Should look into milling that divider down 10-20mm. It made pretty good gains on the new Edlebrock manifold.
The Harrop is a totally different manifold to the Edelbrock AG with different runner layout which are shorter with less cross section (read: less volume) plus a smaller plenum.
Pretty dangerous suggesting to just copy what worked on the Edlebrock hi-rise dual plane may (and probably) won’t work on a low-rise dual.
The only reason Wayne milled out the divider was to correct the lean left bank (by balancing out the plenum pulses) which was determined with a fair amount of dyno time.
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