Joe refresh my memory. Did you increase the compression? Is this cam bigger than the stock cam or is this the stock cam? Sorry to ask what I'm sure has already been written but I don't remember or have time to read through 96 posts to find out, LOL... Anyway my reason to ask is if you didn't increase the compression (or even if you did a small amount) I don't think advancing the cam 4 degrees would hurt. If the cam is bigger than the stock cam it surely wouldn't hurt since it probably won't make as much low end pressure. At the worst you might have to run mid grade fuel but I think the perf. boost would even be worth that.
Nominal CR for these is supposed to 8.8:1 but after taking 7cc's out of the chamber and taking another .037" out of the deck, I'm running a measured 9.23:1 CR. This is from taking true cc measurements of the chamber and deck/piston plus adding in the measured diameter of the gasket bore and compressed thickness. The cam is stock for a '92
Speaking of how Ford retarded their cams for emissions. I think some others did it too. Back when I was a kid I had a 74 Monte Carlo with a 350 4 barrel. I read in a magazine that mentioned them doing that also so I bought a new timing set with the 4 degree advance/retard keyways and put it in 4 advanced. Man did it run better. Felt like it picked up 25-30 ft. lbs. of torque.
