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Bulltear 6 to V8 Engine Mount/Adapter

Printed From: TheAMCForum.com
Category: The Garage
Forum Name: AMC V8 Engine Repair and Modifications
Forum Description: AMC-made V8 engine mechanical, ignition and fuel from basic repair to high-perf modifications
URL: https://theamcforum.com/forum/forum_posts.asp?TID=53302
Printed Date: Mar/28/2024 at 1:47pm
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com


Topic: Bulltear 6 to V8 Engine Mount/Adapter
Posted By: Gremil
Subject: Bulltear 6 to V8 Engine Mount/Adapter
Date Posted: Aug/24/2013 at 6:09pm
I didn't know for sure where this topic should be posted, but the forum at Bulltear is down so I came here in hopes of finding someone with experience with this product already.

What I am doing is putting a V8 into a 77 Gremlin which never had a V8 (76 was the last year of the V8 Gremlin). I thought to save time by using the Bulltear 6 to V8 engine mount/adapters. I read where those that used them were satisfied with them and saved a lot of headache. However, I've installed the engine and the rear of the engine is directly in contact with the firewall. My measurements put it roughly one inch too far to the rear. The Bulltear mounts can only bolt in one way, so what gives? Anyone run into this problem?

Thanks in advance. Smile


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My 77 Gremlin Project:
http://www.upmpg.com/projects/amc_gremlin/ - http://www.upmpg.com/projects/amc_gremlin/



Replies:
Posted By: pit crew
Date Posted: Aug/24/2013 at 6:15pm
Used them on my 73 Hornet with only a minor issue. I seem to remember though that there was some mention from Bulltear that for some years you had to drill another hole. I just don't remember if that was for later years or earlier years. My issue I think had more to do with the fact that I went with a TH400 transmission at the same time and that kind of caused me a minor issue with the pinion angle.


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73 Hornet - 401EFI - THM400 - Twin Grip 20


Posted By: Gremil
Date Posted: Aug/24/2013 at 8:11pm
I appreciate your response. My Gremlin already had the second hole. I did order the drill guide and those holes matched up perfectly. I can run the car this way, but the engine is touching the firewall and that's unacceptable. After further study I find I might be more closer to 1/2 inch farther back than I was before. I've not got enough slack in the mounts to make up that much. Maybe a 1/16 of an inch can be pulled out of the slack in the holes, but not anything near 1/2 inch.

It's always something! Confused


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My 77 Gremlin Project:
http://www.upmpg.com/projects/amc_gremlin/ - http://www.upmpg.com/projects/amc_gremlin/


Posted By: pit crew
Date Posted: Aug/24/2013 at 9:23pm
Originally posted by Gremil Gremil wrote:

It's always something! Confused
I hear you on that one. As they say, been there, done that.


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73 Hornet - 401EFI - THM400 - Twin Grip 20


Posted By: spook72x
Date Posted: Aug/24/2013 at 9:53pm
I USED A SET ON A FRIENDS '77 AND THEY FIT GREAT, NO CLEARANCE ISSUES AT ALL. IF I NEED TO SWAP 6 FOR A 8 IN THE FUTURE I'D USE THEM OVER A V-8 CROSSMEMBER. HIS MOTOR DROPPED RIGHT IN,  URETHANE MOUNTS WAS A PLUS, HEDDER FIT WAS AS GOOD IF NOT BETTER THAN MY V8 CROSSMEMBER.  THERE MIGHT BE SOMETHING SIMPLE THAT YOU OVERLOOKED? EVEN WITH V8 CROSSMEMBER MOTOR IS VERY TIGHT. PASSENGER SIDE HEAD IS PROBABLY ONLY ABOUT 1/2''AT BEST.


