Re: 8 RT Heads
8=1948, R=Rouge, as in Rouge plant, T=Truck. As Barry stated, different compression, read lower. Common misconception that the late (8BA) flathead came out in 49.
Not to argue with Barry, but I have a January '52 Truck Chassis Parts Manual that lists the parts number for 48-51 heads as 8BA and 52 (& 53) as 8RT.
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