Got it running

Discussion in 'Race 400/430/455' started by BuickGSrules, Apr 23, 2021.

  1. BuickGSrules

    BuickGSrules Gold Level Contributor

    Got the new motor running today, been a project over some years. A lot of screw ups from the guy I got it from, had to have a new crank made and ended up doing final machine work myself because of inexperienced machine shops over here. A lot of hours of reading about all you experienced guys recommendations and lots of phone calls to my teacher/mentor Gary Paine - without him and his knowledge I would have screwed up. I have been building several hot street motors but this is different and time will tell if I have made the right decisions and my measurements are correct, LOL. If I could go 4 years back I would start over with a Tomahawk instead. Now we just need some open borders so we can go to Sweden and see if I can run with the Big guys in the 10.5” Outlaw class.
     

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    1nastygs, Ken Mild, MRP and 6 others like this.
  2. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    Congrats! What’s the engine combo?
     
  3. BuickGSrules

    BuickGSrules Gold Level Contributor

    Just a 494
     
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  4. Houmark

    Houmark Well-Known Member

    Have you ever considered running turbo or procharger? Or are there rules against that?
     
  5. GS Kubisch

    GS Kubisch THE "CUT-UP" BUICK

    Love that car!

    Good luck Jan.
     
    BuickGSrules likes this.
  6. sriley531

    sriley531 M.M.O.G.

    Such a bad a** car Jan, I always enjoy your updates.
     
    BuickGSrules likes this.
  7. BuickGSrules

    BuickGSrules Gold Level Contributor

    My pocket aint deep enough for going turbo and dont want to mess with all those sensors and electronic stuff. I am a NA guy but are forced to use a power adder now for trying to run the class I wanna run. This season will tell if my little 494 can run with the 555,598,632’s the others in the class run.
     
  8. FireRedGS455

    FireRedGS455 Well-Known Member

    Congrats Jan. Awesome.
     
  9. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    What’s the details on the build?
     
  10. BuickGSrules

    BuickGSrules Gold Level Contributor

    13-1 comp, stg2 that flows upper 370’s, GRP rods, custom solid roller around 700 lift, Jesel rockers, all tricks done to block with girdles, ported Wildcat intake, right now it has a Precision 1050 Dom but I have a 1150 ready, SRE pan, Peterson oil pump, GZ vacuum pump, custom Lemons headers. If I could go 3 years back I would have had a Velasco crank done for it instead of stock.
     
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  11. OHC JOE

    OHC JOE Mullet Mafia since 2020

    Looks awesome Jan
     
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  12. 69GS430/TKX

    69GS430/TKX Silver Level contributor

    Super car, Jan. You did a great job. I have a question about your engine: With such a high compression ratio, how do you prevent dieseling (after-run) when you shut off the motor? (Asking for a friend...well not really, I am asking for myself, because my engine has this problem big-time) :)
     
    BuickGSrules likes this.
  13. dan zepnick

    dan zepnick Well-Known Member

    Thats one badass car Jan. Glad to see you kept it. Can't wait to hear how it runs!
     
    BuickGSrules likes this.
  14. Buicksky

    Buicksky Silver Level contributor

    Jan Good luck! have a great season!
     
    BuickGSrules likes this.
  15. BuickGSrules

    BuickGSrules Gold Level Contributor

    I have not tried it yet so maybe someone can chime in? The old motor I ran 12.8-1 and never had a problem.
     
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  16. standup 69

    standup 69 standup69

    That has nothing to do with run on ...you have a hot spot somewhere in the chamber ..too hot plug or sharp edge glowing hot giving it an alternative IGN source ..
     
    Mark Demko, 69GS430/TKX and Houmark like this.
  17. 67 Post GS

    67 Post GS Well-Known Member

    Looks awesome. Best of luck with it.
     
  18. 69GS430/TKX

    69GS430/TKX Silver Level contributor

    Thanks for the suggestions. This engine has always had this problem for as long as I've owned it, both before and after I rebuilt it. I was told it had a 13:1 compression ratio (haven't done the math on myself to verify) but I have tried hotter and colder plugs, different carburetors, and no change. Once it's warmed up and you turn the key off, it will keep running forever or until it runs out of gas, just on the heat and high compression as you said---like a diesel engine can do. The only way I have ever been able to stop it is to put it in 1st gear, put a foot on the brakes, and release the clutch. If it had an auto trans, it would just keep running I guess.
     
  19. hugger

    hugger Well-Known Member

    What fuel you run?
     
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  20. standup 69

    standup 69 standup69

    How high is the idle ? Can try bringing the rpm down with the clutch in gear to around 6-700 rpm and click the key off until you figure it out ..also check for a vacuum leak and or lean condition
     
    GS464 and 69GS430/TKX like this.

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