Re: 66-67 Hemi Carburetor jetting for stock motor
[Re: dragon slayer]
#2934087
06/16/21 10:11 PM
06/16/21 10:11 PM
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Joined: Jan 2003
Posts: 571 Denver,NC
hemiheadNC
mopar
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mopar
Joined: Jan 2003
Posts: 571
Denver,NC
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...on my 66 I used the Edelbrock600 cfm ( 1406 ?) jetting and metering rods on the primary carb. Get instruction manual and follow the adjusting flow chart for rich/lean power/idle , it depends on what cam and compression you run. I left the secondary carb be.Your results may vary ....
I'm lost in the 60's and DAMN proud of it.
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Re: 66-67 Hemi Carburetor jetting for stock motor
[Re: ph23vo]
#2934295
06/17/21 04:24 PM
06/17/21 04:24 PM
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Joined: Mar 2007
Posts: 3,141 tennessee,usa
mattsmopars
master
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master
Joined: Mar 2007
Posts: 3,141
tennessee,usa
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my stone stock 66 hemi car..ran perfectly with stock jetting and rods....but it was obv a tad lean WOT as the car ran faster at the drags in warmer air temps...
biggest difference i made was by modifying carbs was to lighten the air doors....car went from mid 14's @ 99 to low low low 13's @ 105 mph with no othr changes.. Just curious , but what type of modification was used? Matt
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Re: 66-67 Hemi Carburetor jetting for stock motor
[Re: mattsmopars]
#2934321
06/17/21 05:50 PM
06/17/21 05:50 PM
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Joined: Aug 2003
Posts: 43,251 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,251
Bend,OR USA
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Some racers cut weight off of the door weights, we out 5/16 nuts under the weights to hold them partially open to start with so they would open quicker on the starting line Some of the S.S. racers would use thin diameter rubber tubing to hold the doors open in the pits and remove the tubing after the run before getting near the time slip booth or any of the techs Lots of different ways to make them old cars go faster
Last edited by Cab_Burge; 06/18/21 12:04 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 66-67 Hemi Carburetor jetting for stock motor
[Re: Cab_Burge]
#2934383
06/17/21 09:45 PM
06/17/21 09:45 PM
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Joined: Jun 2014
Posts: 1,331 VA
dragon slayer
OP
pro stock
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OP
pro stock
Joined: Jun 2014
Posts: 1,331
VA
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I use to help a couple and later ran a Hemi in NHRA stock class back in the 1970s, I remember the jetting being the same on all the street hemi carbs from 1966 to 1971 The first car we raced (1969 GTX)had a 1968 Street Hemi out of a non CA wrecked Roadrunner in it, it ran faster with open headers with one jet size bigger in all eight jets, we never leaned it down after that No sorry. The Carb where constantly modified and the early 66-67 carbs are pre emission and nothing like the 68 and up carbs. Venturi bleeds, jetting and meter rods all changed. Plus what you did racing in 1970 with 1970 fuel may not equate to what a stock car needs today. I am going to go with stock set up, but was just curious if anyone did actual testing with the early carbs since they are significantly different then the 68 and up ones. I read Jims details on what he did with his 68 carbs.
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Re: 66-67 Hemi Carburetor jetting for stock motor
[Re: dragon slayer]
#2934500
06/18/21 11:20 AM
06/18/21 11:20 AM
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Joined: Aug 2003
Posts: 43,251 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,251
Bend,OR USA
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I've check several original FSM manuals on the jetting, they showed the same rods and jets in the 1966 automatic carbs as the 1970 motor automatic carbs had Your correct on Carter making other changes to the carbs for Mopar due to emissions and other reasons I don't know about and maybe Mopar didn't update the jets and rod Carter part numbers in the FSM manuals but I doubt that
Last edited by Cab_Burge; 06/19/21 12:15 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 66-67 Hemi Carburetor jetting for stock motor
[Re: cudaman1969]
#2934965
06/20/21 06:50 AM
06/20/21 06:50 AM
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Joined: Jun 2014
Posts: 1,331 VA
dragon slayer
OP
pro stock
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OP
pro stock
Joined: Jun 2014
Posts: 1,331
VA
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Here is what the Mopar kit for your Vanke mod instructions had/did: Notice the rear carb changes besides the venturis.
Use primary venturi 58-902 and 903 Use pump shooter 48-294 (.035”) with pump link in long stroke position Use needle and seat 25-861 (.110) Velocity valves blocked open
Rear carb Jet 4140 Location Pump side Opposite pump side Primary 120-159 (.089”) 120-404 (.104”) Secondary 120-159 (.089”) 120-404 (.104”) Meter Rod 16-440 (.0665 x .058) 16-136 (.071 x .061)
Front carb 4139 Location Pump side Opposite pump side Primary 120-404 (.104”) 120-404 (.104”) Secondary 120-171 (.1065”) 120-395 (.095”) Meter Rod 16-136 (.071 x .061) 16-136 (.071 x .061)
What they came with stock 4139 uses the 58-942/3 primary and 58-347/8 secondary venturi 4140 uses the 58-946/7 primary and 58-678/348 secondary venturi 48-264 pump (.028) both carbs 25-860 seats (.1015)
Last edited by dragon slayer; 06/20/21 06:51 AM.
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Re: 66-67 Hemi Carburetor jetting for stock motor
[Re: dragon slayer]
#2935022
06/20/21 11:42 AM
06/20/21 11:42 AM
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Joined: Aug 2003
Posts: 43,251 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,251
Bend,OR USA
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Cab you once made a snide remark about not reading technical manuals...I have the Carter books, and I have the FSM. So I think you need to go back and look at those FSM.
I think my remark was about Chilton, Motors and other automotive service manuals specs, Not about the original F.S.M. manuals On your deal you need to test, test and retest to get the best jetting for your carbs. using the fuel sold in your area I had one set of 1966 or 1967 visually modified Hemi carbs that ran better than any other set we had, I traded them off to a guy who had a set of 1970 Hemi carbs on his 1966 or 1967 Hemi GTX because NHRA back then, 1973/1974, require us to have the factory carbs on the cars we raced in both Stock and Super Stock. I was racing a 1970 Baracuda back then with a 426 Street Hemi motor in it (not a original car)and had been tossed out by NHRA tech due to having a intake manifold that had been bead blasted inside at the 1975 Winternationals I had thrashed to get the car put together in November and December of 1974 and knew it was illegal but forgot to change it before going to Pomona for the 1975 Winternationals
Last edited by Cab_Burge; 06/20/21 11:44 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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