Thread: converting Holley vacum secondaries to mechanical!
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Old 11-15-2001, 04:03 PM
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Join Date: Jul 1999
Location: Prescott Valley, AZ
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FWIW, I have been playing around with my dual 1850 setup also, trying to tweak it a little. In the latest iteration, I have reduced the main jets to #60s, and have installed the stiffest springs Holley makes for the vacuum secondary diaphragms. This has provided the smoothest transition so far between primaries and secondaries. Not perfect yet, but the best so far. It still seems to be running just a little rich at low speed, and I'm thinking of trying to decrease the main jets one more size smaller to see if that helps. I have the small K&N filters, and I do notice a relatively large degradation with them installed versus without. I haven't seen any other options for air filters which will fit inside the ERA hood scoop, though, so I just keep cleaning them and live with the loss.
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