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The key to making a 10:1 compression cast-iron head motor run well on 91-octane fuel lies within the spark curve. Our Pertronix distributor used a slow advance curve to keep timing out of the cylinder while the engine was under a load at low engine speeds.
King Vortec

The key to making a 10:1 compression cast-iron head motor run well on 91-octane fuel lies within the spark curve. Our Pertronix distributor used a slow advance curve to keep timing out of the cylinder while the engine was under a load at low engine speeds.  View Related Article