1991 Pontiac Grand Prix timing belt on a 3.4L

I recently asked the question on why my car wouldn't start and I figured it out. I stripped the timing belt out on my 91 Grand Prix GTP 3.4L and my question now is, is the early 90s 3.4L v6 an inteference engine? I have talked to a few others online and one said it is but three others said the years 91 to 95 where not considered intereference motors. I would have done a leak down test but I do not have the tool to screw into the spark plug hole. But I will do a compression test to see if i bent a valve but til then i need to know if the engine is interference or not any information would be greatly appriciated
Thank you, Greg