My flowmaster sheet says that the outside measurements tell the story. If the muffler case is 16" long then it is a 50 series. The 40 series is 13" long both are 4" thick and 9.75" wide. The 30 series is 17" long 10" wide and 5" thick. Hope this helps you out.
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66 Chevy C30 Stakebody Dump, PS,PB, 327cu in
71 Corvette Coupe 454 4 speed
79 Chevy 4X4 (Tom's old truck)
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66 Chevy C30 Stakebody Dump, PS,PB, 327cu in
71 Corvette Coupe 454 4 speed
69 Chevy C20 Custom Camper
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