I live near Jasper, Indiana which is the home of jasper engines. I think there was a time where they used to used to be good, but like many things they will save a nickle and sacrifice quality.
I have heard Jasper doesn’t honor their warranties with out a fight, BUT, How many of those issues were due to poor installation? Im not sure.
Jasper was owned by a rich family in Dubois county Indiana and if you try to sue them they have the legal system in their pockets, so it isn’t going to happen. Typical good 'ol boy network. Now I think they are employee owned, but im not sure.
That being said, I also heard the Jasper sells 10,000+ units a month and has a less then 1% failure rating, Good if you ask me.