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I did see some Kendall GT-1 oils at my local Advance Auto Parts store, it was stocked in 10w30, 10w40 and 20w50 weights and all were rated as API "SL" . Does anyone know if these are any good?

Actually the ZDDP levels in Shell Rotella T drop a considerable amount from the CI-4 to the newer CJ-4 (triple protection stuff that is also rated "SM")!

1971 340 engine, bored .030" over with stock TRW forged pistons, stock short block overwise, stock 2.02" valve X heads, thin MP head gaskets so engine has 10.5 to 11.0 compression, MP .509" lift, 292 dur Hyd cam, Edelbrock TM5 single plane intake ( made before Torker was introduced), Holley...

1/4 mile : 12.953 @ 105.34 mph 1/8 mile : 8.280 @ 86.34 mph Through the mufflers with slicks on!! Bob