Turbo head build

pishta said

You dont even need V8 springs as a turbo usually doesnt rev that high if you build it for full boost at midrange, ie a smaller turbo. Youll want a smallish turbo for a slant as the 225 wasn't really a revver with a 4.25 stroke. Turbos like to push on the rear gear so gear it low, like 2.93 or 3.23.

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Concerning the valve springs, the pressure on the port side of the valve spring needs to be considered on turbo engines. Take your max boost times the square inches of the intake valve to calculate what the pressure is in the intake port that is working to open the valve. I would add that amount to the open-closed pressure recommended by the camshaft supplier to get to the recommended spring valve pressure.
This will not be a huge change, but I see it as the correct way to select valve springs on an engine with boost.