Small block confusion

the 89-91 LA engines roller lifters did not oil thru pushrods..oil thru shafts...in fact the lifters did not allow for oil thru pushrods..

the 92+ magnums oil thru the pushrods and the lifters had provisions to oil thru pushrods...

there was two separate part number for roller lifters....pre 92 and after 92....

but now there is only one part number which covers the magnum engines...and can be used in the LA roller motors...and if you have solid pushrods they wont oil...