Converting to vortec heads!?

Question

does anyone know the modifications involved in converting to newer style vortec heads on my 1989 silverado 350? or is it just a direct replacement? and also anyone have any idea how much horsepower i would gain from this? thanks

Answer 1

Your best bet is to have your heads reworked, the 500 bucks you will spend on parts and labor for bigger valves, milling the heads .015-.030" and gasket match port work would give you better preformance than vortec heads. Milling the heads alone is worth at least 30-40 hp(adds compression) are you still running the stock TBI setup?

Answer 2

Won't work without the vortec fuel injection system and intake manifold. Most likely would be a power LOSS.