...a Genuine Holley single stage based on the old 1/2 the idle vac reading rule of thumb?
I found a list of the Walker parts and put them below to help out here.
Mr. Cook has posted about 2 stage PV's he's measured and likes to use that open at 10.5 and 6.5. I'm guessing those were genuine Holley though. Walker has a few that are close but none right at those specs.
Without wideband tuning am I likely to notice a difference between some of the ones that are pretty close like the 70-27 and the 70-50?
They seem kind of pricey ($22.00 or so each) to buy more than 2 to test with but I really want to try to give the 2 stage jobs a whirl to see if I like the results in my stock (less duals with an x pipe) '85. Oh, and it still sports the 4180c that at this point runs pretty good but has a single stage PV that came in the Holley 3-1346 rebuild kit.
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