The hardest thing with slowing a motor down is that most gas motors don't have enough rotating mass to compress the next cylinder of air so the motor stalls. Big blocks defeat this just by size. Ping masters do too. But a 302 is a relitively small motor. Even with a cam profile that is stable at low idle speeds the compression may just stop the piston before the next power stroke.
Ways of beating this are adding rotational mass. Like a heavy flywheel and maybe even a heavier harmonic balancer.
Good luck and lets us know how it works.
I would like to find a 4 banger (and with small displacement) that can keep it steady down to something like a 150 rpms.
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