OK, guys, i've tried everything I can think of and nothing is working. Here's to hoping someone can point me in the right direction....



It all started when I developed what I thought was a vacuum leak in the intake manifold. Pulled the intake, found major tear in the gasket, replaced.it. Put everything back together(with a new BG Demon), the engine ran smoother but had a bad pop(sounds to be a crossfire, IE ignition) so I pulled the cap and rotor to check. Found the distributor was virtually rusted to pieces(nothing else in the truck is rusted--anywhere), so I promptly sent it back to MSD. They have since told me that the distributor was indeed bad, fixed it and sent back. However I have another MSD distributor new in the box, so I used it and nothing changed. This problem exists ONLY when the engine is warm to hot, in the 155 to 185 and up range. When it first starts up, it runs perfectly and once it is hot, I can't stop the popping. I've tried moving the timing all over the place to see if the marks slipped, but to no avail. Not sure exactly where to go from here.



292, rebuilt 30 over, 3000 miles on the rebuild with zinc supp

G heads, rebuilt, heavier springs hardened seats 1:5:4 rockers

Stock cam

Blue thunder

MSD Pro billet, 6AL, Blaster coil, MSD wires, AP45 plugs (and yes, they wires are in the correct order on both ends)

Reds Headers, no crossover straight out the back

Road Demon jr 525, or Holley SA 575

195 degree thermostat, temp reads right about 185



Compression checks at about 110, ran the valves, 19 thousandths.

No vacuum leaks.

Spark at all cylinders

All wires have been check for resistance



Anyone want to take a stab??




My name is Greg and I am addicted to Y's.