Not sure how long a 408 will live, but I can tell you that the 377 is the quietest engine I have had in the pantera. No piston noise at all as compared to the 351. I must say that a quieter engine implies less stress on the pistons and less stress on the cylinders. It is also quiet at high rpm. And it actually sounds like it likes to rev just like new modern engines. The 351 sounded like it was ready to explode at 5000 rpm.
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