P/N, 1st Stage Opening, 2nd Stage Opening, and any known 1st stage restriction
Holley Lists 3 now, down from 7 a while ago, down from 21 a long time ago.
125-206 12.5” Hg 5.5” Hg .028”, like the old Holley PN 2-4311 (later 25BP-475A-12)
125-207 10.5” Hg 5.0” Hg .021” like the old Holley PN 2-4312 (later 25BP-475A-25)
125-208 10.5” Hg 5.5” Hg .028”
Others
125-213, 11.5, 5.0
125-212, 12.0, 6.5
125-215, 10.5, 6.0
125-218, 11.0, 5.5 (23 means a 125-218 )
Holley had 21 total if you include the unlisted “24” we found lurking under the hood of an 83 Mustang 5.0 GLX
Examples:-There are date prefixes before the Holley 2 stage call number
A6-
7 Stock AMC 304 Motorcraft 2100 1.08 model 5.5
8 '85 Capri/Mustang 5.0 Holley 4180C stamped "8", means the 2nd stage would come in at 4.5
B1
8 Ford 460 F250 4X4 with 4180c come in at 4.5
13 On some IH 2300C truck carbs come in at 6.5
16 carbs with this PV come in at 6.5
23 = 1984 Capri/Mustang 5.0 Holley 4180C F1 23, or 125-218, 11.0, 5.5, but says it comes in at 6.5
24 = 83 Mustang 5.0 GLX 5.0 not on list
Standard rebuild Capri/Mustang 5.0 Holley 4180C 3-1346 kits = 10.5/6.5, no traditional stamping
MIKES Carburettor Parts Has 11or 12 generic Number:70-1000 2 Stage Power Valves
Napa offers a total of 8 diff. 2-stage power valves.
PN 2-4311 1st stage opens @ 9.0"Hg, 2nd stage @ 2.5"Hg 1st stage restriction .035
PN 2-4312 1st stage opens @ 10.5"Hg, 2nd stage @ 5.5"Hg 1st stage restr. .021
PN 2-4405 1st stage opens @ 9.0"Hg, 2nd stage @ 2.5" Hg 1st stage restr. .028
PN 2-4406 1st stage opens @ 10.5" Hg, 2nd stage @ 5.0"Hg 1st stage restr. .020
PN 2-4409 1st stage opens @ 11.0"Hg, 2nd stage @ 7.5"Hg 1st stage restr. .028
PN 2-4410 1st stage opens @ 10.5" Hg, 2nd stage @ 5.0"Hg 1st stage restr. .028
PN 2-4412 1st stage opens @ 11.0"Hg, 2nd stage @ 6.0"Hg 1st stage restr. .0225
PN 2-4413 1st stage opens @ 11.0"Hg, 2nd stage @ 7.0"Hg 1st stage restr. .024
Ford
had five Motorcraft 2150 2 Stage Power valves from 1974 to 1979. Since it has a wide range of crack off vacuums, I've listed them as Nominal so you can determine the pattern in power valve rank.
CE105 Nominal 7.0”Hg/ 2.0”Hg
CE120 , CE123 & CE122 Nominal 7.0”Hg/ 2.0”Hg
CE126 Nominal 10.0”Hg/ 3.5”Hg
CE130 Nominal 10.25”Hg/ 5.0”Hg
CE132 Nominal 10.25”Hg/ 6.0”Hg
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