as far as i know there was never any company offering an actual aftermarket casting. you can get very well built rebuilds from companies like agostino racing engines but they cost.
personally i would never buy anything that said jasper on it. i have seen the insides of their "high performance" engines that are used for teh jasper sprints, what hunks of crap. unmatched machine work and parts. i can't imagine their stock rebuilds would have any more care into them.
if you have a reliable machine shop around they can rebuild the bottom end properly for you, then you can do the rest of the assembly yourself.
later
tim
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