Purple Shaft 280/280 cam

Yes, stock heads just pocket ported.

If I choose a hydraulic cam, with up to .470" lift, the stock rocker arms would break. A friend of mine have a 280/474 cam and his rocker arms were breaking everytime, so he had to buy roller rockers. If I need to buy a set of roller rockers, I prefer to use a mechanical cam, it has more power and idles much better than the hydraulic one. The guy who will build my engine uses the 284/528 in one of his cars and recommends it a lot.