Overlap causing reversion.
The reversion is basically spent exhaust doesn't fully exit, and a good fresh charge of fuel and exhaust then don't fully enter, and leads to a poor combustion (which also might be occurring from low-dynamic compression due to very low intake velocity from the big cam). Add it all together and there you have it...poor idle...
1979 Dodge Lil' Red Express - 360 rwhp, 13.2 @ 103mph 1968 Coronet: 318, 2.76, 15.2 @ 92mph! (SOLD) 1976 Valiant: 360, 3.90, 12.90 @ 106 (SOLD) 1989 Shelby CSX #500/500
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