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Yes, and the old design was a poor one because of the proximity along much of the length of the oil lines to the exhaust and muffler. When I changed out my oem 76 exhaust for the ssi and old style lines I noticed a marked reduction in oil temps.
As I stated the problem with the S line is heat soak after the car is parked. The line should be insulated from the exhaust. The hard scavange line does return oil to the tank but you still want to reduce any heat load on the cooling that you can. Without a very large cooler and or very good air flow though it, the cooling is marginal for hd usage. I fought that battle for years. The older lines are a step in the right direction which entails marginal cost and no permanent modification to the chassis.
All I can comment on are what I have seen and what I would/did do to my car. Yes, I am always searcing for optimal solutions
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