Gpc1

Hi,
ive got a 70 350 motor #8 heads it has 60 psi oil pressure, seems high unless it has a high volume pump?
seeking opinions thanks
Greg

joe_padavano

60 psi when? At idle? At 4000 RPM? Hot? Cold? 60 psi cold is nothing to worry about.

Gpc1

On start up and doesn’t change much after warming up rpm doesn’t change it much either I thought it should be about 30
i bought this motor used it is rebuilt and runs nice I guess it’s a real good one then.

oldcutlass

What is it after its been driven for 1/2 hour to 45 mins?

olds 307 and 403

Exactly, it should drop significantly at operating temperature. My stock 76 bottom end hits 75 psi cold. I would try another gauge and or a sender. And your motor is probably a 73 to 76 motor, same casting number.

Gpc1

I haven’t been able to actually road test this car yet. Ogden Chrome still has my bumpers. 15 weeks now but that’s another story. I ran it about an hour and the oil pressure came down to 40. Double checked with another guage and exactly the same.
Im fairly certain the block is a 70. Stamp on oil filler tube indicated 70. I will verify the number on the block just so I know
for sure. Thanks

OLDSter Ralph

I think you are in a good oil pressure range. When you "balloon" or explode oil filters, then you do have a problem.

Sugar Bear

Numbers sound in range, high viscosity oil will affect pressure. What weight are you using?

Good luck!!!