Anyone getting more than 3 gallons on an STS better start playing the lottery, cause you are one lucky individual. Take one apart and compare the innards with a good quality mill like a nova.....it's amazing they even run and obvious why the sleeves crack like an easter egg on the freeway. Anyone that recommends one.....you can write off any credibility for that person whatsoever.......
If you must have a cheap motor and are looking at a .28, get the mach 427 for 90$ off ebay, 3 times the motor the sts is......
If a .21, look at the nova 3 port.....