Chrysler changed to roller rockers in '90 for the 3.0L Caravan engines. The Montero/Raider 3.0L engines had roller rockers from the beginning in '89. So, as long as you have '90+ Caravan heads, there should be no difference in the valve train - just swap some Montero/Raider cams into the Caravan heads.... but at least check the cam bore clearances.

You may need a couple of longer bolts for the valve covers.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum