Re: Correct heater hose for 66
In 1966 GM manufactured Chevelles in six different plants*.
I'm sure each of those plants received heater hose on bulk spools and it was cut to length as needed.
In 1966, 446,633 Chevrolet A-bodies were built*. If each car's heater hoses were 3 feet long, 1,339,899 feet of each diameter were installed into cars.
I'd be surprised if every plant received the exact same hose from the exact same supplier several times throughout the production year.
A ribbed hose might mean it came from Gates, non ribbed hose might mean it came from Goodyear.
This is why I'm not a restorer.
* from chevellestuff.net.
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1971 Monte Carlo SS454-496ci 600hp
1999 Trans Am-500hp
2003 Iszu Ascender XL Limited V8