I am trying to do some research for a job I want to accomplish on the challenger, but I am away from home for a while. Looking for the dimension of the square/rectangular electrical bulkhead opening on the firewall. If anyone has easy access to check for me that would be hugely appreciated!! 70 Challenger...

Cheers

From what I recall, the E and 71-74 B body cars had the same dimensions as earlier B cars only the bulkhead is clocked 90 degrees. Maybe someone with one of these other cars can help?

Good thinking Frankenduster, and thanks for the bump

Well if that's the case I have a 68 B Body for reference. The bulkhead opening measures approximately 2-11/16" by 2-7/16".

You are correct about the E Body being clocked different than the 68-70 B Body. It does appear that both openings are the same dimensions but the E Body has rounded corners. I cannot confirm the E Body dimensions because I do not have one to reference to.

Here's a side-by-side pic to explain. The 68 B Body is mine and the 70 E Body was a random internet pic.

Hope that helps.

Thanks! I got a response from cuda-challenger forum. The e-body measurement there stated the dimensions were:
-2 3/8 x 2 3/4"