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03-27-2006, 03:43 AM
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A question about a rebuild
What options do I have if I do not want to go with a new bottom end on a 78 350? Would I have to get the whole assembly balanced if I just reringed it? I called a performance shop close to home and they said theyed recondition my rods for 125 and balance it for 200. I can't remember what he said boring it would be. He said between 400 and 500 I believe. He said it needed to be torque sleeved. Is this true? I'm guessing it is. Theres another shop close to home and they said 20 a cylinder but they do theirs by hand. I would of course rather not go with a bottom end replacement till next winter really. What are my options? I'm really just lookin to freshen it up before summer hits. thanks guys in advance for your suggestions.
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03-27-2006, 06:16 AM
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On a simple refresh-rebuild, street type, sub 6500 rpm engine, there is no need to re-balance the motor. Unless you are changing a major part to aftermkt stuff (crank-stroke etc.) Most of the rebuilders pistons and street performance pistons are similar weights (or lighter, which is good!) as the stockers they replace. Re-sizing rods will not change balance. Plate honing makes little difference on a mild street motor. 5,000 miles down the road and there is no difference.
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03-27-2006, 02:59 PM
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So your saying I could put new pistons in and be fine without the balancing. If I went to a lil higher compression piston would it matter then? I mean thats great news. Alls I'm looking to do right now is clean it up and put a new set of gaskets and bolt to hold it tigether nicely. Thanks again.
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03-27-2006, 06:35 PM
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Balancing should not be an issue, but you should check yor bearing clearances...
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03-27-2006, 10:27 PM
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The new pistons should have weight info with them, but your current pistons may be an unknown weight. If you don't have access to a scale, you can take a piston (and pin) down to the post office and use their digital scale, which claims to be accurate to 1/10 ounce. Multiply the weight in ounces by 28.35, and that's the weight in grams. Take a couple of paper towels with you to wipe the scale off with.
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