CP'ers
For reference,
perhaps someone can use this someday.

For anyone who has converted their 65-70 B Body from front Drum to Disc, or even to Disc Disc, you know that unless buying a complete system or kit, finding the correct tube nut sizes takes a little research. Even on the same line size, apparently GM chose to have different front and rear system fittings to eliminate incorrect hook up on the assembly line.

To the best of my research, I've put together these 2 simple diagrams describing the tube nut sizes with standard colours you'll need if you plan on piecing together a system using the 71' and up style combination valve. The use of this style valve and master in "package" kits seems to be the standard today. It however can be daunting to find the valve that best suits your cars weight and balance, since hundreds of different combinations were probably manufactured. Anyone know the secret?

My combination is a 77-82 Corvette master. Delco #18M91. The combination valve is a CPP unit bought through Inline tube (PN PR-101). Described by them to be the correct choice for a Disc/Disc conversion on a larger car. Provides a 50/50 pressure balance...we'll see.

The master pictured is a Corvette style Delco Moraine unit typically used in conversions or kits. Used for illustration purposes only.

Napa part #'s;
1/2-20 x 1/4"   line = 641-3324
9/16-18 x 1/4" line = 641-3323
7/16-24 x 1/4" line = 641-3298

The colours may vary. Follow the sizes carefully.





Cheers, Mark