My dad bought the truck new and had the head off and rebuilt along with rings at about 40,000.

I inherited the truck when he passed and have been keeping it going over the years. The #3 cylinder had valve seat problems three times since then. Last year I put a new forklift head on it and it’s gone about a year and now #1 cylinder is dead. I haven’t torn into it yet, but it’s definitely a head/valve issue and I’m done with this engine. I am an expert at pulling and replacing this shitty aluminum head.