194.5 ci rod compared to the 389ci rod
Does anyone know if the 194.5 ci 4 cylinder used the same rod as the 389ci ?
Im asking because the 4 cyl doesnt share its journal with another rod like the 8 cyl does. So would having an offset on the rod big end , would it send it off center from the piston pin? When i rebuilt mine i used Eagle H beams. Theres an offset on the big end. When i installed the rod and piston it put the rod up against the piston boss at the pin. So i had to mill material off the side of the rod to clearance it. Does the stock rod have this offset? Can anyone post a couple of pictures of an actual 4 cyl rod showing the big end to show if it has an offset? Thanks . |
1966 Pontiac Chassis Parts Catalog says 1958-62 Pontiac V8 and Tempest 4 use the same rod, 532294. It lists 541000 for '63 V8 engines, but does not include a listing for '63 four cylinder engines.
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Charlie, as Bill said, the rods are the same. Did you try & swap the installed direction on the Eagle rods? I know the only thing different with the 4 cyl. is the bearings had a small chamfer put on one side where they would normally be up against the next rod. This chamfer was for clearance on the cranks rod radius.
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If you don't find an answer, I'll need to search for the PMD blueprint of '58-'62 rods.
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the pad between the nuts seems thicker than a 389 58-62 rod?Tom
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Here you go. I hope this helps. one from each side
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Looks like there is an offset on the stock rod.. What do you guys think? |
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Kind of seems like theres a bigger off set on the eagle rod? |
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This is a 1965 389 rod. It surely looks different from the stock 4cyl rod posted . At teast i think so. I guess the design change as the years went on?
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Here are pictures of a factory 1962 forged rod - pulled from a 389. There is offset which is more evident when looking at the side clearance of the bearing insert which is installed.
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The reason you see a big visual difference is that the early rods through 1962 were forged and then the switch to cast in 1963 (except for a few high performance engines, of course). Early forged rods were no stronger than the later cast because they still Rockwell test quite soft, but they do tend to fail less catastrophically (stretch vs. break) so we used to run them before the aftermarket finally started producing a reasonably priced forged alternative.
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