spark plug recommendation (moving to Denver area)

[clintC]

I don't have any experience with higher elevation (in Ky now). I will be moving to south of Denver shortly. Fresh stock 350 (rv cam) will be "working hard" often times w/ loaded wood chips & pulling 5k chipper....do I want a 'hotter" or "cooler" plug

 

[Rusty Nail]

Voted no. It's fair to be concerned.
Check your underhood label.
AC Delco R43ts is OE I bet. Is middle of the heat range.

 

[clintC]

Voted no. It's fair to be concerned.
Check your underhood label.
AC Delco R43ts is OE I bet. Is middle of the heat range.

the only label left on this truck is "road hard and put up wet doing beyond what she was built for"....thanx for the suggestion, i was thinking R44ts, but stumbled across a feed that got me thinking wayyyyy more than I wanted to