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Years ago I put a Holley 390 on a Rover 3.5L V8. It had vacuum secondaries and was mounted on an offenhauser dual plane manifold. The dual plane increased the gas velocity at low RPM thereby mitigating the effects of having the carb at the end of a long tube. At WOT the web for the dual plane did reduce total intake area but I never noticed it. The car was crazy fast ;-) MGB-GT!
That carb/manifold was a gem, easy to set up and very flexible.
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86 911 Race Car, with a few 993 bits in the boiler room
79 928 Race Car
88 928 Becoming a Race Car
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