Re: Castrol GTX Magnatec for flat tappet break-in?
Cam Brake-in instructions that came with my crate engine states "Do not use synthetic oil for initial cam break-in".
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'64 C10 LWB, 283, 5speed
'68 C20 LWB, 327, 4speed
'69 C20 Custom Camper Longhorn, 350, 4speed
'72 C20 Cheyenne Super, 396, TH400
'66 C60, 292, 4speed
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