Jason, I ran a 1515 on my 235 (along with a cannister type by-pass filter) for approx. 140 K mi. When pulled for teardown it was reported to be very little wear & super clean. Was done as a story by the next owner in Classic Trucks mag. Was reported to still show the honing cross-hatch marks in the cyl. walls & the crank only needed polishing, not regrinding to be re-used.
I gave no thought to the by-pass press., I just always use that P/N due to it having a large filter area & being a very popular P/N for store stock. Using one on my current 292 motor in my '55.
Doug
