What engine IS this????

[Andy Ramm <aramm@concentric.net>]

My '67 B is equipped with an engine that according to the DPO is a rebuilt
replacement, not the original.  But, it has a very strange engine #.  It's 
18G-RWE-H31882.

The 18G part would suggest it's an early 3-main motor.

I've never heard of an R specification, but the WE would suggest vintage
between late '67 and early '70.

H means high compression, but I have no clue what a 31882 number would
suggest.  Can someone shed some light on this?  I'd really appreciate it!

Thanks,

Andy