[Alan Roehrich]

When you combine the advantages in weight, ring grooves, and stability, the difference can be substantial. The TRW stuff weighs a ton, and really can't be lightened a great deal without causing problems. You can, and should, change the wrist pins, and have the pistons pin fitted, that will save weight, and increase reliability. I wouldn't spend any more than that, and balancing, on the TRW pistons.