I think I have a leak (So what else is new...)  Heres my questions on this advanture

How hard of a job is it?

What do I need other then the core to do this right the 1st time?

Being no one uses a C3 heater, is there any prob or heads up if I just bypass it?

Thanks!  Kevin.

 Only reason I want a heater core is foggy windows in the morning, and I might use heat to cool engine when in traffic jam.

 No probs on a bypass

Getting a quality replacement core that fits will be your biggest problem. I gave up and had the old one fixed up. The tubes from the replacement core never fit correctly, so I sent it back.

It's not real easy job, but I do suggest replacing all of the old seals and hoses...they will be totally disintigrated and lots of crap will be in there - leaves, pine needles, dog / cat hair...yes really.

Kevin,

To pull the core on my '68, I had to pull the right side of the dash & the center instrument cluster. 

After you pull the connecting vent you have to take out the entire heater box, disassemble it & change out the heater core.

Many people use a basic in-line valve to shut off the flow to the core due to a hot cockpit, so that's always an option.

Good luck,

Anthony

I looked up on the labor guide for an 81 Vette heater core r&r. It calls for 5 hrs. labor. I would suggest getting a procedure guide. If you do get an aftermarket heater, I would suggest getting it from a radiator shop. They can beef up the pipes for you, as they are very long and can break loose at the solder joint. The part number for the heater I sell is 2-328 or 8231. You can do it!! Or bypass not a problem. Terry