looking for a NOS Holley 1920 for a '72. tired of dealing with crappy rebuilds

As for me I had to get a '73 1920 since its the only year which will work for my '85 conversion any later('74 changed to holley 1945) or earlier wouldn't work because of my EGR system, but I got one As far as a never used NOS? not likely. Even if you do find a NOS they'll cost major.

IIRC correctly Slant Six Dan used to have a stack of NOS never opened never used H1920 including some very desirable economasters.... maybe send him a PM

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

I've got you covered, JDS, since I found a few more of those NOS 1920 Economasters I thought I ran out of when I put the "last" (not!) one on my '71 a few weeks ago. You've got a PM.

It is not quite true that "any 1920 from '73 down" will work correctly on a '72, BTW. The only ones that hook up and work all the way right are 1970 California, 1971-1972 Federal/California. The 1973 carbs will work if the EGR provisions are blocked off.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

i did buy one off e-bay that was never rebuilt, but it turned out to be an earlier 1920 and wouldn't work. so exactly how many versions of the H-1920 are floating around out there?

Off the top of my head:

1) 1962-1963 units without external choke pull-off (uses internal vacuum piston and pullrod instead), with pushrod-type bowl vent, with cam-driven accelerator pump
a) Without PCV provisions, with rod-operated throttle
b) With PCV provisions, with rod-operated throttle
c) Without PCV provisions, with cable-operated throttle
d) With PCV provisions, with cable operated throttle
e) Without PCV provisions, with cable-operated throttle, with manual choke (truck only)
f) With PCV provisions, with cable-operated throttle, with manual choke (truck only)

2) 1964-1967 units with external choke pull-off, with rotating-link bowl vent, with spring-driven accelerator pump, with PCV provisions
a) With rod-operated throttle, with Clean Air Package
b) With cable-operated throttle, with Clean Air Package
c) With rod-operated throttle, without Clean Air Package
d) With cable-operated throttle, without Clean Air Package
e) With cable-operated throttle, with manual choke (truck only)

3) 1968-1972 units, as per (2) but all in this group have revised cable-operated throttle lever and Clean Air Package
a) Without thermostatic air cleaner, without ducted bowl vent, with 1969 throttle plate anti-ice system
b) Without thermostatic air cleaner, without ducted bowl vent
c) With thermostatic air cleaner, without ducted bowl vent
d) With thermostatic air cleaner, with ducted bowl vent
e) With thermostatic air cleaner, with ducted bowl vent, with 1972 California emissions
f) With manual choke (truck only)

4) 1973 units, as per (3) but all in this group have ducted bowl vent and venturi vacuum tap for EGR operation
a) With California emissions
b) With Federal/Canada emissions
c) With manual choke (truck only)

5) Late 1970s/early 1980s Economaster units offered by Holley as new replacements for older applications
a) To replace any automatic-choke carburetor in group (1) or (2)
b) To replace any automatic-choke carburetor in group (3)
c) To replace any automatic-choke carburetor in group (4)

So, that's twenty-three significant variants, not counting the more minor differences that can affect engine running quality but do not affect interchangeability.

Carter BBS variant proliferation was similar, and divided along similar years.

The Economaster carburetors incorporate an annular-discharge, star-booster venturi, a larger idle-transfer slot, a gradient/multistage power valve, a relocated PCV dumpout, and other engineering changes designed for more precise control over the fuel-air mixture, more optimal fuel/air mix consistency to the six cylinders, and overall better fuel economy without creating driveability problems. And, judging by the results of installing a NOS "5b" unit (per my list above) on my 1971 Dart...these changes actually work.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

so looks like a 5b is what i need....thanks!

Yep...and that's what I have!

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一期一会
Too many people who were born on third base actually believe they've hit a triple.