I was typing when you posted that. I went a got a BJYL memcal (95 5.7 TBI $0D) and measured it. Now bear with me as I am using a cheap craftsman multimeter. With it on the 20k setting, it reads 0.86, on the 2000 setting, it reads 865. The number in the red circle is 26.

Next I tested a BNKM memcal (95 P30 5.7 TBI $31) On the 20K setting it measures 2.26, on the 200k it measure 2.6, on the 200 setting it reads nothing. The number in the circle is 34.

Tested a BJYM, it tested the same as the BJYL, same number too on the board.

Last I have is BJKW (95 7.4 TBI $0E) it measured the same as the BNKM memcal and has the same number on the board.

Now that is really strange, seeing as how BNKM is a 5.7 memcal, bcc find puts it as 5.7/4L80E, and I specificly remember pulling it from the van and it definately had a 350. Yet it appears to use the exact same knock filter as a 7.4.
Humm (scratches head)