03-20-2014, 04:37 PM
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CC Member
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Join Date: Jan 2008
Location: Nashville,
TN
Cobra Make, Engine: Backdraft, SBF 351w (463 CI)
Posts: 272
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Not Ranked
If the engine goes from pulling a vacuum to positive pressure it could blow out a seal in the engine. The Peterson pop off spring pressure is more for catastrophic failure then repeated positive pressure cycles. My knowledge is not from personal experience, its from my engine builder (He builds dry sump engines on a weekly basis).
I would consider cost of a spring cheap insurance. 
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