pinging on an hill?

63dartman said
I was coming up a hill today and put the pedal to the floor at around 35mph. It kicked down a gear and took off. My problem is it started pinging pretty bad. I am running 12* advanced initial and 35* total with no vac advance. I am running a holley 670 avenger out of the box. 360 10:1 compression, lunati cam with 1.6 clearwater magnum heads. lift is about 490 duration is pretty mild just a street cam. I did notice that my plugs are VERY clean. I can't tell if I'm lean because there is nothing at all on the plugs. Should I try going up two jet sizes at a time on the primary and secondaries?

Magnum heads require less total advance than open chamber heads. Try setting the total to 32-34. Also, how quick is the timing coming in? You want to use springs that have it all in around 2500 rpm.

I am running a 670 on a 360 with magnum heads and 10.6:1 compression. The stock jetting on my set up is as close to ideal as I am going to get without an air/fuel meter. With today's gas if you can see a distinct tan color on the center insulator you are to rich.