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Author Topic: 78 C10 flex plate bolt hex size  (Read 1293 times)

Offline Dave W

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78 C10 flex plate bolt hex size
« on: February 17, 2019, 01:29:02 PM »
I have a 1978 2wd C10
V8 5.0 305 with t350 trans
I want to check that flexplate bolts are tight.
I checked the torque converter ones with a 9/16 wrench.
But will need to modify a wrench to get up in there
To check the one that go into the crank.
Anyone know what size that he head is?
Thanks!!
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Offline JohnnyPopper

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Re: 78 C10 flex plate bolt hex size
« Reply #1 on: February 18, 2019, 05:36:36 PM »
11/16 is my gut reaction

Use an open end wrench and a super extendo rod to check would be my suggestion.

( super extendo is a trademark of JohnnyPopper Industries. All rights reserved )
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1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline not76

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Re: 78 C10 flex plate bolt hex size
« Reply #2 on: February 20, 2019, 10:27:15 AM »
7/16×20 threads with a 5/8 head if I recall correctly.
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