I’ve read that 67 p/s control valves are a 1/4" small nut, and they went to 5/16" in 68. What do I measure to see what I have? The outside diameter of the metal end of the hoses between the control valve and power piston are 5/16" but I can’t get a straight answer.
If the tubing OD that goes into the nut measures 5/16", you have the 5/16" fittings with 1/2" nuts. I believe only the early 67’s used the smaller 1/4" tubing with the small nuts.
Every 1967 small block has 1/4" fittings.
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That’s what I have on the car and am quite sure it’s the original control valve, even though I replaced the hoses back in the early 1980’s. The car is a late 67’ XR-7. There would’ve been no way I could’ve put the bigger hoses into the smaller unit, correct?
Correct - the later large hoses would not fit the small nut version of the control valve.
Thx.