409 2x4 Intake Manifold Code

[chevyjason]

Hi,
I have bought a 409 intake with casting code - 3814881
It is cast at the rear of the intake just behind the carb.
Can anyone tell me what it is correct to suit? Thank you,
Jason

 

[MK IISS]

Jason: Your #3814881 intake was used on the '62 409/409 and '63-'64 409/425 engines.