Rod bolt?
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Rod bolt?

  1. #1
    21' Liberator Jet NORDIC454's Avatar
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    Question Rod bolt?

    I am in the process of gathering parts for my engine build. Its a .100" over 4.250" stroke markIV BBC. Forged eagle crank, internal balance for 6.385" rods. Pistons are solid dome 13.2:1 forged probe. I am looking at eagle rods and wondering what rod bolts I should go with. The motor is going in a 21' Liberator tunnel, pulling a dominator A impeller. This is not all out race effort by any means, just want it to run decent and be reliable. My machinist tells me I will be fine with the 8740 bolts, but I wanted some more opinions. Thanks

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    Super Moderator HammerDown's Avatar
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    Sorry, not a answer to your question but interested in your build.
    Question...did you have that block sonic checked for .100 over?
    4-bolt block?
    Cam, head selection?
    Obviously this isn't going to be a pump gas friendly engine.
    21 Lib...nice
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  4. #3
    Senior Member Factory1's Avatar
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    Go take a look at the Ohio cranshaft thread. A couple pages in got pretty deep into rod bolts, you may find your answere there.

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    Quote Originally Posted by NORDIC454 View Post
    I am in the process of gathering parts for my engine build. Its a .100" over 4.250" stroke markIV BBC. Forged eagle crank, internal balance for 6.385" rods. Pistons are solid dome 13.2:1 forged probe...
    I'm thinking about doing the exact same build. Which Mark IV casting do you have? Good luck.

  7. #5
    21' Liberator Jet NORDIC454's Avatar
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    Im not sure what casting the block is, it is at the machine shop. It is a two bolt that is getting converted to four with arp studs and gm caps. My machinist had it checked and said it was good to go. We are doing a partial fill with hard block. Heads are pro-crap 320s because that is the only aluminum head I can afford, but I know they are good because my uncle has two sesons on them in his tx-19 and they were set up by his machinist. As far has cam goes it will be a Lunati hyd. Roller .250 at .050 110 lobe sep. I would like to bigger on the cam but I already have this one and summer is sneakin up quick. dont have intake yet but will prob. go with victor jr. Carb is a 1050 dominator gonna be converted to e-85. Only thing left to buy for rotating assembly is rods and I'm not sure what bolts are right for my application.

  8. #6
    Senior Member Factory1's Avatar
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    I would buy the best rods you could afford, changing out heads, cam, intakes, easy, rods, not so easy. There's alot of good motors out there running budget type H-beams, but they have their limitations. Build a bottom end you can grow into, not out of. I haven't researched them yet, or heard any feedback about them, but the new Howards Ultimate Duty Billet Rods are 100% American made, by a company with a long history of great products, and the prices are very reasonable. If I was building mid/high output motor with a budget in mind, I would spring the little extra dough, and give them a try over H-beams. Those are just my thoughts, I'm sure somone will disagree. Check them out for yourself at Howards Racing Components.

  9. #7
    Cantard 71hallett's Avatar
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    The regular bolts that come with them will be fine in your combo.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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