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I recently picked up a new pair of Promaxx aluminum heads for a 440 I'm assembling. It appears from their website the only spring selection was for hydraulic roller. The guy I bought them from said they were roller springs. I'm running a solid flat tappet cam, .552 lift. I really only run one or...

Recently I went to look at a worked set of 906 heads for sale. Some mild porting, larger valves, bronze guides, springs, etc and claimed to have less than 1000 miles on them. They did look to be low mile units and had been stored well. Just about when I was going to reach for my wallet I...

Is this unit one that would have come from a police car? I've not seen this before. For some reason I always thought certified speedos just had more gradients between the digits.