Okay. Well, I run an M21 behind a 427 big block in my Corvette making a minimum of 530 horsepower and it works well. I should be running an M22, but I run what I've got until I can afford better.
A friend of mine ran a wide ratio M20 behind a supercharged 327, and later, a supercharged 350 in his 68 Camaro and it worked fine.
Neither one of us has experienced a cracked case. So do you listen to what somebody has told you, or do you listen to experience?
I am in agreement that the Muncie is probably not the best choice for a straight-6 engine because the gear ratios aren't suited for something without 350 lb-ft or more of torque.
But really, Muncies have been and are still used very widely in muscle cars that make a lot more power than the factory provided originally, and you just don't see these things blowing up like many of the overdrive transmissions are.
If they had such a nasty reputation, they wouldn't be priced so high, nor have such a following among the faithful.
But you're entitled to your opinion. Just setting the record straight.
