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Old 04-12-2012, 11:31 AM
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1985 chevy 350

Does anyone know if I changed a camshsft, lifters , and springs in my sons 1985 chevy 350 truck, from stock to .454/.454 lift 216 duration. Can I use regular pennsoil 10w30 oil with an oil additive with zddp? Also, how much additive do we need to add to his 4 quarts of oil? Thanks

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Old 04-12-2012, 04:31 PM
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What kind of additive is it? Whats the brand name?
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Old 04-13-2012, 08:21 AM
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1985 chevy 350

I found cheapy STP at the local auto parts, its the only one that says it has zinc and zddp. Or should we order crane or comp brand etc... Also how much do we add? Do we subtract the amount of additive to give us back the total of 4 qts or so required for our 350?
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Old 04-13-2012, 02:50 PM
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If your referring to STP oil treatment pour the whole bottle in there.
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Old 04-13-2012, 05:34 PM
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1985 chevy 350

So STP oil treatment has enough additive for the break in on the cam and lifters?
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Old 04-13-2012, 08:28 PM
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If you don't feel safe using it, and going by the off and on answers I find online, just go to your local GM dealer and get the cam break in lube.
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Old 04-14-2012, 07:12 AM
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My new cam came with some black-colored lube (more like grease) that I put on the cam lobes. My cam docs also recommended special lube on the lifters where they contact the cam, and I bought it from Summit when I got the cam. Its red syrupy stuff that is much thicker than oil. I think I also got some stuff to add to the oil during break-in.

I would stick with using lubricants that are specifically recommended for cam break-in. They aren't that expensive and it beats screwing up the cam during break-in.

I've also found that the parts stores carry Mobil 1 in 10w40 (for diesel) and 15w50 (for classic cars) that has the ZDDP you need. Its easier for me to find Mobil 1 on sale than the Valvoline racing oil or the Royal Purple that many folks use.

By the way, your 350 should use 5 quarts total, not 4.

Bruce
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