Karl Butler

Hello, I just bought my first corvette a c3 1981 with a 454 big block a tunnel ram and 2 holley 600 double pumpers works amazing at sea level but I car trailered it to Utah and have not started it because of the elevation change. I know I need to change the jets and adjust the idle screws but is there anything els I'm planning on going down 3 sizes of jets the altitude where I am is at 5000 feet and where I bought the car from was at sea level. Thanks in advance for the help.

7LitreC5

You'll also want to adjust the idle mixture. It will be too rich for sure.

ZZOOM06

You are also going to need to advance the timing 4 to 6 degrees.