Probably 3877178 on the block, see Leo's book pg 17, used for both 230 and 250.
Date L20 6 IIRC means Nov 20, 1966, so again could be either 230 or 250.
I've never had to pull the dist to read the pad stamp, but as Robert said maybe they didn't all have a stamp. Clean up down to the bare metal is only way to tell.
Twisted had a good idea, pull a plug - if there is dish, good bet its a 250. If no dish, good bet it's a 230 (or a 250 that somebody upgraded with flattops).
Again only way for sure is measure the stroke.
Last edited by DeuceCoupe; 12/11/10 05:15 PM.
