73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Dave W on February 17, 2019, 01:29:02 pm

Title: 78 C10 flex plate bolt hex size
Post by: Dave W 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!!

Title: Re: 78 C10 flex plate bolt hex size
Post by: JohnnyPopper 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 )

Title: Re: 78 C10 flex plate bolt hex size
Post by: not76 on February 20, 2019, 10:27:15 am

7/16×20 threads with a 5/8 head if I recall correctly.