another numbers request thread, sorry - Impala Tech
Tag Team De-coding tags & numbers

 
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post #1 of 4 (permalink) Old 03-08-2012, 09:51 AM Thread Starter
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another numbers request thread, sorry

Sorry guys I know this is a worn out request but I need help. I found a '65 SS I would like to take a look at. I have found enough reference material to be able to decode the trim tag but I'm asking for some help with engine codes.

I know the engine is a non original small block but can someone help me with some casting numbers that would differentiate a 327 from a 350 and from which vehicle it originated (Chevelle, Impala, year, etc?)

thanks in advance,

Regards,
Bob
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post #2 of 4 (permalink) Old 03-08-2012, 05:39 PM
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The 327 and the 350 used the same 4.000 bore block. Casting numbers will not help you distinguish between the two blocks that way. Only the crank and pistons are different as a 350 is a stroked 327 (a 327 stroke is 3.250 inches and if you stretch that out to 3.480 inches you have yourself a 350).

Chevy did the same thing with the 283 in 1967 it stroked it out to displace 307 inches by replacing the 3.000 inch 283 crank with one out of a 327 that measured 3.250 inches. I never understood why people say a 307 is bad and they would rather have a 283. It is a 283. Everything that makes a 283 go makes a 307 go just as well.

Now the 305 is a whole different story. It is a horrible engine because Chevy took a 350 crank and stuffed it in it's own two bolt block. They reduced the bore down so much that a 2.02 inch intake valve just about scrapes the cylinder walls the bore is so small. (That is why the 305 has heads that are equipped with a 1.94 inch intake valve, and why putting on bigger heads kills what little power it makes).

To solve your problem you need to look at the numbers stamped on the engine identification pad. The two or three letter code is relatively unique (it does repeat but not with the same type engine) and will tell you when it was built, what size it is, what the horsepower rating was, what car it was installed in and what kind of transmission and carburetor that it had.

Big Dave
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post #3 of 4 (permalink) Old 03-08-2012, 06:53 PM Thread Starter
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Thank you Dave.
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post #4 of 4 (permalink) Old 03-22-2012, 11:17 PM
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Quote:
Originally Posted by Big Dave View Post
The 327 and the 350 used the same 4.000 bore block. Casting numbers will not help you distinguish between the two blocks that way. Only the crank and pistons are different as a 350 is a stroked 327 (a 327 stroke is 3.250 inches and if you stretch that out to 3.480 inches you have yourself a 350).

Chevy did the same thing with the 283 in 1967 it stroked it out to displace 307 inches by replacing the 3.000 inch 283 crank with one out of a 327 that measured 3.250 inches. I never understood why people say a 307 is bad and they would rather have a 283. It is a 283. Everything that makes a 283 go makes a 307 go just as well.

Now the 305 is a whole different story. It is a horrible engine because Chevy took a 350 crank and stuffed it in it's own two bolt block. They reduced the bore down so much that a 2.02 inch intake valve just about scrapes the cylinder walls the bore is so small. (That is why the 305 has heads that are equipped with a 1.94 inch intake valve, and why putting on bigger heads kills what little power it makes).

To solve your problem you need to look at the numbers stamped on the engine identification pad. The two or three letter code is relatively unique (it does repeat but not with the same type engine) and will tell you when it was built, what size it is, what the horsepower rating was, what car it was installed in and what kind of transmission and carburetor that it had.

Big Dave

and I thought it was just me.... Thanks, Dave
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