One thing that puzzles me, is there has to be more to a knock filter than simply matching it to the engines bore size. If it was as simple at that, then should it not be the same knock filter on the tpi 350's and the tbi 350's, and even yet, since the 4.3 v6 has the same bore and stroke as a 350, then in theory should it not use the same one too? Be we know it does not.
But I knida agree with 1project, I think I would probably try and mpfi mod a 350 tbi memcal before I used a jumpered v6 memcal, I would think a tbi 350 knock filter would be a lot closer than a v6 one.
Has no one really tried that, or has it been tried and failed, and we just dont know about it? I could use the mpfi modded tbi memcal from my Jeep and put it in a 7730 on my test harness and run it to see if I get any error codes, if anyone cares?