How can you tell if the con rods have been machined? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-02-2002, 02:12 PM
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Post How can you tell if the con rods have been machined?

What kind of markings do they put on con rods when they machine them???

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Old 12-02-2002, 02:57 PM
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Take the caps off and if there are radiused machine marks on the mating surfaces then they have been resized.

Steve
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Old 12-02-2002, 05:40 PM
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This is going to sound dumb but this being my first engine how the hell do you get the con rod apart.. I undid the bolts and the cap still isn't coming off
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Old 12-02-2002, 05:45 PM
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I see no sign of any numbers... although on the outside there is a c and another c stamped on the other... I took the con rod cap off and there was no markings on the mating surfaces.. It doesn' even look like there is any room for numbers with the bolts coming out of the con rod and the holes in the cap
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Old 12-02-2002, 06:21 PM
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Make sure that you mark the rods in their original position on the crank. You can do this with a number punch set or a center punch. If you see no markings the most likely they havent been resiezed. If you are rebuilding the motor then they should be resiezed anyway. I'm not sure what the letters are.
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Old 12-02-2002, 06:28 PM
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I should also say that they may not have obvious markings stamped on them by the machine shop after they have been resiezed .
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Old 12-02-2002, 07:58 PM
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When i strip a SBC, i never number the rods, I take them to a machine shop, have them inspected, magnafluxed and checked to see if they need resized. the rods can be run anywhere, as long as the locks on the bearings are pointed to the outside of the block on reassembly, can`t get it wrong, if you do the engine won`t turn a revolution without binding.
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Old 12-02-2002, 08:06 PM
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Well what other indications could there be of machining
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Old 12-03-2002, 03:52 AM
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If the the crank has been cut there should be a # stamped on it like .010/.010. or 10/10. That would indicate that the crank was cut 10 under on the mains and rod journals. Are you intending on rebuilding this motor?
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Old 12-03-2002, 06:34 AM
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Yes I am planning on running like 10.5:1 compression with the stock con rods and crank if they are strong enough and porting the old heads if they aren't cracked and then putting on a new manifold and topping it with a holly double pumper... don't know what I am gunna do for a cam yet
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Old 12-03-2002, 02:59 PM
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If you are going to rebuid it dont worry too much as to whether its been rebuilt prior. You can resieze rods several times (I think) before they are no good. From what you are describing it sounds like it hasn't been rebuilt. I'd recommend a 224/234 cam. Lots of torque and decent top end. You're gonna have a nice motor. And your gonna need one if you ever show up in Regina!!! (lol)
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Old 12-03-2002, 03:50 PM
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Hehe My girlfriend has family down there... I may just have to go take her to her cousins now... I know that the engine has been rebuilt because it wasn't primed the first time it was run (resulting in raped journals on the cam) I am just trying to find out what kind of machining I can do to the thing.....
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