Re: really cool 70 Z28..simply the best.
I run valvoline racing VR1 10w30 oil and a bottle of comp cams break in lube in my 406 as per my builders recommendation. I've got one of the xtreme energy hydraulic flat tappet cams in it with the high ramp rates/spring pressures and he said that was the best prevention for wiping a cam lobe. As others have mentioned, I would not run a synthetic oil.
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Andy
1967 Camaro 406 4 speed
1969 C/10 383 5 speed
1969 D300 318 4 speed
1969 Super Bee 383 4 speed
1972 K/5 350 Turbo 350
1972 Duster 340 727
1974 'Cuda 340 4 speed
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