[tortuga]

So in poking around trying to get to the bottom of my 427/535 sbf, I've surmised that the valves have "umbrella" type valve seals as opposed to positive type seals which attach to the valve stem bosses vs riding on the valve stems.

Is this a fairly straight forward swap or do the heads need some machine work to fit the positive type seals? I am also thinking about doing this over the fender using compressed air to hold the valves while the springs are off?

Thanks
Steve H
SPF 1764