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  #1  
Old 11-28-2002, 07:29 PM
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Question Isky Ductile rocker q's

For those of you running these rockers how does the oiul get through the rocker arm. I was think that there was a passage way drilled throuth the arm it self. In other words the is not upside down way to put the shafts being there diff from the stock shafts?? And also are these tough rockers. Any failures?
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Old 11-28-2002, 11:44 PM
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Ductile is a stronger material than others used. The way I have read it. Oil should come up through the block and into the shaft like normal. Oil comes out of the shaft onto the inside of the rocker arm.
Other than that, I think I may be missing what your saying.
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Old 11-29-2002, 12:31 AM
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The rocker shafts mount the same as stock...with the oil holes pointing down at the ground.

The Isky Ductile Iron Rockers are the toughest, most durable rocker made for a B/RB engine...bar none.
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Old 11-29-2002, 12:57 AM
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Ductility is the drgree to which a material will deform before ultimate fracture. The opposite of ductility is britttleness. Ductile materials resist the repeated loads on a machine elements better than brittle materials.
that is what it say in my "Machine Elements in Mechanical Design" book
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Old 11-29-2002, 03:51 AM
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Hey dodgepu360-- what is "nodular" iron? I know it is what cast cranks and some Ford 9" center sections are made of, but what are it's properties? I have always wondered, and I hope your book has something on it.
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Old 11-29-2002, 08:50 AM
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Agree with MoparBilly. These are great rockers. No problems in 6 years of use.
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Old 11-29-2002, 03:23 PM
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Cast iron is steel with more than 2% carbon. In the cast iron the carbon froms flakes (visable under a microscope) adn the very small cracks between the flakes is what causes the cast iron to be brittle. Cast iron has almost no ductility and must be formed by casting. Nodular cast iron has a small amounts, around 0.05%, of calcium, cerium, lithium, magnesium, or sodium, added to the metal and when it is cast and allowed to cool slowly the carbon froms balls, instead of flakes. The balls are called nodules, this remoes all the small cracks that are between the flakes and make the the cast iron ductile. Nodular cast iron or ductile cast iron is often used for engine blocks, crankshafts, machine parts and other similar parts.

hope thats what you wanted to know

The Isky Ductile Iron Rockers and Ford 9" center sections are made of the same type of cast iron.
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Old 11-30-2002, 01:16 AM
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I know they get oil the same way through the shafts but the rocker itself oils differently correct. There seems to be a small oil passage on the tip of these. Also the stock ones kinda just trickle around the rocker and get slung by the movement of the rocker it self.
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Old 11-30-2002, 04:17 AM
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Thanks, dodgepu360--just what I was looking for.
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