i have a 390 8v motor, with the factory (60s) heavy-duty adj. rockerarm assys( NEW ). can i change cams to a roller set up with 400psi open psi Comp cam#magnum308r pn33782-9,or will i destroy my assys? do i have to upgrade?

at least get some end stands from POP and heavy duty shafts not sure on the rockers though

other tips? i really want to use my set-up. what is POPS phone# , or website??THANKS

ion. Does your setup have the compression and intake-head flow to take advantage of a mech-roller? Do you have a 4spd or stall converter with matching rear gear ratio?
Basic starting list;
You will need to verify clearance with the pistons, upgrade to a high quality timing chain set, use the harder Durabond cam bearings, dual springs with a minimum of 500 open (more would be better) 225-250 closed. Roller rocker assemblies with endstands. Quality hardened pushrods. JMO.

1964 Galaxie 500XL 458cid,med riser dual quad,mech roller cam,C-6 3500stall
1994 Mazda B4000
2004 Audi A6 Quattro S-Line
2003 VW GTI 1.8T
2003 Ford Excursion 4x4 enhanced 6.0 Powerstroke Diesel