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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: mercado1211 on January 17, 2019, 09:13:34 AM

Title: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?
Post by: mercado1211 on January 17, 2019, 09:13:34 AM
Hello all. This is my first post. I have a 1979 C10 shortbed. My question is I used a step bit to open up a frame hole from 3/4 to 1 inch. Its the tank strap access hole, I opened it to get access to it with a socket. Everything I have read says to not drill near the flange of the frame (top horizontal part). It still has about 11/16 of space between the hole and the flange. Its about an 1/8 inch closer than it was before. Should I put a grade 8 1 inch bolt through it with a plate on the backside with bolts on the corners of the plate for added strength(the tank bracket allows extra bolts through the plate. Or am I being neurotic and seriously overthinking this? Appreciate feedback.

Thanks.
Title: Re: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?
Post by: Rapid Roy on January 17, 2019, 11:13:39 AM
Welcome
Title: Re: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?
Post by: mercado1211 on January 17, 2019, 11:19:52 AM
Thanks,
Title: Re: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?
Post by: bd on January 17, 2019, 01:37:10 PM
As long as the hole is round and doesn't have any internal gouges or deep nicks in its circumference, it should be fine.
Title: Re: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?
Post by: mercado1211 on January 17, 2019, 01:50:41 PM
The hole is a little rough from the step bit but it does not appear to have gouges or deep scratches. Thanks for the reply.
Title: Re: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?
Post by: bd on January 17, 2019, 01:55:19 PM
11/16" away from the radius of the flange is ample spacing and should be of no concern.
Title: Re: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?
Post by: mercado1211 on January 17, 2019, 02:00:01 PM
Thanks,.,
Title: Re: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?
Post by: bd on January 18, 2019, 04:46:30 PM
How to upload pics to the forum from your PC (http://forum.73-87chevytrucks.com/smforum/index.php?topic=6428.msg33933#msg33933)

You may need to resize the file in MS Paint or something similar.
Title: Re: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?
Post by: mercado1211 on January 19, 2019, 12:02:45 AM
here is the pic, about 5/16 from where the radius begins.
Title: Re: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?
Post by: bd on January 19, 2019, 07:55:30 AM
...It's about an 1/8 inch closer than it was before....

It's insignificant.  You can take your attention off of it.
Title: Re: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?
Post by: mercado1211 on January 19, 2019, 08:50:43 AM
Thanks BD,

Again, appreciate you looking at it.