Don't feel bad. At glance, that is the way it would appear to be, but its actually the opposite.
I've been on the phone, off and on all day, with Dynatech. So far, no solution. It's not looking good at this point. They asked me to measure my heads from side to side. I got 18 5/8" from passenger side head, at the header flange, to the drivers side head, at the header flange. They told me, they built the headers based on 18", which is stock head size.
If anyone out there reading this and has aftermarket aluminum heads, non-Edelbrock, can you please measure from the passenger side head to the drivers side head and see what measurement you get? This is with a SBC.
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