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Old Aug 28, 2021 | 01:58 PM
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Default Piston & Rod Question

I have a set of barely used piston rods and pistons that were used in a 427 small block. The engine builder put all the old parts in a box for me to keep, reuse or sell. I was cleaning out my shop and not noticed that the rod caps were lose and not marked with what rod they belong to. My question is are the rod caps matched to each specific rod when purchased? and now because they are mixed up are essentially trash?

I may try to sell....they are 4" stroke Eagle H beam rods and Ross pistons for 0.030" overbore pistons.

Thanks!
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Old Aug 28, 2021 | 02:34 PM
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Someone with very good gaging and plenty of time + patience will have to assemble-measure-disassemble repeat Many times in order to find correct combo that measures all bores round.
Or pay a machine shop to resize all eight rods.

which Ross pistons? Pics + part number?

Last edited by ebbnflow; Aug 28, 2021 at 02:36 PM.
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Old Aug 28, 2021 | 08:37 PM
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Are the rods and caps numbered? It's a common practice when tearing down so this kind of thing doesn't happen.
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Old Aug 28, 2021 | 10:27 PM
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you can also sit down when you have time and start matching the machine marks inside the bores of the big ends. you will be surprised how well you can tell a match from a non-match.
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Old Aug 28, 2021 | 10:33 PM
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Originally Posted by '75
Are the rods and caps numbered? It's a common practice when tearing down so this kind of thing doesn't happen.
oddly the rods are numbered but not the caps.
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Old Aug 28, 2021 | 10:35 PM
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Originally Posted by derekderek
you can also sit down when you have time and start matching the machine marks inside the bores of the big ends. you will be surprised how well you can tell a match from a non-match.
interesting. It is good to know that all is not lost. I was going to just throw them away but will hang onto now.
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Old Aug 29, 2021 | 09:11 AM
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Thats strange...the sides arent stamped at all? All my new rods came stamped on the sides
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Old Aug 29, 2021 | 09:58 AM
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Are the rods and caps made for a radius ground throw type crank shaft? Higher quality rods are all the same as are the caps. I just ran an interior Mic around each rod and cap set of mine to make sure that they were good to go with my new H type bearings. I'd just assemble them with new arp 12 points. just a question, what is the cc dish, valve diameter cuts, C/R with 64 cc heads, and max valve lift. Like my Wiseco customs were for up to 2.20 intakes and .850 max lift with some clearance value so they could even be used on 18 degree heads
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Old Aug 30, 2021 | 08:43 AM
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You can play shell game mix and match.....takes a bit but it can be done.
Look for matching up the parting line, the side chamfer and the side clearance grinding.

Jebby
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Old Aug 30, 2021 | 11:00 AM
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fwiw, have seen some of the cheaper aftermarket rods with inked "stamps" (not laser etched) and that ink Will come off.
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Old Aug 30, 2021 | 12:46 PM
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Jebby has the answer.. With good eyes you can see the hone marks. Also remember that you can send them to get re- sized.

Dom
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Old Aug 30, 2021 | 07:12 PM
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They are laser etched with numbers. I looked closer at them today. Sure enough!
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Old Aug 30, 2021 | 10:14 PM
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Look at what Jebby said, Why take a chance?

Dom
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Old Sep 2, 2021 | 07:33 AM
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Originally Posted by domenic tallarita
Look at what Jebby said, Why take a chance?

Dom
agree…. I was just pointing it out.
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