Next Nailhead Build 2018

Discussion in ''Da Nailhead' started by SpecialWagon65, Jan 16, 2018.

  1. SpecialWagon65

    SpecialWagon65 Ted Nagel

    Time to plan a "new" engine build. I'll probably keep it
    mostly stock. I have some heavy Ross pistons (785 ? does that sound right?)
    and a LW block so heads worth talking about.
  2. wkillgs

    wkillgs Gold Level Contributor

    Yup, I have a set of 425 Ross forgings in stock. Picked them up when Maddog had them on clearance.
    They're about the same weight as stock. The Ross piston is 787 g, the pin is 159 g, for a total of 947 g.
    A stock 401 is 728 g piston and rings, 222 g for the pin = 950 g total.
    I wonder if there are lighter pins available?

    Which car are you building this for?
  3. dual-quadism

    dual-quadism Black on Black

    What car and what do you want it to do? Resto with gusto? Pro-touring? Bigs/littles track car? Can help you with the camming and general overall build. I am WD with Racetec for pistons and have done a few thin ring builds. Budget plays a big part in the build, as well, as anything up to and beyond 1hp per cube gets expensive quick.

    Wkillgs, yes, light pins should be available. What pin dia did Ross use? .927?
  4. SpecialWagon65

    SpecialWagon65 Ted Nagel

    65 Wildcat "resto with gusto" covers just about everything in my garage.
    Need to build this one for the 5-speed Wildcat Coupe with shorty headers, Tremec, .82 od, 3.42 rear.
    I repurposed the MW that was slated for that project- stuck it in the 64 LeSabre Wagon til I can get that KX done too.
    Nothing like firing up an engine in a car that has not been on the road for 15 years and having it
    run great.
    One of the reasons I have great love for the nailhead is the 401 in my Riviera - first engine I rebuilt on my own-
    in 1994- and it ran great til the rear seal started leaking a couple years ago.

    Now I have done 3 pretty serious nailhead engines, dyno'd and now I feel like i know even less than I did on the first job.
    One thing I concluded from the dyno- do not compromise on pistons or compression, and there is power in the head work.
    dual-quadism- I have a commitment with Tom T for the pistons already- but thank you for the offer.
  5. gs66

    gs66 Silver Level contributor

    I remember when Maddog was selling the Ross forged pistons but did not realize they were that heavy. I didn’t get any and will order from Tom when I do need a set.
  6. telriv

    telriv Well-Known Member

    A stock 425 piston WITHOUT rings weighs 725 grams. The stock pin is 233grams. For a total of 748 grams. My pistons on average are 650 grams & 1" pins are average 150 grams. Now a forged piston being more dense than cast should weigh more. My pistons ALREADY are lightened as part of the forging/design process weighing an average of of 150 grams lighter than stock which = 5.2 ounces less than a stock set-up. With a longer rod & smaller pin the weight is less. Have been as little as 560 & 140=700 grams.
    gs66 likes this.
  7. gsgtx

    gsgtx Silver Level contributor

    i think you meant to say total of 958 for stock pistons
  8. telriv

    telriv Well-Known Member

    You ARE ABSOLUTELY CORRECT Joe, should have been 958 grams. Thta's what happens with short, stubby, old fingers with arthur itis starting to rear it's ugly head.

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