Thread: 302 Stroker??

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One vacuum gauge is installed permanently in the dash, and I wish I knew who had a distributor machine.
Right now I've got the advance stretched out to 40' at 2200 rpm... but I was reading one of RSpears posts and he mentioned that he was cautioned that the pistons wouldn't tolerate that.. I think I may back off just a bit, get the advance back to 35 / 36.

Originally Posted by 34_40

One vacuum gauge is installed permanently in the dash, and I wish I knew who had a distributor machine.
Right now I've got the advance stretched out to 40' at 2200 rpm... but I was reading one of RSpears posts and he mentioned that he was cautioned that the pistons wouldn't tolerate that.. I think I may back off just a bit, get the advance back to 35 / 36.

Like Dave says, it's easy when you're playing with a Spark Map, just boxes on a chart! My limit came from the fact that I have KB Hypereutectic pistons, and KB puts a 36 degree limit on timing for those pistons. Other pistons don't carry that limit, and even with that limit mine pushes up to 40 degrees at and above 3000rpm when MAP is 10"HG or less. Basically, this is an economy setting because the only way the engine can ever see that part of the curve is throttle closed coasting down a hill with high rpm. That feature came from the guy at Edelbrock, and he said that they often crank up to 44 to 46 degrees in that zone because it's almost never seen and there's virtually no load on the pistons at that part of the map. I chose to limit mine to 36 degrees under load (MAP 12 and above), ramping up to a peak of 40 on the lines for Zero and 10"HG above 2500rpm. If you're in that zone and blip the throttle, total timing drops immediately to a peak of 36 - boxes on a chart, telling the ECU what to do.