87 318. Roller cam or not
If this 318 motor is original to the truck, Its probably has a Flat-Tappet cam installed. But the block will have the provisions for installing a Roller.
Trucks were late in switching over to Roller setups.
If it was a car motor, definitely roller.
Have a 86 Ramcharger factory 318, all original... Was a Flat tappet when I opened it up. But the block has the provisions for roller.