I just finished installing the new motor in the Blazer, and am having some issues I hope some of you can shed some light on. The motor is as follows: 4-bolt SBC 355 roller block with 6" rods and 6" style pistons Comp Cams 08-500-08 Roller lifters, hardened pushrods, 1.5 roller rockers 305 style heads opened up to 63cc with 1.94 and 1.5 valves Guesstimated 9.5:1 compression Edelbrock performer dual plane manifold Brand new SMI Stage 2 Quadrajet Hooker super comp shortie headers The issue I am having is dieseling when shut down, but only once it's warmed up. If the motor is warm, and I turn it off, it will diesel for a bit, then shut down with a large spray of fuel coming out of the carb. This makes me think it's running very rich. I've tried adjusting the timing to 0* and 10*, and the same thing happens. I've checked for vacuum leaks, and cannot find any. The only vacuum lines hooked to the carb are the vacuum advance, and the line which goes to the vacuum reservoir/HVAC controls. The only vacuum lines hooked to the manifold are the brake booster, tranni line, and PCV. The idle is not that high, but since I don't have a tach, I'm not sure exactly what it is at. I put a vacuum gauge on the manifold, and it read 15 on the gauge. When I installed the motor, my brother gapped the plugs and put them in. I found out yesterday he gapped them at .038. I know factory recommended is .045. Should I run the factory gap with this motor, or should I run some other gap considering the build up? Could the .038 gap cause the dieseling problem and fuel spray upon shut down? Any help/advice/opinions are greatly appreciated! Thomas.