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Boss 9 OE oil drainbacks

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

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Last edited by JBR-3 on September 20th 2020, 1:38 pm; edited 1 time in total (Reason for editing : .)

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

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Last edited by JBR-3 on September 20th 2020, 1:39 pm; edited 1 time in total (Reason for editing : .)

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

they can drain back a lot,there is no issue returning oil on a BOSS
BOSS 429
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Post  JBR-3 November 13th 2017, 1:06 am

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Last edited by JBR-3 on September 20th 2020, 1:39 pm; edited 1 time in total (Reason for editing : .)

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