Converting V6 to V8 engine mount question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

remist17 · 09-12-2010, 02:34 PM

I am swapping out a V6 for a V8 in my 1987 R10. I knew the mounts are different so I went to a you pull it and found a 86 that had the 8 cyl brackets. It had a utilty body so I am assuming it was at least a 3/4 ton truck. Came home and the brackets are not even close to matching up to the holes in the frame.

My questions:
1- Is there a difference between 1/2 ton and 3/4 ton engine brakets?
2- Is there mounting holes in the frame for a 8 cyl or do I have to drill
3- Is there a difference between 4x4 and 2x4 brakets?
(the brakets in question are the ones that mount to the frame and cross member)

What am I doing wrong !

Please help!!!

remist17 · 09-13-2010, 08:03 AM

bump for some help

GmtGmt · 09-13-2010, 08:58 AM

im pretty sure that there are diffrence bettwen 4WD and 2WD motor mounts

remist17 · 09-13-2010, 12:05 PM

ok... I could have swore the one I pulled was a 2 wheel drive.... but maybe i was wrong... I will look tomorrow (go back to the yard)

remist17 · 09-13-2010, 02:25 PM

Since I have not gotten much support I sat down at the junk yard and compaired several square bodies. My 87 had a 1 3/8 top flange of the frame and a 2 1/2 bottom flange of the the frame. The engine mounts center line to centerline was 17 1/2"

Looked at a 86 C10 Truck Top flange of frame was 1 1/4" bottom of flange was 2 1/4" and centerline to centerline was 16"
Looked at a 87 Suburban Top flange of frame was 1 3/8" bottom of flange was 2 1/2" and centerline to centerline was 17"

So to answer many people no these frames are not all the same.
Hopefully if anyone searches they will find this thread and shed some light.

09-12-2010, 02:34 PM	#1
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	Converting V6 to V8 engine mount question I am swapping out a V6 for a V8 in my 1987 R10. I knew the mounts are different so I went to a you pull it and found a 86 that had the 8 cyl brackets. It had a utilty body so I am assuming it was at least a 3/4 ton truck. Came home and the brackets are not even close to matching up to the holes in the frame. My questions: 1- Is there a difference between 1/2 ton and 3/4 ton engine brakets? 2- Is there mounting holes in the frame for a 8 cyl or do I have to drill 3- Is there a difference between 4x4 and 2x4 brakets? (the brakets in question are the ones that mount to the frame and cross member) What am I doing wrong ! Please help!!! __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops. Last edited by remist17; 09-13-2010 at 02:25 PM.

09-13-2010, 08:03 AM	#2
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	Re: Converting V6 to V8 engine mount question bump for some help __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops.

09-13-2010, 12:05 PM	#4
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	Re: Converting V6 to V8 engine mount question ok... I could have swore the one I pulled was a 2 wheel drive.... but maybe i was wrong... I will look tomorrow (go back to the yard) __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops.

09-13-2010, 02:25 PM	#5
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	Re: Converting V6 to V8 engine mount question Since I have not gotten much support I sat down at the junk yard and compaired several square bodies. My 87 had a 1 3/8 top flange of the frame and a 2 1/2 bottom flange of the the frame. The engine mounts center line to centerline was 17 1/2" Looked at a 86 C10 Truck Top flange of frame was 1 1/4" bottom of flange was 2 1/4" and centerline to centerline was 16" Looked at a 87 Suburban Top flange of frame was 1 3/8" bottom of flange was 2 1/2" and centerline to centerline was 17" So to answer many people no these frames are not all the same. Hopefully if anyone searches they will find this thread and shed some light. __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops. Last edited by remist17; 09-15-2010 at 02:07 PM.



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