I've never seen a small block with an extra bypass hose, just circulates through the heater. The big blocks had the bypass hose, so did my 6.5 Detroit Diesel.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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