did you have any luck with the after market part?
lots of these have now turned to dust in britain, looking to source a couple and interested if there are any alternative options.
cheers.
if im reading your post correctly i agree, any well tuned/fueled/boosted/intercooled 1HD FT would make these marginal gains irrelevant.
non the less, a very interesting read and thanks for taking the time to post Vadim.
yes its wrong, i ran into this years ago. off the top of my head its 45 nm.
can confirm in the morning as its permanent marker penned on one of the walls of my workshop...
depending on your budget though, a sleeve would work out cheaper, as you can use a standard sized piston and hone/ use new rings on the other cylinders. providing the other pistons/bores come up to spec.
imo your machine shop should be telling you what make of sleeves they will be using based on experience. mine did on a couple of 1HD T blocks i had sleeved. its hard to tell from pictures, but they were in far worse condition than what you have there.
is the bore not in tolerance of a rebore...