oldenough

Can someone decode these numbers for me on this 66 coupe?
L 12
437 A 4954
trim 407 972

66jack

407=Red Vinyl
A= 4,954 one built at the AO Smith plant..
L12..?

oldenough

How do I know if this vette has matching numbers. I know it now has a 350 small block with a 3 speed auto tranny.

leif.anderson93

L12 is assembly date - July 12 (AO Smith Body)
437 is coupe designation
A4954 is sequence number
407 red vinyl interior
972 Ermine White exteior

SoCalErv

The L12 on the Trim Tag is the date of the car. I do not have my books with ne so hopefully someone will chime in.

For the question of numbers matching; you do not have the original block as only 327 blocks were available in this year.

DansYellow66

If it has a 350 and 3 speed auto it's definitely not a numbers matching powertrain.

65GGvert

Original automatic transmissions were powerglide, 2 speed.

tuxnharley

And '66 Corvettes came with either a 327 sbc or a 427 BB. The 350 sbc was not available in Corvettes until 1969.

oldenough

thank you all for your replies. I am sure the motor and tranny are replacements.

rtruman

Swept57

Not original, but post the numbers from the pad on the front of the engine to find out what you do have.

The 350 in mine turned out to be a 73/74 one-ton truck engine!

oldenough

I did see these two numbers from pictures sent since I have not been able to check myself
6127101F0706110
88713575

66jack

They need to be broken up to make since...

Is that 'exactly' how they show on the block or the pictures you got?