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Old 06-27-2019, 08:18 AM
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charlie66 charlie66 is offline
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Default 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 .
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Old 06-27-2019, 12:13 PM
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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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Old 06-27-2019, 12:17 PM
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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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Old 06-28-2019, 08:16 AM
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Quote:
Originally Posted by Bill Hanlon View Post
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.
I dont have any rods that are that old. Do you know if those rods are the same as a 1970 rod? Im trying to figure out if there is an offset on them.

Thanks
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Old 06-28-2019, 08:23 AM
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Quote:
Originally Posted by mechanickeith View Post
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.
Yes, and it helped but i still had to clearance them at the pin. Do you have a rod you could post a pic of? I would like to see one .. You see, im using a big block chevy eagle rod in mine because it has a 2.200 big end. Where the pontiac rod does not come with that size . So im checking if there is an off set on the 4 cyl rod like the rod i have. Im thinking maybe that was why i had the problem..

Thanks
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Old 06-29-2019, 02:35 PM
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Quote:
Originally Posted by charlie66 View Post
Yes, and it helped but i still had to clearance them at the pin. Do you have a rod you could post a pic of? I would like to see one .. You see, im using a big block chevy eagle rod in mine because it has a 2.200 big end. Where the pontiac rod does not come with that size . So im checking if there is an off set on the 4 cyl rod like the rod i have. Im thinking maybe that was why i had the problem..

Thanks
I don't have any stock rods that are out of engines right now. Your issue may be with the BBC rods being used in the Pontiac. The factory 4 banger rods are the exact same rod as used in the Pontiac V8. Are the rods you are using a full floating pin? There is no offset that I know of on the factory rods.
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Old 06-29-2019, 08:30 PM
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Quote:
Originally Posted by mechanickeith View Post
I don't have any stock rods that are out of engines right now. Your issue may be with the BBC rods being used in the Pontiac. The factory 4 banger rods are the exact same rod as used in the Pontiac V8. Are the rods you are using a full floating pin? There is no offset that I know of on the factory rods.
Yes full float. Yeah ill have to check out a stock rod and see. I wish someone here had a picture. lol

Thanks
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Old 06-30-2019, 01:31 PM
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Quote:
Originally Posted by charlie66 View Post
Yes full float. Yeah ill have to check out a stock rod and see. I wish someone here had a picture. lol

Thanks
I have a 4 cylinder torn down and i will take some pictures for you tomorrow.
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Old 06-30-2019, 02:42 PM
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Quote:
Originally Posted by TransaxleTempest62 View Post
I have a 4 cylinder torn down and i will take some pictures for you tomorrow.
Thank you !
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Old 07-01-2019, 01:33 AM
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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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Old 07-01-2019, 08:32 PM
TransaxleTempest62 TransaxleTempest62 is offline
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Quote:
Originally Posted by charlie66 View Post
Thank you !
You're welcome! This rod and piston was pulled out of a 61 4 cylinder. Let me know if you need more pictures.
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Old 07-01-2019, 08:38 PM
tom s tom s is online now
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the pad between the nuts seems thicker than a 389 58-62 rod?Tom
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Old 07-01-2019, 09:30 PM
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Quote:
Originally Posted by TransaxleTempest62 View Post
You're welcome! This rod and piston was pulled out of a 61 4 cylinder. Let me know if you need more pictures.
Can you take one exactly like this?
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Old 07-02-2019, 08:48 PM
TransaxleTempest62 TransaxleTempest62 is offline
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Here you go. I hope this helps. one from each side
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Old 07-02-2019, 10:18 PM
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Quote:
Originally Posted by TransaxleTempest62 View Post
Here you go. I hope this helps. one from each side
It helped alot thank you!

Looks like there is an offset on the stock rod..

What do you guys think?
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Old 07-02-2019, 11:03 PM
TransaxleTempest62 TransaxleTempest62 is offline
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Quote:
Originally Posted by charlie66 View Post
It helped alot thank you!

Looks like there is an offset on the stock rod..

What do you guys think?
Yes there's an offset, its more noticable in the second picture.
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Old 07-03-2019, 08:20 AM
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Quote:
Originally Posted by TransaxleTempest62 View Post
Yes there's an offset, its more noticable in the second picture.
Yes i thought the same thing..

Kind of seems like theres a bigger off set on the eagle rod?
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Old 07-10-2019, 08:43 AM
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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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Old 07-12-2019, 01:40 PM
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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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Old 07-12-2019, 02:08 PM
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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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