[leddzepp]

Originally Posted by 1-PU70

Last week my 402 was acting up. I'm in FL and the temp is low to mid 90's every day. After I would turn it off for about 10 to 30 min it would start as usual but I would get some major hesitation if I would accelerate more them half pedal for about 5 min. Then it would clear up. Now this never happened before. The only change I made was to switch from premium to regular gas. But that was about 2-3 months ago. Here are the changes I made since. Changed from a 180 to a 160 thermostat and changed fan and clutch from a 19"- 6 blade-2 1/4" pitch regular clutch to a 18"-7 blade-2 1/2 pitch with a heavy duty clutch. Runs a bit cooler and cools down faster. Engine specks are a 1972 truck 402. rebuilt about 6000 miles ago. All stock except a roller cam(kind of like an RV cam) HEI, high flow aluminum water pump, cast iron high rise intake and a stage 2 JET carb and a compression ratio of about 9.1:1 to about 9.5:1. I don't drive it that much anymore so I don't know if those's changes have made any difference yet. Good luck.

With that high of a compression ratio, I would start by switching back to premium gas.