8 or even if it is a kit. One has the stock motor which runs, but badly. Neither is rusty, both have terrible shade tree paint jobs. Interior is shot, exterior is ugly, but salvagable. Locally, I have 2 Z's I've looked at that I'm considering. I my mind, theres no sense in buying a car with a V8 when I know I'm taking out the V8 to put in a different V8. Chilton's manuals used to list these codes. If the engine has been decked, could be gone. If it runs well, leave it there and enjoy driving it while you build a killer 383 or 406.Īctual engine codes should be stamped on the block's deck surface in front of the (US) passenger side head. Sort of depends on how GM was feeling the day it was cast. The 'soft block' tale is BS: I've run across 307s with high nickel blocks. Still, not a great choice for hot rodding as parts are same price (or more) than the more popular 350s. sure, it's down on cubes, but how well it runs depends on the parts added (heads, cam, intake/carb and exhaust), and how tired it may be. I've never understood why the 307 gets so thoroughly dissed. Sounds like if I got it, I'd still be putting a motor in it, so I screwed either way. This car jumped out at me because it already had a V-8 in it, so I could put all my money into the body work and interior it needs. I began my search for a Z thinking I'd do a V-8 swap. For 200hp, I'd just as soon leave the 6 cylinder in there! It does have a 4 barrel on it and a cam, so maybe it's been given a few extra ponies, but probably not what I was looking for. Something about the block material being softer than normal. I'd never heard of a 307 before, but after looking it up, I can't really find much good about them. I'm a little bummed now, I was really hoping it was a 350 in there. I guess maybe you guys are right, maybe I did write down too many numbers.
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