I,ve done a lot of checking and just can't seem to find an answer.
Question:
How can you tell if that white piggyback board on the prom unit (the ESC module) is fo a 305 or 350? Is there a way to decipher the numbers printed on it or a data base to look it up in. I got whats supposed to be a 350 prom from fleabay and there are no original stickers on it. I dont want to put a prom with a 305esc in my 350.
The number on the esc is 1J9306.

 

The 1 I think is the production series or place of production, the J is for 3.1L 60 deg V6, both NA and Turbo. the 9 is the year 89 the 306 is the 306th day of the year.

 

There was a memcal on ebay recently that was stated it was from https://www.affordable-fuel-injection.com/

I informed the seller it was not a v8 memcal it was a modified v6 so the knock sensor will not work. he didn't seem too car too post that information. There will be a jumper installed to get the cylinder select correct too a v8 form pin 56 to 62.

 

To ID the knock filter need to measure the resistance between two of the pins/legs. See the picture, lower left pin (2nd one in) and the top center pin. The pins/legs have the white paint dab next to them.

An L98 filter will be 18K ohms
An LB9 filter will be 14K ohms

Moving to DFI & ECM board...

RBob.

 

the v6 one will show around 46.8K pin 31 to 48 like rbob showed the picture of.