Do you know it is the starter or are you just guessing?

Just because a car won’t start doea not mean it is the starter… It can be anything from battery, fuel, one of dozens of sensors not reading correctly, dead key, immobilizer issues, computer modules no good, vehicle possessed by the spirits of the damned…

What makes you think it is the starter?

Also what makes you think anyone here could give you any sort of answer when you don’t bother telling us whatever the fuck you are driving??? Is it a Dodge Caravan? Perhaps a Dacia Sandero??? Or maybe a Honda Super cub?

Pistons vs valves never makes it past round 1.

RIP engine

How much driving do you plan on doing? The trailblazers fuel economy was dogshit when it was new and the last 20 years has not likely been kind to it.

As for reliability, I am not normally a GM/Chevy guy… But these are far from the worst and they actually were not bad. Saying that, it entirely depends on the maintenance history and if previous owners have taken care of it and even if it has been well taken care of it is still 20 years old and anything can happen at anytime.