COPO Feature
I have been reading a lot of posts from various web sites and in almost every instance there is a mention of the proportioning valve on the sub frame being an important feature. Is this a COPO feature or a BIG block SS feature or did they both have this.
When I renewed my brake system I took that system off because fo the condition ofthe valves and when with a more modern system, is this a major issue for value or minor compared to the drive line authenticity???
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