Proportioning valve vs. Hold off valve

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Mar 7, 2013 | 07:35 AM

Mike H.

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Joined: Sep 2010

Posts: 162

From: Damascus, OR

Proportioning valve vs. Hold off valve

In '68, the GM model cars used the round hold-off mounted to the diaphragm. Now the standard is the brass proportioning/distribution valve. Is one safer than the other?
Mike

Mar 7, 2013 | 09:22 AM

joe_padavano

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Joined: Mar 2007

Posts: 50,539

From: Northern VA

Quote:

Originally Posted by Mike H.

In '68, the GM model cars used the round hold-off mounted to the diaphragm. Now the standard is the brass proportioning/distribution valve. Is one safer than the other?
Mike

No, just different. GM went to the all-in-one combo valve to reduce part count and save cost.