Where did you find the 1/4" thick spacer? Is it an open center design or four bores? I have a Blue Thunder with a 1/2" thick four bore phenolic spacer under my Demon thats just a wee bit too tall for me to get my engine screen on. With no spacer the carb linkage interferes with the manifold. A 1/4" would work though.
Some day a set of those CHI heads are going to be on my motor too. Very nice.
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