Posted By: Gremil
Date Posted: Aug/24/2013 at 10:52pm
Originally posted by spook72x spook72x wrote:

I USED A SET ON A FRIENDS '77 AND THEY FIT GREAT, NO CLEARANCE ISSUES AT ALL. IF I NEED TO SWAP 6 FOR A 8 IN THE FUTURE I'D USE THEM OVER A V-8 CROSSMEMBER. HIS MOTOR DROPPED RIGHT IN,  URETHANE MOUNTS WAS A PLUS, HEDDER FIT WAS AS GOOD IF NOT BETTER THAN MY V8 CROSSMEMBER.  THERE MIGHT BE SOMETHING SIMPLE THAT YOU OVERLOOKED? EVEN WITH V8 CROSSMEMBER MOTOR IS VERY TIGHT. PASSENGER SIDE HEAD IS PROBABLY ONLY ABOUT 1/2''AT BEST.


I'm double checking myself right now. With the rear transmission mount in place and bolted up, seems to relieve a lot of the contact with the firewall. But still touching the firewall. That can't be right. I've got the engine slid as far forward as the slack in the motor mount holes will allow. Gosh I hate to think I'll have to jerk out that engine and move the holes. That will probably require some welding. Just checked the forum at Bulltear once again and it's still not available. Hopefully there's a simple remedy.

The mounts won't fit on the wrong side (reversed) and besides, they were clearly marked when I received them. In my opinion they are superior to the original V8 mounts in durability based on the construction. Checked to be sure engine is seated down and bolted properly. Maybe it's suppose to be touching the firewall? Hard to believe that. The place the engine is touching is the seam that protrudes down on the passenger side on the firewall. Is it possible that they made that larger on the 77 Gremlin due to the fact it was never to have a V8? If so, I'm in for some serious reworking.

This car has never been in an accident, so the frame's never been distorted. I thought about that possibility already. Hopefully the guys at Bulltear know a solution. Have to wait until they get the forum back up.

Thanks for the input. Thumbs Up


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My 77 Gremlin Project:
http://www.upmpg.com/projects/amc_gremlin/ - http://www.upmpg.com/projects/amc_gremlin/


Posted By: spook72x
Date Posted: Aug/25/2013 at 3:33pm
No, it should'nt touch. I've done several swaps, even mine with Indy heads is very close but don't touch. Makes me wonder if the mounts werent jigged and welded wrong. Lynn's car that I used the Bulltear mounts on was a '77, I moved the break lines up and out of the way but the head, stock cast iron, still had as much room as a v8 crossmember conversion. Best to call and talk to Bulltear, maybe they have had other calls. they may be kinda hard to get hold of but they stand behind their stuff. Good Luck!


Posted By: hoosieramc
Date Posted: Aug/25/2013 at 5:12pm
One thought I had is how new is the tranny mount? If you raise the tail shaft up a bit does the clearance issue go away? Post a few pictures if you can. 

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Posted By: 74Bubblefender
Date Posted: Aug/25/2013 at 5:54pm
Usually any issues like that are from the tranny mount. IIRC if your trying to stuff a 727 in there youll need to bang the firewall to make it fit due the tranny tunnel

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We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564


Posted By: Gremil
Date Posted: Aug/25/2013 at 10:59pm
The transmission mount is new. The engine clears on the driver's side barely. Problem is the seam on the passenger side just to the right of the blower motor mount contacts the rear of the engine at the head and especially the valve cover.

I was thinking about the possibility of the engine mounts somehow being slightly off and to the rear too far. I had heck getting to the rear valve cover bolt on the inline six. Once Bulltear's forum is back online I plan to ask there to see if there's an issue I've overlooked.

Oh yes, one more thing I found out by chance about this car. It's a Canadian AMC. I can't imagine that this matters though. It did have the Canadian electronics for the original distributor for one example that has no bearing on this issue. To my knowledge there is nothing different about AMC cars sold for the Canadian market. 

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My 77 Gremlin Project:
http://www.upmpg.com/projects/amc_gremlin/ - http://www.upmpg.com/projects/amc_gremlin/


Posted By: 74Bubblefender
Date Posted: Aug/26/2013 at 7:59am
Did you use the center hole to align the drill jig or did you use the end of the drill jig on the end of the pad?

