Author Topic: 79 SWB truck. Widened rear tank strap frame access hole by 1/4 inch affect frm?  (Read 906 times)

Offline mercado1211

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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.

Offline Rapid Roy

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Welcome
1974 Cheyenne 10 LWB 350/TH350/AC/4 BBL Quadrajet
Mopar by Birth
Chevy by Choice

Offline mercado1211

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Thanks,

Online bd

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As long as the hole is round and doesn't have any internal gouges or deep nicks in its circumference, it should be fine.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline mercado1211

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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.

Online bd

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11/16" away from the radius of the flange is ample spacing and should be of no concern.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline mercado1211

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Thanks,.,

Online bd

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How to upload pics to the forum from your PC

You may need to resize the file in MS Paint or something similar.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline mercado1211

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here is the pic, about 5/16 from where the radius begins.

Online bd

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...It's about an 1/8 inch closer than it was before....

It's insignificant.  You can take your attention off of it.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline mercado1211

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Thanks BD,

Again, appreciate you looking at it.