Depending on the application some 283's did not have the heat riser, I was surprised to find mine did not have it from the factory. 1957 2 ton Low Cab Forward, 283, single exhaust.
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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