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347 Stroker Small Block Ford Valvesprings

The Z304 heads featured M-6513-BH beehive springs designed to provide 130 pounds of seat pressure (at 1.800 installed height) and 293 pounds of open pressure. The springs allowed over 0.650 lift, which was more than enough for our Z303 cam.
475hp 347 Stroker Ford Small Block - Catching Zzzzs

 The Z304 heads featured M-6513-BH beehive springs designed to provide 130 pounds of seat pressure (at 1.800 installed height) and 293 pounds of open pressure. The springs allowed over 0.650 lift, which was more than enough for our Z303 cam.  View Related Article

 

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