Oil pressure
 

Sbc 434 new engine 20/50 brad penn oil , what should be the max oil pressure cold ? 80 psi seems high to me. Any thoughts

Re: Oil pressure
 

My small block ford has 80 psi cold at idle around 1200 rpm, drops to around 65 to 70 psi warm. I am running a Melling high volume pump and 10/30 oil, what is your bearing clearance? in my experience 80 psi is not uncommon to see with a cold engine and a high volume pump in a small block with .002 bearing clearance. I have heard it said that you want to see 10 psi per 1000 rpm. Mine goes through the traps in the 7000 rpm range with about 85 psi.

Re: Oil pressure
 

Headsup 113

If you build your motors with ~.002-.0025" bearing clearance like I do my big blocks and use 20-50 oil,80 psi cold is about normal.
I always make sure that I throughly warm the oil before I rev it. Although I have never done it it's probably possible to blow out the oil filter gasket or o-ring if you rev it cold.

Re: Oil pressure
 

That does not seems too high with 20/50 cold.....

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Re: Oil pressure
 

Same oil in a 421 sbc and mine has always been 75-80 psi until it warms up.