I'm not sure how ordering from Fastlane ensures proper gap? Fastlane doesn't gap plugs, the mfg. does.
All the H9DC/H9DCO I've ordered were almost TOO small. Std. gap is .032. I agree with Larry. M103 motors idle smoother and run just fine at .036. MBDoc has mentioned in the past that .040 is good. I elected to use a gap in between .032 and .040.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.