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04-13-2009, 07:44 PM
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Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Engine builder says to use valvoline 20w50
I searched and nothing came up.
I’m not sure what weight to use, but I called three different machine shops and 2 said use Valvoline 20w50 and one said another said Castrol 20w50. They all said to use the comp cams oil additive with zddp. Is that too thin of oil? I give up. I’ve got 5 quarts of NAPA 20w50 (Valvoline) ready to go in with the comp cams oil additive. What are you running? You call any performance shops they want to sell you Joe Gibbs oil $$$. s/t
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. 
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