[Tom Goldman]

Manley Severe Duty valves are available everywhere for under $30 each .
Cheap valves are just cheap to buy , when the head comes off one of the intakes and takes out your piston ,head and maybe the whole engine ,they aren't cheap anymore.
And yes ,I have personally been taught this lesson , more than once .
Don't take this as a knock, but most Bracket racers tend to believe lower spring pressures make the engine live longer , but nothing could be further from the truth .
Higher spring pressures help keep the valve from bouncing when closing , this especially true with a BBC intake valve.
Valve bounce causes most failures .