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I get what you are saying about the odd pairing of adjacent cylinders
This is the layout of Kent's Scatter Pattern Cam, it has siamesed inlets & the centre cylinders are siamesed too, so it has similar problems as a Twin SU B20.
Inlet Cylinders 1 & 4 LCA = 104°
Inlet Cylinders 2 & 3 LCA = 98°
Exhaust Cylinders 2 & 3 LCA = 102°
Exhaust Cylinders 1 & 4 LCA = 108°
If forced to use twin SU's when racing, I would definitely use a scatter pattern for the lobe centres.
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Three 164's, Two 144's, One 142 & a partridge in a pear tree.
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