427 CBB oil pressure

70RS/SS396 · 01-31-2012, 05:06 PM

Hi

I have a 427 cbb motor, 80s stocker built. L88 with stock L88 camshaft.

The motor have a stock GM modified oil pump (anti-cavitation grooves).

The oil pressure is very stable, about 18-20 psi at idle and then it goes up to about 42 psi when I hit the throttle. but then even If a run the motor in 7000 rpm I never have more then 42 psi oil pressure.

I run quaker state 20w50 mineral oil. Have also tried 15w40 mineral, but with no difference.

The motor ran straight 40 quaker state oil when it was raced in the 80s.

Is it safe to run this motor with the low pressure? with the 20w50 oil.

Thank You

01-31-2012, 05:06 PM	#1
70RS/SS396 Junior Member Join Date: Jul 2008 Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	427 CBB oil pressure Hi I have a 427 cbb motor, 80s stocker built. L88 with stock L88 camshaft. The motor have a stock GM modified oil pump (anti-cavitation grooves). The oil pressure is very stable, about 18-20 psi at idle and then it goes up to about 42 psi when I hit the throttle. but then even If a run the motor in 7000 rpm I never have more then 42 psi oil pressure. I run quaker state 20w50 mineral oil. Have also tried 15w40 mineral, but with no difference. The motor ran straight 40 quaker state oil when it was raced in the 80s. Is it safe to run this motor with the low pressure? with the 20w50 oil. Thank You