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New low E.T. from the 350 boat anchor

Discussion in 'Small Block Tech' started by Tom Miller, Apr 23, 2017.

  1. Tom Miller

    Tom Miller Old car enthusiast

    Threw a pair of slicks on my car for today's trip to the Dragstrip.
    The all cast iron 350 went 12.89@102 with a 1.79 60ft.
    I tried a couple things to either prove positive or negative gain.
    I tried flipping the air breather lid, which proved to be zero gain, nor loss. It may work on bigger cubic inch cars, or maybe a car with a restrictive air breather, but on this car, was worth nothing.
    Tried launching the car off idle, to flash converter, which slowed it down, just didn't like it.
    Lastly, plugged the PCV port on the carb. The car had gone a 12.94,95,96 prior to the PCV plugging. It immediately produced a 12.89@102 which was both best E.T. and MPH of the day.
    Last pass car spun and had some heat soak, worst 60 ft of the day, a 1.82 but still went 12.97
     

    Attached Files:

  2. Tom Miller

    Tom Miller Old car enthusiast

    Little green giant killer.
     

    Attached Files:

  3. Mark Demko

    Mark Demko Well-Known Member

    Awesome job!!!
    Care to share some specs on your engine/drivetrain build, set up?
     
  4. Tom Miller

    Tom Miller Old car enthusiast

    I should probably say on the flipping of the breather lid comparison, I run a 3 1/2 inch high flow WIX filter that has the lid raised 1/2 inch off the breather housing.
    As far as my build, it's a .030 over balanced 350 with 11.66 measured compression ratio, no porting or port matching, mild cam adjustable pushrods, stock GM valves, blocked heat crossover, Qjet by Ken at Everyday Performance,TH350 trans with 2200 converter, 4.10 gear.
    No magic, it just works together pretty well.
     
    Mark Demko and Dano like this.
  5. sean Buick 76

    sean Buick 76 Buick Nut

    Pic of the engine bay? exhaust manifolds still used?
     
  6. Tom Miller

    Tom Miller Old car enthusiast

    will have to dig up a pic later, but yes, all cast iron, exhaust manifolds, full 2 1/2" exhaust.
     
  7. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Impressive. With 11.66 SCR, even with a mild cam (like the TA212), the DCR would be well into Race Gas territory.?
     
  8. gscalifornia

    gscalifornia Small blocks rule!!

    Very impressive! Could I ask what size slicks you're running and shift points, trap rpms? 4.10 gears would kill my highway driving, but sounds like they are a lot more fun than my 3.23 gears! You must be almost at the point of a little air under the front tires at launch!
     
  9. Tom Miller

    Tom Miller Old car enthusiast

    Larry, yes, race gas only 22initial,33 total dist curve.
    Ken, 14" slicks 26.5x8 5400rpm shift points, about same through the traps. Daylight under the left front every pass yesterday, on a well prepped track it has seen daylight on the redlines as well.
    If you're running mid 13's on pump gas with 3.23's, I wouldn't touch a thing. That is a strong running, street friendly car.
    Mine is purpose built, and I'm handcuffed to the local airport for aviation fuel/race gas.
     
    gscalifornia and alec296 like this.
  10. sean Buick 76

    sean Buick 76 Buick Nut

    Mine drives fine on the highway with the 4.56 gears and 33 inch tall tires...
     
    Tom Miller likes this.
  11. Tom Miller

    Tom Miller Old car enthusiast

  12. Mark Demko

    Mark Demko Well-Known Member

    Nice car and engine bay too!
    That's some big compression there with iron heads for sure!!
    Your street drive it much or mostly track with those 4.10 gears?
     
    Tom Miller likes this.
  13. Bigpig455

    Bigpig455 Fastest of the slow....

    What Tom is not telling you is how beautiful this car is in person.... a maybe 20k mile gramma car, done with incredible eye for detail. His approach is so simple - compression, gear and converter - it had really made me rethink my own strategies..
     
    killrbuick66455 likes this.
  14. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    We must have better air here in Michigan is why our cars run so good!?:p

    Although I prefer to use pump gas to go fast, you really can't deny the results of what huge dynamic compression can do(kind of like using N0S without having to use N0S), nice job Tom.

    What track is that in the picture? If its an eastside track I wouldn't mine seeing a sbb 350 run in the 12s sometime!


    Derek
     
  15. Dano

    Dano Platinum Level Contributor

    My old 350 (built mid 90's) ran very low 13's with a 4-sp., 3.73's (very streetable - drove it 600 mi. to the Nationals w/245/60R15's) 10.5 SCR (measured) Hooker Headers, 2-1/2" exhaust, ported heads, T/A intake (no port matching) KB 113 cam (IIRC - been a while), '73 rods, balanced. I never really even got it dialed in - 60' times were awful but the with the MPH I'm assuming it had high 12's in it. Like Tom's it just seemed to all work well together. We didn't have much info. back then to work off of.
     
  16. Mark Demko

    Mark Demko Well-Known Member

    Same thing I was thinking.
    I'm thinking the gear contributes the most to the combo.
    The convertor is mild, BUT it matches the cam's characteristics.
    That static comp ratio has me WOWED!
    Good for Tom for stuffing compression into it, and A LOT of it:D
    What made you try plugging the PCV? Never heard of that, but it sure made a difference!
    I'm thinking it richened up the fuel mixture a tad by doing soo_O
    You really don't rev the snot outta it, which I like, even with the 4.10's
     
    Last edited: Apr 25, 2017
  17. Tom Miller

    Tom Miller Old car enthusiast

    Plugging the PCV was suggested by Rob Ross. With the PCV hooked up, you basically have a fluctuating vacuum leak that is introducing polluted crankcase air right into the air/fuel mixture.
     
  18. alec296

    alec296 i need another buick

    I have heard that some racers run a vacuum pump on crank case and pick up several ponies .
     
    Tom Miller likes this.
  19. Mark Demko

    Mark Demko Well-Known Member

    Makes sense.
    Do you do anything to provide ventilation for the crankcase while the PCV is disabled?
     
  20. Fox's Den

    Fox's Den 355X

    Nice run Tom you are rocking now. I use the one way check valve at the header and run a hose on each side to the valve cover with a push in breather and have a filter at the back of the valve cover on each side, I never run the PVC. The pvc will dilute the gas mix some. You do need something to pull the air out of the crankcase if you run with out the pvc. I chose to run the hose into the header.
     

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