356 Grind, GX390 Big Block,Tool Steel Billet, Clone

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$179.95
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Description

  • Tool Steel Billet cores are the best choice in high RPM applications.
  • The two piece design of the Tool Steel Billet core allows you to advance or retard the cam to meet your application needs.

 

Specs

Engine: 390cc OHV Clone 13HP
Recommended Class: Modified / Open
Target (MAX) RPM: 7600-7800
Spring Pressure (In / Ex): 65 lbs Dual Spring
Valve Lash (In/Ex): .003"
Ignition Timining: Pump Gas Not Recommended
  110 Octane 34 Deg BTDC
  Methanol 38 Deg BTDC
Compression Ratio: 12.5 to 1 or Higher

 

Profile

  Intake Exhaust
Open: 51.6 BTDC 94.0 BBDC
Close: 93.5 ABDC 54.8 ATDC
Lift: .3555" .3555"
C/L: 108.0 ATDC 108.0 BTDC
DUR @ 50: 254.3 Deg 254.5 Deg