Rfb, I looked into making a girdle for my twin turbo 400 project,not the halo type that the Ford boys use but a machined steel piece that bolts to the pan rails and over the top of the machined flat caps. I'm pretty certain that this would strenghten the bottom end of the block but I came to the conclusion that the amount of HP I wanted would break a cast crank anyway,probably sooner rather than later. I like you tend to make most of my own custom parts and have fitted a SBC electric water pump,I just fitted a flat ali plate where the original water pump was and bolted the electric pump to this plate(after a bit of grinding). It seems to work alright.
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