March 13, 2008First off, I know it's more common to go the other direction from what I've read, flat tappet to roller cam, but rollers are more expensive. And the truck will be a 100% trail truck driven on occasion.
The engine is a '91 GM 305 that came with a roller cam with roller lifters.
Can I use the older flat tappet lifters and cam instead of buying the more expensive roller lifters/cam set? If so, will the pushrod length need to be longer, because aren't roller lifters taller than flat tappet lifters?