6 cyl engine decode

[lykaneagle]

I have myself a 67 camaro convertible 250.  I'm trying to find out if the inline 6 250 is original to the car.  No serial numbers were stamped on block so I can't confirm that way.  There is a code of 0810FM on the block.  The FM suffix is corrrect for a 67 camaro.  From what I understand, the 0810 means August 10th? .....but my trim tab shows my car 04A (first week of April).  So that doesn't add up unless the 0810 engine code is referring to 1966.  Is that possible?   The car has about 80K original miles so I can't imagine someone putting an entire new engine in this.......especially another period correct six.  Any input would be very appreciated.  Thanks much!

[lykaneagle]

Update:  Engine code is F0810FM

Thanks for the help and have a great day

[ko-lek-tor]

Are you positive that IS the #, F0810FM? Because 0310 instead of 8 would put it right in the ballpark, so to speak. See if you can get the casting date off the block, and head, while you are at it. If we get enough info, we (CRG) will figure it out.

[lykaneagle]

best I can tell for casting # is 3859381 with GM 22 underneath.  Some of the 3's and 8's look similar but I think I have it correct.  The engine code is F0810FM NOT F0310FM

[lykaneagle]

Also found 877178 with either a "O" or a "C" at the end with GM29 underneath

[1968RSZ28]

best I can tell for casting # is 3859381 with GM 22 underneath.

3859381 is the casting number for the intake manifold, not the engine block.

Paul

[1968RSZ28]

Also found 877178 with either a "O" or a "C" at the end with GM29 underneath

Check again, the block casting number should be 3877178.  Also, what is the engine block casting date?

http://www.camaros.org/drivetrain.shtml#BlockCast

Paul

[lykaneagle]

Funny, there is no 3 in front of the 877178??  The casting date is G76....July 7, 66?   That's starting to make more sense.......
I wish I could get a picture up.  I've set my camera to smallest resolution but the file's still too big.

[KurtS]

What trans is in the car?

[lykaneagle]

When I got the car the motor had been swapped to a 350 and a 700R4 tranny.  I have the original(?) inline 250 and powerglide tranny. I think I figured out the pic problem.  If so, i'll post....

[lykaneagle]

stamp..

[KurtS]

I think that's the original engine. I see two other March cars with Aug 66 FM blocks - could have been pushed back in the corner or.....

[lykaneagle]

Hey that's good news!  In twenty years I just may put her back to a numbers matching sweetheart.  There weren't too many 6cyl convertibles made.....may be the "thing" someday.   Thanks so much for your help!  This site is the best