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We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564


Posted By: Gremil
Date Posted: Aug/26/2013 at 4:35pm
Originally posted by 74Bubblefender 74Bubblefender wrote:

Did you use the center hole to align the drill jig or did you use the end of the drill jig on the end of the pad?


I already had two holes in my motor mount and they lined up with the jig just fine. I didn't know it had two holes until I pulled the engine so I had already bought the drill jig.

I found the problem, and it was with the transmission mount. Apparently I got sold the wrong one. The old transmission mount appears to be about 1 1/2 inch taller. Doesn't seem like much, but it took the engine off of the firewall once I put back the old tranny mount. I bought this one at Advance so I'll take it back and get the right one if possible. I appreciate the input from everyone. I just felt it had to be something simple, it usually is! Wink


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My 77 Gremlin Project:
http://www.upmpg.com/projects/amc_gremlin/ - http://www.upmpg.com/projects/amc_gremlin/


Posted By: 74Bubblefender
Date Posted: Aug/26/2013 at 5:49pm
FYIY I designed the mounts and the fixture and consumable welding pieces. We keep sharp track of all the components and the fixture. I can tell you they will fit with 98% certainty. I am glad it worked out for you.

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We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564


Posted By: Gremil
Date Posted: Aug/26/2013 at 6:04pm
Originally posted by 74Bubblefender 74Bubblefender wrote:

FYIY I designed the mounts and the fixture and consumable welding pieces. We keep sharp track of all the components and the fixture. I can tell you they will fit with 98% certainty. I am glad it worked out for you.


Yes, I appreciate the quality of the mounts and how easy they were to install. Had I gotten the correct transmission mount I'd have had little to no trouble. These 6 to V8 adapter mounts look a heck of a lot more durable than regular V8 mounts. I researched them and no one had ever had one break or fail. Smile


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My 77 Gremlin Project:
http://www.upmpg.com/projects/amc_gremlin/ - http://www.upmpg.com/projects/amc_gremlin/


Posted By: prostreetamx
Date Posted: Aug/26/2013 at 7:35pm
My 77 AMX was already a V-8 and I was sold the incorrect trans mount when I swapped in a 401/727 combo. I just cut off the wrong portion and welded on the correct taller mount on my new trans mount. They were a lot different.

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Richard Payne

Las Vegas,NV

72 5.7 Hemi Javelin

77 Prostreet 401/727 AMX,

[/URL]


Posted By: Gremil
Date Posted: Aug/26/2013 at 8:17pm
Originally posted by prostreetamx prostreetamx wrote:

My 77 AMX was already a V-8 and I was sold the incorrect trans mount when I swapped in a 401/727 combo. I just cut off the wrong portion and welded on the correct taller mount on my new trans mount. They were a lot different.


I was hoping to avoid doing anything radical. Hopefully when the next engine mount arrives it will be dimensionally like the one it came with. Otherwise it's back to the drawing board! Cry


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My 77 Gremlin Project:
http://www.upmpg.com/projects/amc_gremlin/ - http://www.upmpg.com/projects/amc_gremlin/


Posted By: Krauss101
Date Posted: Aug/27/2013 at 3:40pm
I put a set in my American with a 401 and a727 no problems


Posted By: Gremil
Date Posted: Aug/27/2013 at 8:08pm

Quote I was hoping to avoid doing anything radical. Hopefully when the next engine mount arrives it will be dimensionally like the one it came with. Otherwise it's back to the drawing board! Cry


Actually I was referring to the transmission mount above. It hasn't come in yet. I might take some pictures to show how different some mounts can be if you don't do a side by side comparison assuming I get the right one this time.


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My 77 Gremlin Project:
http://www.upmpg.com/projects/amc_gremlin/ - http://www.upmpg.com/projects/amc_gremlin/



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