I would be very interested if folks could check original pushrods they might have lying around to see if the stems are hardened, or not. All you need to do is to run a file across the stem. If the file "cuts metal" the stems are not hardened. If the file glides across without cutting, the stems are hardened. Basically, there were 4 pushrods used over the 1955-82 period.
1955-----------------------GM #3703924
1956-61--------------------GM #3837152 (yes, this is the original part number)
1962-63 (250/300 HP)-------GM #3817616
1962-63 (340/360 HP)
All 1964-82-----------------GM #3796243 (we know this one has hardened stems)
If you have some pushrods lying around that you are reasonably sure came from one of the above, it will just take a moment for you to check. Thanks.
Inquiring minds want to know!!!!
1955-----------------------GM #3703924
1956-61--------------------GM #3837152 (yes, this is the original part number)
1962-63 (250/300 HP)-------GM #3817616
1962-63 (340/360 HP)
All 1964-82-----------------GM #3796243 (we know this one has hardened stems)
If you have some pushrods lying around that you are reasonably sure came from one of the above, it will just take a moment for you to check. Thanks.
Inquiring minds want to know!!!!