360 SB dual throttle return spring question

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    Author Topic: 360 SB dual throttle return spring question  (Read 1148 times)

    Offline 360FISH

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    • BS23H3B567746
    360 SB dual throttle return spring question
    « on: April 22, 2014 - 04:57:53 PM »
    Hey guys…  The Fish made it through a 1300 mile journey last week with just a leak of tranny fluid (not too bad)…  however in the last 10 miles of the trip I had a stuck throttle.

    Turns out the return spring broke. 

    I found both ends so I have what it looked like (one end was anchored a bolt on the manifold, the other sprang back to sit near the distributor), but I’m thinking of going with a dual spring setup.  I’m running the standard Holley throttle linkage and have an Edelbrock RPM manifold on my 360 SB.

    Any easy answers here on the right bracket and spring set to get?

    Thanks

    Alan
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    1973 ‘Cuda   Semi-Pro Touring
    360 SB - 518/OD auto tranny - FAST EZ EFI - Edelbrock Fuel sump - HHR fan
    Hella H4 headlights on relays - 97 Dodge Avenger seats - Chin spoiler - Bumpers pulled in to ’72 offset

    Build: http://www.cuda-challenger.com/cc/index.php?topic=74674.0


    Offline cudabob496

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    Re: 360 SB dual throttle return spring question
    « Reply #1 on: April 22, 2014 - 09:42:43 PM »
    don't know, but running without a dual return spring could be deadly.
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    72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

    1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

    2011 Kawasaki Z1000

    Offline Chryco Psycho

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    • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
    Re: 360 SB dual throttle return spring question
    « Reply #2 on: April 22, 2014 - 11:15:40 PM »
    I often run backwards make or buy a bracket that mounts to the rear carb bolts & run the springs back towards the dist , ALWAYS run 2 springs
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    Challenger - You`ll wish You Hadn`t

    Offline cudabob496

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    Re: 360 SB dual throttle return spring question
    « Reply #3 on: April 23, 2014 - 02:20:18 AM »
    I've got a double spring pulling towards the firewall, and a single
    pulling towards the radiator.  3 should be good enough!
    Logged
    72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

    1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

    2011 Kawasaki Z1000

    Offline CUDA JAS

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    Re: 360 SB dual throttle return spring question
    « Reply #4 on: April 23, 2014 - 08:48:49 AM »
    Quote from: cudabob496 on April 23, 2014 - 02:20:18 AM
    I've got a double spring pulling towards the firewall, and a single
    pulling towards the radiator.  3 should be good enough!


    Wow how is the pedal feel on that???

    Summit has some nice aftermarket brackets that bolt to the carb base.

    He is a pic of what I run...



    Although I now run a newer black spring...looks much nicer!!!

    Jason
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    74 'cuda 360/727



    Gearhead: car nut, automotive enthusiast, one who loves hot rods, muscle cars, hot trucks, burnin' rubber and neck snapping performance. 

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    Offline cudabob496

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    Re: 360 SB dual throttle return spring question
    « Reply #5 on: April 24, 2014 - 10:14:10 PM »
    Quote from: CUDA JAS on April 23, 2014 - 08:48:49 AM
    Wow how is the pedal feel on that???

    Summit has some nice aftermarket brackets that bolt to the carb base.

    He is a pic of what I run...



    Although I now run a newer black spring...looks much nicer!!!

    Jason


    The double spring was from Summit, but it weakens over time. The third spring is from a hardware store, and it's just
    strong enough to return the throttle to off, if the double spring combo broke. So, pedal is not too hard.
    Logged
    72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

    1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

    2011 Kawasaki Z1000

    Offline 360FISH

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    Re: 360 SB dual throttle return spring question
    « Reply #6 on: April 25, 2014 - 01:07:20 PM »
    I can just see it now...  5 springs!    :bananasmi

    Thanks guys...  I'll figure something out...  I'm reading by some that having the springs pull toward the front offsets torquing the "rod"(what ever you call the part the mechanism is rotating on) takes being pulled back by the throttle... 

    I guess the bottomline is that one spring is a bad idea.   :22yikes:

    Logged
    1973 ‘Cuda   Semi-Pro Touring
    360 SB - 518/OD auto tranny - FAST EZ EFI - Edelbrock Fuel sump - HHR fan
    Hella H4 headlights on relays - 97 Dodge Avenger seats - Chin spoiler - Bumpers pulled in to ’72 offset

    Build: http://www.cuda-challenger.com/cc/index.php?topic=74674.0
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