307 9 or Y

[RollinSingle]

(edit: If this should be in the engine section please move it)

I have spent several hours looking for an answer. Here is my question: If you had a vin 9 motor and a vin Y motor sitting side by side, how do you know which one is which? Assume both are fully assembled from carb to oil pan and you cannot take them apart. I am used to chevy engines and running block casting numbers to derermine what the engine is, but Olds seems to be a little different. There is a casting number on top of the front cover next to the oil fill tube (3161 GM 5.0L G) and all I can come up with is "code 5A 1981-? 307"... The motor also has 5A heads and an A4 intake. I am hoping to determine if it is a 9 or a Y and what year it is from. Eventually I will disassemble and rebuild the motor, but I don't want to scatter the parts and then loose some or have them be in the way.

Thanks in advance for any help.

 

[Joel86Cutlass]

Maybe this will help

http://tech.oldsgmail.com/307_diff.php

 

[RollinSingle]

Thanks, I know what there differences were on the inside, I was more curious if you could tell on the outside.

This is the best info I can come up with:
http://www.442.com/oldsfaq/ofe307.htm#E ... gineDetail

 

[Joel86Cutlass]

Yeah your guess is as good as mine.

Sorry I couldn't be more help.

 

[Blake442]

I think the only real physical distinction would be the dual snorkle air cleaner, the numbers on the carb, or the bar-code label if it is still on the valve cover and if it is legible... You might be able to run those numbers. That's how the '80s era motors are identified, kinda like how they had the two letter sticker that wraped around the oil filler tube in the '60s and '70s...

 

[RollinSingle]

The air cleaner is long gone, the bar code sticker is still on the valve cover and can read it perfect. What should the numbers be on the covers and the carb?

 

[Blake442]

Not sure about the valve cover decal, but the carb numbers were listed on one of those links in the posts above me.