I could be wrong on the ID versus OD. I always thought hose was given in ID and tubing was given in OD because a 3/8 hose should fit over 3/8 tubing. Think fuel line in an old car. When the metal line transitions from hard line to rubber.
Either way, it sounds like you need to be working with -8 stuff for a 1/2 blowdown tube.
Chris
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1999 Formula 6spd (The driver)
1997 2500 Ext. Cab Dodge 4x4 CTD 5spd (The Earth Mover)
1970 Nova 5spd (The toy)
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