Mercury crankshaft

[olfarmer]

Working on a 8BA found three of the four plugs you drive in the crankshaft was in the oil pan. I have threaded the holes with 3/8 NPT tap. My question is would you install aluminum or steel Allen headed plugs? The steel plugs weigh about 132 grains and the aluminum plugs weigh 64 grains.
Thanks in advance for your help and advice.

 

[cadillac512]

I'd use the plugs closest in weight to the originals. Likely aluminum.

 

[Ol' Ron]

Aluminum , closer to the original plugs.
Gramps

 

[hotrodart]

Maybe use some thread-locker to keep them from falling into the oil pan again.....