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Old 04-27-2011, 04:18 PM
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Blowby Crispies

I took off the passenger rocker cover from my 350 small block and found black sand like particles along the edge of the gasket and also starting to form inside the cylinder head. I knew I had some blowby as it was coming out the breather which I had installed on top of about a 10'' high tube to try to keep oil off the engine.

PCV valve may not be as effective as it should as this is a TPI engine with the wrong cam and vacuum drops off immediately upon acceleration.

I take it this blowby comes from the rings and is making its way to the cover with the breather as its the easiest place to flow to.

The block was rebuilt about 30 K miles ago and taken out of my last truck and left in the garage for a couple of years.
I then took it to a guy that does alot of high performance stuff and he recommended honing and new rings, bearings, cam, lifters. This was from a visual inspection.

I had asked originally to bore it out .060 but he persuaded me not to.

Is it rebuild time or time to change the cam and hopefully get better vacuum for the PCV system?

Can Specs: Comp CS 260H-10
Operating Range: 1200-5200 RPM
Duration Advertised: 260 Intake / 260 Exhaust
Duration @ .050'' Lift: 212 Intake / 212 Exhaust
Valve Lift w/1.5 Rockers: .440'' Intake / .440'' Exhaust
Lobe Separation Angle: 110
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