Boss 9 OE oil drainbacks

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Boss 9 OE oil drainbacks

Post  JBR-3 on November 12th 2017, 6:05 pm

In the OE Boss blocks, do the oil drainback passages essentially run through the coolant area into the valley,
or down into the crankcase ?

Also, my understanding is that the flow capacity of the original drainbacks was marginal, is this correct ?

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Re: Boss 9 OE oil drainbacks

Post  rmcomprandy on November 12th 2017, 6:26 pm

JBR-3 wrote:In the OE Boss blocks, do the oil drainback passages essentially run through the coolant area into the valley,
or down into the crankcase ?

Also, my understanding is that the flow capacity of the original drain-backs was marginal, is this correct ?

The OEM Boss 429 block oil drain-backs which I have seen are at a different location at the deck surface than a normal 385 series block. They go down to the crankcase in the rear and front cover area in the front.

I was told there are other versions of oil drain-backs in a Boss 429 block but, I have not seen what those might be.

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Re: Boss 9 OE oil drainbacks

Post  JBR-3 on November 12th 2017, 9:59 pm

Thanks Randy.

Any insight on the volume-of-drainback question ? I know it's tricky, oil volume depends on RPM.

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Re: Boss 9 OE oil drainbacks

Post  BOSS 429 on November 12th 2017, 10:14 pm

they can drain back a lot,there is no issue returning oil on a BOSS
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Re: Boss 9 OE oil drainbacks

Post  JBR-3 on November 13th 2017, 1:06 am

OK thanks Rich, it appears my impression was wrong.
Good to know.

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