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04-14-2005, 06:57 AM
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CC Member
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Join Date: May 2001
Location: Oak Forest, IL,
IL
Cobra Make, Engine: B&B w/FRPP 347ci 450HP Crate
Posts: 896
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Not Ranked
Motor MOunts
How did everyone deal with the fact that the stock motor mount bolt holes are smaller than the diameter of the tube B&B puts in the frame? I drilled mine out with a hand drill (Yuck), and when I swap the engine would prefer to do it cleaner. Any more elegant tricks?
Tom
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04-14-2005, 10:49 AM
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CC Member
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Join Date: Nov 2000
Location: Menasha,
WI
Cobra Make, Engine: B+B 351w #112
Posts: 600
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Not Ranked
Mine were the same size. If I remember correctly, Bryan gave me the part number for the mounts. Said it was a NAPA part number. Went to a local NAPA store and tried to order the mounts. No such number they said! Called Bryan and ordered them from him. Shipped them to me. Opened the box and found a NAPA box inside. Same number as he gave me over the phone! Jim
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04-14-2005, 11:00 AM
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CC Member
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Join Date: May 2001
Location: Oak Forest, IL,
IL
Cobra Make, Engine: B&B w/FRPP 347ci 450HP Crate
Posts: 896
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Not Ranked
Did you need to widen the bolt holes that go to the frame?
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04-14-2005, 09:22 PM
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CC Member
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Join Date: Nov 2000
Location: Menasha,
WI
Cobra Make, Engine: B+B 351w #112
Posts: 600
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Not Ranked
My motor mounts were welded to the frame when I picked up the car from B+B. Jim
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04-15-2005, 12:24 PM
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CC Member
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Join Date: Jan 2002
Location: Bridgewater,
NJ
Cobra Make, Engine: B & B
Posts: 1,323
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Not Ranked
When I installed my engine the motor mounts were attached to it. Once in place I welded the mounts to the frame. It worked quite well. It was a little hard to weld. I am sure you could just tack it in place, remove the engine and weld the rest of the way around.
__________________
Just enough knowledge to build a cobra and be dangerous...
You can observe a lot from just watching.
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04-15-2005, 12:45 PM
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CC Member
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Join Date: May 2001
Location: Oak Forest, IL,
IL
Cobra Make, Engine: B&B w/FRPP 347ci 450HP Crate
Posts: 896
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Not Ranked
What I am talking about are the slots on the two ears of the mounts. The bolt that goes through the tube in the welded on engine mount is larger than the holes in the brackets.
Tom
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04-15-2005, 05:00 PM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
...and there is a left and a right side mount, all though they look almost identical. You can bolt either one on either side, and they will "kinda sorta" fit, but they won't fit "perfect".
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03-26-2006, 04:25 PM
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CC Member
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Join Date: May 2001
Location: Oak Forest, IL,
IL
Cobra Make, Engine: B&B w/FRPP 347ci 450HP Crate
Posts: 896
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Not Ranked
Is there really a left and right? The prothane replacements I got look identical. How will they not fit??
Tom
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03-26-2006, 07:10 PM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
my mounts are the same.It is the block that is off set ! what does potatoe mean?
__________________
the older i get the faster i was.
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03-27-2006, 05:14 AM
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CC Member
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Join Date: May 2001
Location: Oak Forest, IL,
IL
Cobra Make, Engine: B&B w/FRPP 347ci 450HP Crate
Posts: 896
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Not Ranked
Do you know the part number for your mounts? Potato is a carbed vegetable, and I am running a carb on my car  What intake are you running on your 351? Are you using the oval air cleaner? |
03-27-2006, 06:05 AM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
There is a left and right side motor mount! Also, I too had to enlarge my holes for my bolt. Not a big deal given all the other mods I have had to make.
Like Ernie said you can bolt either side to the block and they will apear to fit but not quite. You won't be the first to have to lift your engine back up to switch motor mounts.
Clois
__________________
Sunshine, Asphalt and no stop signs...Perfect
"Let's roll"
"Be part of Something Good
......Leave Something Good Behind!"
from CD "Long Road Out of Eden"
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03-27-2006, 07:47 AM
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CC Member
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Join Date: May 2001
Location: Oak Forest, IL,
IL
Cobra Make, Engine: B&B w/FRPP 347ci 450HP Crate
Posts: 896
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Not Ranked
What is the effect if the mounts are swapped? Does the engine sit crooked? Does it not settle in (per my other post)? How did you go about enlarging the bolt holes? I am assuming you are reffering to the long bolts that go to the frame mount. How can one tell the difference in the two mounts?
Tom
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03-27-2006, 06:45 PM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
Ohboy,my 351 has edelbrock fuel injection.I was looking at tony branda's oval air cleaner,havn't got it yet.I reamed out the holes with a hand reamer.I also had to get 351 frame mounts from Karen,they are lower and narower than the 302mounts that came with my kit.sorry no numbers on my rubber mounts got'em on ebay.i asked the guy about right and left he said they are the same.I cant see any difference ,so i would like clarifacation on what the difference is before i weld the frame mounts in also. I tried mine both ways and they seemed to work so what is the diff??????????
__________________
the older i get the faster i was.
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03-27-2006, 07:12 PM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
Ohboy.
Yes, I am referiing to the long bolts and I also reamed mine out with a die grinder. I guess one could use 3/8" bolts instead of 1/2" but I didn't want to do that. I believe the motor mounts have numbers on them and if I am not mistaken the lowest number would be the drivers side ie: (7502 Drivers side and 7503 Pass side). What will happen is that one side will fit and look fine and the other side won't quite drop in or align, Good luck.
Clois
__________________
Sunshine, Asphalt and no stop signs...Perfect
"Let's roll"
"Be part of Something Good
......Leave Something Good Behind!"
from CD "Long Road Out of Eden"
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