Before you install the B18 head -- set it up on a workbench upside down. Carefully pour gasoline into each combustion chamber. If the valves seal properly you will not see any gas at the intake or exhaust ports. I've been following this thread and even with 48 years experience with the B18/20 I am totally baffled. Are you sure you have the procedure for setting the cam timing relative to the crankshaft? Dots on the timing gear and crankshaft gear facing each other---which BTW, is TDC compression stroke for cylinder #4 (closest to the flywheel)-- Dave
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