470 short blocks

Discussion in 'Tri Shield Performance' started by ap1672, Nov 27, 2009.

  1. ap1672

    ap1672 Silver Level contributor

    On a ungirdled block, any advantage of using main studs over bolts?

    Any downside on internal balancing to external other than $$$$$?

    Do you have core block and cranks in stock? (wondering about exchanging cores at pickup?)

  2. 70 gsconvt

    70 gsconvt Silver Level contributor

    Hmmm, Jim's web site is down.
  3. Jim Weise

    Jim Weise 1000+HP

    Site is back up, we changed back to my original domain name..


    I don't like main studs in a 455.. We used to use them alot, but always noticed that the main housing would not repeat.. Meaning.. when you torque it up, and then measure the hole, and then break it apart and re-set it up, and re-torque and measure, the holes often don't come back to the same size.

    The main housings have to repeat, to accurately set the main bearing clearances.

    This can vary from block to block, and is applicable to an unfilled block. Once you fill them, they become fairly stable.

    I have a number of 580-600 HP motors out there, with the factory main bolts. They do just fine, and the factory used very good bolts.

    I only use studs in a short fill block, with a girdle.

    No downsides to internal balancing, just the cost..

    Yes, plenty of cores in stock.

  4. StageTwo

    StageTwo It's a Beauty Too.

    It's good to see the site back up, Jim.

    Hey, love the new avatar photo too. More info on that motor please! :beers2:
  5. Jim Weise

    Jim Weise 1000+HP

    There will be a whole write up coming.. have the last dyno session on it coming up tomorrow.

    We will spend 12 hours on the dyno with this one, after tommorrow.

    Ran 2 different cams, and 2 different intakes, fuel pump testing, carb swaps, changed cam timing ect.. and mulitple combinations of the above.

    It's an NOS 455 block, STG 2 pistons, rods, crank, timing cover, balancer and an orginal STG 2 cam is one of the ones tested. Iron STG 2 heads (full port on the intake, untouched exhausts), correct 850 Holley, correct B4B.. it's built to be a "period piece" representative of what a hot street/strip 455 would have been in the early 70's.

    Lots of head flow and dyno sheets.. Heads have the best .500" valve opening intake ports I have ever tested in and Iron head, but they are big, low numbers suffer a bit, and show interesting results on the torque down low.. but they do make the HP..

    Over 500 Hp, with the factory cam.. as you see it sitting in the picture..

    I also built this motor with "old school" clearnances, right out of Buick's HD spec sheet..

    Results are interesting so far..
  6. StageTwo

    StageTwo It's a Beauty Too.

    Sounds like a nice motor. I love the nastalgic approach, something I've been considering as I plan for a 455 (though no actual Stage 2 parts in my budget).

    Looking forward to the full write up (with pics, right?!) :TU:
  7. Guy Parquette

    Guy Parquette Platinum Level Contributor

    The second i saw your avator I knew exactly what it was:TU:
    be interesting to hear what the figures are with that stock stg2 cam.
    I'm guessing there will be a huge difference between that and a cam better suited to the percent of the int/exh flow....but now you throw in the fact that the intake is ported:Do No:

  8. Jim Weise

    Jim Weise 1000+HP

    Ya, intake side of the heads are ported, intake manifold is untouched.. just the parts we had to work with.

    That 226@.050 cam (STG 2) surprised us at the HP it made.

  9. jerry455

    jerry455 Well-Known Member

    Can't wait to see the write-up on this one!
    Jim, You are more than welcome to run that Dual-Quad manifold on that beast if you are so inclined-and feeling ambitious!:grin:
    Thanks for the knowledge to be gained with the results-

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