Oil in the “heat passages” on BBC 360 heads

[AKguy]

I was surprised to find lots of oil in the passages between the #4 and #5 exhaust over to the intake manifold on both 360 heads. Should I be? Cracked heads? Blowing in from the exhaust stroke? Thanks.

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[fast 99]

Nothingburger, have seen that on engines from other manufacturers as well. It's just oil splash from the valley.

 

[AKguy]

Hmmmm, thanks.

 

[nvrenuf]

@AKguy was it liquid oil or carbon build up? That's an exhaust crossover for the choke or EGR, etc., I've seen carbon build up in there. Performance intake gaskets have a block off plate to help the intake stay cooler.

 

[Old Guy Bill]

Is the PCV system operational?

 

[AKguy]

@AKguy was it liquid oil or carbon build up? That's an exhaust crossover for the choke or EGR, etc., I've seen carbon build up in there. Performance intake gaskets have a block off plate to help the intake stay cooler.

Liquid oil.

 

[AKguy]

Is the PCV system operational?

Negative.

 

[Ricko1966]

Negative.

Get your PCV operational,it performs more good functions than most people realize.

 

[Craig Nedrow]

Like Rick said, an added is benefit is slightly more HP, for free. David Vizard did some interesting studies on that, plus helps with oil leaks.