Switched back to a stock 3.58" stroke. Not sure what those pistons' speeds would be without breaking out the math book. I feel confident about it as I've seen and talked with a few guys that have run 340s with stock stroke and old heavy TRW slugs up to 8,500+ rpm. Nonetheless I completely understand your point. I have thought about an R block. If I do stay with the factory block it will be very well prepared by a professional.
