After my guy at Sanels told me that my head (for the truck) is in excellent shape (he did a beautiful job), he showed me a report from AERA dated 1994 I believe. Apparently these engines are noted for having the head bolts loosen. I was fortunate in that as soon as it happened I stopped driving it and prevented any further damage but what a sucky thing ha? Now I'm gonna always think of that. I got conflicting advice from everyone I talked to about whether I should replace the head bolts or not but in the end I went with my guy at Sanels who said "If it was me, I would". Good enough for me...the guys a genious in the shop.