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Old 04-18-2009, 10:56 PM
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Broken Push Rod in BBC & Oil Leak

I found I had a broken and bent pushrod in my 461 on #2 intake and the cam lobe was ate up on #2 exhaust lobe. My question is, I have been looking thru Jegs & Summit and came across both 3/8" & 7/16" dia push rods for a BBC. The ones that were in my motor were only like 0.300". Can I use the 7/16" pushrods with guide plates or would it be better to go with the 3/8"? I need a strong pushrod for the 0.600+ lift cam. Iam also thinking about going with a different oil pump. The current pump must be a "high pressure" because the gauge says 80 psi idle cold and around 4k it will go to almost 100. I think this is too much pressure which is causing a leak somewhere. We took it to the track Friday and after about the 2nd run, they would'nt let us run anymore because it was leaking on the track. I can start it up in the garage and let it idle and it won't leak that I can see. It seems the only time it leaks is when you have some pretty good rpm's to it then the underside of the truck will be wet and dripping all over. Do you think if I went with just a standard pressure, hi volume pump would fix this problem? I already have the motor down for a rebuild.

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Old 04-18-2009, 11:29 PM
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For .600" lift I would step up the the big pushrods and big guide plates.
Bent pushrods indicate valvetrain interference. EG : VTP clearance.
60 to 80PSI @2000rpm+ is plenty. Oil leaks at the gaskets indicates not enough crank case ventilation, poor ring seal quality.
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