![]() ![]() If the Intake Duration is over 290 advertized Duration, I would be concerned. Piston and Cam Mfgr's design their products to Fit Stock OEM Engine Specs and you should not have to worry about Valve to Piston Clearances when the Cam is installed per Mfgrs Specs and you have not modified OEM Specs of the Engine. The Longer the Duration the Closer the Clearance. Valve to Piston Clearance is more dependent on Cam Duration not so much as lift. 050" as you indicate) I get approx an 8:1 DCR which is nice for Pump Gas - Good Choice of Cam However, Considering the Costs of the HR, I would sooner go SR Cam. Using the Lunati 60211 HR Cam 272/280 Advertized Duration (NOT. Kelley's DCR Calculator I get a 9.7:1 Static Compression. 060 = 4.31 Bore, 781's have an 118cc chamber (Always CC BBC Heads as the chamber volume or known to vary), P2465F-060 + 18.0cc, Steel Shim Gasket is approx. ![]()
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