273 commando Build

stroker402 said
plugs all looked fine a nice light tan brown color champion n9y .035. the timing mark on the spark plug strap was near the base ring not an the curve point on the strap. timing set at 16 initial 18 in the plate and 34 total.

At what rpm is the timing in. There should not be brown on the plug. That’s fat.

Edit: At your compression a 9 is too cold.