Flexplate is not fits the torque converter
10237 is NOT equal to 10242.
BMM 10230-MAGBAL is a B&M 10230 the Hughes cuts to match the discontinued 10242. They cut the proper size and shape notch into the 10242.
For reference, I will add a photo of the 10236 LA 360 balance on top of a 10242 Magnum 5.9 liter balance.
It is normal for the cutout on the B&M flex plate to be opposite location of the factory Magnum flex plate weight. That makes the side with NO cutout heavier to match the position of the weight.
10237 is NOT equal to 10242.
BMM 10230-MAGBAL is a B&M 10230 the Hughes cuts to match the discontinued 10242. They cut the proper size and shape notch into the 10242.
For reference, I will add a photo of the 10236 LA 360 balance on top of a 10242 Magnum 5.9 liter balance.
It is normal for the cutout on the B&M flex plate to be opposite location of the factory Magnum flex plate weight. That makes the side with NO cutout heavier to match the position of the weight.