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Author
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Topic: Mounting a 5.0 by the head ok?
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steve'66
Gearhead Posts: 2074
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 12-03-2000 10:05 PM
   
A freind is swapping a 5.0 into his 280Z, and he asked me if I thought it'd be ok to mount the engine by the three bolts on the front of the heads. He's using head studs and the heads are aluminum. The plates under consideration will be 3/8" thich, one for each side, and the holes will be precise. (he's a machinist) So what do you all think? I said I'll be ok. Any opinions? I don't wanna give him "bumb" advise. Thanks,SteveW
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cpmaverick
Moderator Posts: 829
From: Auburn, AL.
Registered: Jan 2000
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posted 12-03-2000 10:36 PM
I wouldn't recommend it Steve. If ya think about it, the head bolts are very far away from the center of the crankshaft, so considerable torque would be transmitted to the mounts (a lot more than at the normal mounts, remember torque is a function of force and distance from the force). That torque will be twisting on studs that go into the block... You see how much an engine moves under load with rubber mounts. All of that force (magnified by the longer distance) would be transmitted through the head studs to the frame with no oppurtinity for dampning. (assuming solid mounts) It might very well work, but like a lot of things that 'might' work, I wouldn't want to be the one to recommend it  ------------------
-Charlie Ping
1970 Maverick Grabber
-1987 5.0L B303 roller cam/rockers
-1968 Mustang Toploader
-1977 Lincoln Versailles 9 inch w/discs
-1980 Granada Front Discs
www.MAVERICKGRABBER.com
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Just Jim
Gearhead Posts: 292
From: So Cal
Registered: Feb 2000
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posted 12-03-2000 11:17 PM
Steve,Charlie's right,not a good idea.Plate type mounts usually attach to holes at front of the block,not the heads.There is a site "Small Cars with Big Motors" that has a wealth of info on swaps,including a Ford into a Z car.They even have the infamous 289 Morris there.Go take a look at:http://members.aol.com/danmas/examples.htm#nonbrit Let me know what ya think. ------------------
"Just Falcon Around"
1962 Falcon 351W
1958 Morris Minor 289
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steve'66
Gearhead Posts: 2074
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 12-04-2000 12:29 AM
Thanks guys,But if you don't use the head's threaded holes, which block holes in the front of the block should he use? TIA SteveW
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SteveLaRiviere
Administrator Posts: 14060
From: Saco, Maine MCA # 47773
Registered: May 99
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posted 12-04-2000 05:12 PM
Normally that kind of mounting calls for an engine plate.I wouldn't want to add that kind of stress to the heads either. ------------------
SteveLaRiviere/Webmaster -- MCA # 47773
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Moneymaker
Administrator Posts: 8393
From: Lyons, IL, USA
Registered: May 99
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posted 12-04-2000 07:39 PM
Ahem! Excuse me guys, but take a look at the engine bay pics of MM. I use two of the head bolt holes and one of the block holes for my motor plates. No problems at all. Most of your FAST small block drag cars use a similar arrangement. Steve W. I can get you some patternes if you like. Alex------------------
Alex Denysenko Co-Administrator and Moderator
Fleet of FoMoCo's too long to list!
http://superstockers.homestead.com/week.html
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steve'66
Gearhead Posts: 2074
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 12-04-2000 11:19 PM
Thanks Alex! How about a pic so I can let him know which block bolt to go for. Charlie, Jim, and SteveL;
When you think about it the farther from the centerline of the crank, the more leverage your mounts have to control the engine's torque with less strain on the mounts. But it would be better to include a block bolt. Thanks all, SteveW
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Moneymaker
Administrator Posts: 8393
From: Lyons, IL, USA
Registered: May 99
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posted 12-05-2000 12:31 PM
Steve go to the MM photos section of M&M and there are plenty there. Alex------------------
Alex Denysenko Co-Administrator and Moderator
Fleet of FoMoCo's too long to list!
http://superstockers.homestead.com/week.html
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