Modifying 1979 c10 motor mount perches to 66 c20 frame - The 1947 - Present Chevrolet & GMC Truck Message Board Network

russellrox · 12-13-2016, 07:06 AM

I am having issues with motor mount perches. I have a 66 c20, with a swapped in 79 c10 crossmember to convert it to a c10. My issue is the 79 perches sit about 7/8 of an inch too high. What do most people do to modify these to work? I am thinking of going with the spacer route but I would have to trim some frame to make them bolt up properly. Pics if possible on what is needed to modify. I have dirty dingo sliders for my LS swap already so I am set on using this style.

russellrox · 12-15-2016, 05:21 PM

Bump

**Clyde65** · 12-15-2016, 08:34 PM

I've heard some guys make spacers for this issue

For my LS swap, I used POL perches. Still had to trim the top of frame at mount.

65Gregg · 12-15-2016, 10:56 PM

I used the stock 65 V8 mounts in mine, I have an 84 crossmember. The only issue I ran into was the coil on cylinder #8 hit the firewall, I changed to later coils which gave the needed clearance.

12-13-2016, 07:06 AM	#1
russellrox Registered User Join Date: Jul 2014 Location: saskatchewan Posts: 172	Modifying 1979 c10 motor mount perches to 66 c20 frame I am having issues with motor mount perches. I have a 66 c20, with a swapped in 79 c10 crossmember to convert it to a c10. My issue is the 79 perches sit about 7/8 of an inch too high. What do most people do to modify these to work? I am thinking of going with the spacer route but I would have to trim some frame to make them bolt up properly. Pics if possible on what is needed to modify. I have dirty dingo sliders for my LS swap already so I am set on using this style.

12-15-2016, 05:21 PM	#2
russellrox Registered User Join Date: Jul 2014 Location: saskatchewan Posts: 172	Re: Modifying 1979 c10 motor mount perches to 66 c20 frame Bump

12-15-2016, 08:34 PM	#3
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: Modifying 1979 c10 motor mount perches to 66 c20 frame I've heard some guys make spacers for this issue For my LS swap, I used POL perches. Still had to trim the top of frame at mount. __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

12-15-2016, 10:56 PM	#4
65Gregg Registered User Join Date: Jul 2006 Location: Willis, Texas Posts: 754	Re: Modifying 1979 c10 motor mount perches to 66 c20 frame I used the stock 65 V8 mounts in mine, I have an 84 crossmember. The only issue I ran into was the coil on cylinder #8 hit the firewall, I changed to later coils which gave the needed clearance. __________________ 65Gregg Blue long bed White TBSS 61 Impala “The two most important days in your life are the day you are born and the day you find out why.” Mark Twain



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