Re: MOTOR OIL
If your motor is built right and your clearances aren't super crazy loose you sure don't need 20-50.
I run Brad Penn 10-30 , on the dyno 20-50 cost 12hp versus the 5-20 I use during racing.
And those were Back to Back 180* oil temp and 160* water temp. So it's an apples to apples comparison.
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Tim Clary
68 RS/Z28
69 Olds Cutlass S
70 Chevelle SS LS6
70 AMX 390 Go-pack
71 Torino GT 429cj
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