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78 cutlass W-31 build

Discussion in 'G-Body Build Threads' started by Clutch, Apr 9, 2017.

  1. olds307 and 403

    olds307 and 403 Royal Smart Person

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    The baseplates are known to wear. Another issue on the better M4M 800 cfm carbs is the limited idle fuel. My Holley reman, which ran great for years and my 78 403 carb ran awful on my 9.5 to 1 Olds 350 with the small 204/214 cam. Crappy idle, just stumbled and ran shitty. I could have modified the idle tubes but instead I sent it to Everyday Performance about a year or so ago. It was around $250 for a custom tune using my core and no plating but did do the rear bushings, the front were OK. It ran so much better, no more idle screws 5 turns out. The idle was a touch rich, better than ridiculously lean. Since I changed the combo to 9 to 1 with more intake duration, it runs even better. I did make the APT adjustable on this carb, a thread in plug and notched the adjustment for a small flat screwdriver. I believe it is one full turn from where Ken set it, I gained at the track by setting it richer, it kills fuel mileage that is for sure. An easy adjustment, I may set it back again today. Just clean the hell out of it, did you get a new float? Sometimes you can get away with the old one, sometimes not so much.
     
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  2. Clutch

    Clutch Royal Smart Person

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    Yea I worked on G-BODYS when they were new lol I come from a car family it's all dyed off now but it was a good childhood I did my first overall paint job at like 12 I'm 44 now
     
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  3. Clutch

    Clutch Royal Smart Person

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    No I just got a kit maybe I should have but carb parts online can get confusing with kids running around Lauren had a sleepover lol 10 year old girls.. why do they still scream?
     
  4. olds307 and 403

    olds307 and 403 Royal Smart Person

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    My girls were actually very quiet till they were with their cousins or friends, then scream fest! Now they just hide and do their own thing, teenagers. The later carb used a smaller float and I got away many times not replacing them but everything wasn't ethanol fuel back then.
     
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  5. Clutch

    Clutch Royal Smart Person

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    Oh yeah the top plate for the radiator was in the bed of my truck sence the motor came out lol it got a little beat up
     
  6. MrSony

    MrSony Royal Smart Person

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    floats are cheap, just replace.
     
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  7. Clutch

    Clutch Royal Smart Person

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    Carb kit came today I may run up after work tomorrow and rip the carb off to get a jump on it. I'll see how I feel after work tomorrow 1499983504847595307546.jpg
     
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  8. Clutch

    Clutch Royal Smart Person

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    Not much to update the carb is off and here at home hopefully I get time to get it apart and get it in the dip today but idk I'm trying to stay clean for whatever Lauren wants to do today's her day with Dad she's 11 tomorrow
     
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  9. Clutch

    Clutch Royal Smart Person

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    Well my very long day is about over first thing this morning I hit tractor supply for lead connectors then we did Lauren's b-day seafood dinner and a boat ride followed up with ice cream I guess the salt air got to her and she fell asleep on the couch. I took that opportunity to get the carberetor apart ....wow it's ugly and dose not fit in my carb dip can??? I'm soaking all the small parts in the can tonight and I'll find something bigger with a lid to soak the main body, top, and bottom in tomorrow for now I'm just thinking rest for work tomorrow
     
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  10. Clutch

    Clutch Royal Smart Person

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    Got back to cleaning the carb tonight. Yuck!
    That's the worst q-jet i ever had apart I guess it's ethanol poisoning. Rust and corrosion I had to soak it just to get the Jets out the rods and tubes are green it's horrible but the bace plate it tight. I'll keep working at it hopefully it will be a carberetor by Saturday morning when I do the registration and trailer it home a friend of mine invited us to a BBQ pool party Saturday a few blocks away and I would love to drive it there
     
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