carnut222 I mean if they changed to 13 mm rods in 1990, and they re-coed engines after 1990, would they continue to use old 9 mm rods, or would they rebuild them with the newer spec 13 mm rods?
My guess is they would have used 13mm rods on the rebuild. 9mm rods were a known point of failure, and when the 13mm rods came on deck, they shared the same part number as the old 9mm rods. Only early K-blocks in year model 1988 had 9mm rods (the parts books say 9mm rods were in "a few engines" when referencing the K-block with its 63mm main bearings).
The Cheat's Way of checking out the rods is by using the mechanical fuel pump cover, below and rear of the distributor boss, as an inspection hatch.
