Yeees?
" vortec " is a title that GM uses on some of their engines
It has 275 hp.
Yes, it does.
A 3.4 liter GM engine is an interference type motor which has very tight tolerances. If the timing is off slightly, it can result in catastrophic failure.
The 4.3L V6 GM engine does not have a timing belt it has a chain, and it does not directly drive the distributor.
last cylinder on the passenger side
That engine is pushrod, it is the GM 3100 if I'm not mistaken. What are symptoms because bent valves are unlikely.
Some are, some aren't. We need to know which specific engine you are talking about.
That is the Vortec 4.6L motor by GM. Good motor, built off of the 5.7L technology.
The Vortec is the GM 4.3L VIN Code "W" engine, the X is the non-Vortec
The General Motors 3100 family of after 1996 underwent a changeover to interference designs. This standardized GM powertrains design across multiple platforms such as the 3400 and 3500.