Want to put a magnum 5.9 in my 70 dart.

318willrun said

Is that a "904" thing or a PTC thing? I've used the same flexplate for both 904 and 727's

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I think it’s because it’s their higher end/race 9.5”. It’s close to fitting, it could fit if you beveled the crap out of it.

I assume that PTC designs this converter with an aftermarket/sfi flex plate in mind. Just my hypothesis as I bought the converter used and then the problem presented itself.

If I’m totally honest I wasn’t aware that the magnum was different from the LA in that regard, so it’s been trial and error for me.