427 CBB oil pressure

[Alan Roehrich]

Originally Posted by 70RS/SS396

Hi

No the engine has the same oil pressure as before (in the 80s, when it was raced in stock eliminator).
I know the engine has ALOT of 1/4mile runs with this oil pump and pressure. So it sould be fine. Talked to the builder of the engine and he modified the pump to have this low oil pressure. He drove QS w40 oil, he tried thinner oil, but he had some problem with the puchrods went thrue rockers when he rew 7400+ rpm. But with the w40 oil it was OK.

But when I talk to people now all say, change the pump....you need more pressure....7-10 psi / 1000rpm.

So I dont know what to do

Unless the rockers are turning blue, the pushrods did not go through the rockers due to oil weight. If they did turn blue, there are probably a pair of oil flow restrictors in the back of the block, take them out and throw them in the garbage, put a pair of pipe plugs in the block in their place. Then put a good oil pump in the engine with a 70 psi relief spring. I'd put a high volume pump in it with anti-cavitation slots, but that's just me. Then you could probably run a decent 10W30 racing oil and be just fine.

Why didn't you say the oil pump was intentionally modified in the first post? It would have saved a ton of time and effort.