R-100 4X4

Much better now, got plenty of room on both sides ..

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496" stroker motor is going together slowly ...

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Oil scraper going to take awhile to be fitted ...

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One more oil control item that's on order and the oil pan can be locked down for the long ride ..

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Designed to stop oil from climbing up the back of the oil pan under hard acceleration, and foaming due to contact with the rotating assembly,
 
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A lifter valley pan is a metal shield that sits between the engine block and the intake manifold to keep oil from splashing onto the bottom of the manifold.

This helps to prevent oil from coking and burning, which can create sludge that falls back into the engine.
It also keeps the intake manifold cooler by blocking the heat from the hot oil, which can slightly improve performance by reducing intake charge temperature.
We was thinking of running a air gap intake, but found a intake that's more suited for the PP heads ..
Since it doesn't have the means to keep hot oil off the intake, the valley pan will act somewhat like a air gap ..
Core functions of the lifter valley pan
  • Keeps the intake charge cooler: The pan acts as a thermal barrier, preventing hot oil splashing up from the lifter valley from heating the intake manifold. Cooler intake air is denser, leading to a more powerful air-fuel mixture.
  • Reduces oil coking: Many older big-block Chevy engines feature an exhaust gas crossover in the intake manifold, which can reach temperatures of 400-450°F. Oil splashing onto this hot surface will burn, creating hardened deposits (coke) that can break off and enter the oil system. The pan prevents this contamination.
  • Seals the lifter valley: The pan, typically a steel stamping, also acts as an intake gasket for the lifter valley, ensuring a proper seal. This prevents oil from coming up and leaking from the intake manifold.
  • Directs oil flow: In some gasket designs, the pan also helps to maximize lubrication by directing oil splash back down onto the camshaft and lifters.
  • Minimizes oil aeration: By blocking oil from splashing violently onto the rotating assembly, such as the crankshaft, the pan can help reduce oil aeration (the mixing of air with oil), which protects engine components.

Modern vs. classic applications
  • With exhaust crossover: If your big block uses a stock cast-iron intake manifold with a functional exhaust gas crossover, the valley pan is essential to prevent oil from coking and contaminating the engine.
  • With aftermarket intakes: If you install an aftermarket aluminum intake manifold that does not have a heat crossover, some builders will omit the pan. While the risk of oil coking is eliminated, using a pan or baffle can still provide the benefits of a cooler intake charge and reduced oil aeration.
 
Not so much just a BBC thingy, lots of car manufacturers used it on their bone stock motors ...

Pontiac comes to mind .. (350, 389, 400, 455, etc.)
On LS V8 engines, a lifter valley cover, or pan, is a standard component.

Also Mopar; like the 383 and 440, used a metal valley pan that also served as the intake manifold gasket. This design kept the intake manifold "dry" by isolating it from the hot oil below, allowing for a cooler air charge.

AMC V8s: These engines also featured a valley pan design. It is installed before the intake manifold and functions as the gasket to seal the lifter valley.
 
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