Need measurement for clutch rod hole in firewall ‘67 C10

[weim55]

I just dropped a 67 GMC cab onto my 67C 10 chassis and found the first difference: The 67 GMC had a V6 NP435 4 speed and it appears the hole in the firewall for the clutch rod is in a different location than the Chevy. The second picture posted is of a 71 Chevy cab which I think is a little bit different than the 67 Chevy. Would one of you guys be able to get a measurement of the hole placement on a 67 Chevy cab?

Steve weim55 Colorado
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[georgieb51]

I think you blue cab shows the correct clutch rod hole. In my photo I am pointing to the hole.

[weim55]

The 71 cab “ bumps out“ The area of the clutch rod hole larger to the right side of the vehicle. I looked at a complete 71 I have and the clutch rod has a dog leg to match that slightly different hole. My 67 uses a straight rod coming through the firewall. The red cab you took a picture of looks like the same firewall forming as my 67. Do you know what year that cab is?

Steve weim55 Colorado

[Grumpy old man]

This is a 67 cab .

[georgieb51]

Refer to Grumpy's photo since his is truly a 67 and there are some differences in location due to the shape of the clutch rod.

[pjmoreland]

Here's a photo I took a couple of months ago of a 67 Chevy that had an SBC and an SM420.

[weim55]

OK, out in the garage now. Georgie and grumpy‘s firewalls look identical to mine. Could I get one of you to take a measurement of the diameter of the hole and an East West measurement to the lip of the firewall and north-south to the centerline of the master cylinder stud?

Steve weim55 Colorado

[Grumpy old man]

The clutch rod hole is egg shaped as is the boot so a general measurement will just get you close , If you need a pattern made I can make one and mail it to you ?

[weim55]

Originally Posted by Grumpy old man

The clutch rod hole is egg shaped as is the boot so a general measurement will just get you close , If you need a pattern made I can make one and mail it to you ?

I took the last picture that you posted and scaled it, made a template, used a holesaw to get it close and then finished it out with a die grinder. Sized it to an original boot and it works perfectly! Thank you very much for that it saved the day and the truck was able to drive out of the garage under its own power!

Steve weim55 Colorado