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That car didn't come with a 350. The V8 available for that Monte Carlo was the 305 which took the ACDelco R43TS spark plug.
the spark plug gap for 2004 monte carlo ss 3.8eng is .060
The recommended spark plug gap for a 2000 Chevy Monte Carlo 3.4 V6 is .060"
It is important to gap the spark plugs at the right size. The spark plug gap for a 1981 305 Monte Carlo is .045 inches.
.035
.45
The spark plug gap for a 1995 Monte Carlo z34 is.45 inches. New spark plugs come preset, however, and should not need adjustments prior to installation.
ACDelco #41-601 conventional spark plug gap .060"
.060
60.
ACDelco conventional spark plug 41-601, .060
.30 Just get a spark plug gapper to see what your gap is and adjust accordingly