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Re: Importance of a proper tune.
They are CNC ported 305 vortec castings with 1.94 intake valves and 1.6 exhaust.
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1995 Silverado - 198k mile short block, hand ported vortec heads, 4L80E, efans, LT4 Hot Cam, Rear disc brake conversion w/drilled and slotted rotors
1999 NBS Silverdo - Phoenix Gold 6.5" components no amp stock HU 
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