Dig Posted September 30, 2018 Share Posted September 30, 2018 Is it okay to use 3/4" heater hose for the bypass between the water-pump and the thermostat housing on the straight 8 Buick? I just installed, and after a 30 minute drive it looked like the hose was swollen in the middle. Could be my imagination, but don't think so. Thanks. Link to comment Share on other sites More sharing options...
Ben Bruce aka First Born Posted September 30, 2018 Share Posted September 30, 2018 That is what I use on mine. Ben 1 Link to comment Share on other sites More sharing options...
jsmittie41 Posted October 16, 2018 Share Posted October 16, 2018 I can't remember what diameter the hose was on the 41 Special I used to own, but if the hose fits snugly onto the fittings the your OK in my opinion. What bothers me is that you think the hose is swelling, I'd keep a close eye on it. You wouldn't want a ruptured hose. Was the piece you used new? Good heater hose usually doesn't swell up. Jim 1 Link to comment Share on other sites More sharing options...
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