Crooked engine
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Lead Driver
Joined: Nov 2000
Posts: 6,635
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From: Albuquerque
Crooked engine
This is strange. I never really noticed before but it appears my engine is offset at the crank snout by about 1 1/2" to the passenger side. I know some engine are located with some offset but I don't know of any reason a truck would be.
Any ideas? Maybe I've got one or two incorrect motor mounts or they aren't seated correctly. It's a 400 auto.
Any ideas? Maybe I've got one or two incorrect motor mounts or they aren't seated correctly. It's a 400 auto.
Elder User
Joined: Feb 2008
Posts: 999
Likes: 1
From: Davison, Mi.
Weird how I was just measuring this yesterday and explaining to my son why it is. It's to make room for the driver and controls and to offset the weight of the always present driver.
I got 1 3/4" myself, really roughly measured.
I got 1 3/4" myself, really roughly measured.
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
I never new that until until last week when I pulled the 460 out of my 79 bronco to replace it with the 400 . Unless I saw it 12 years ago when I installed the 460 and just forgot . 
Ah heck Getting old maybe ? 
LOL
Certified Thread Hijacker
Joined: Aug 2001
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Most rear axles are offset too (although Ford is pretty good about NOT doing that with trucks)
Josh
Josh
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I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
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From: Northshore, MN
Piggybacking this thread with a question of my own.
Has anyone figured out the exact measurement the offset to the passenger side is on a 4x4? ( I know it's built into the perches, but I don't have them at my disposal to measure)
At the motor mount bolt hole centers, is the offset the same for all engines? IE, if I put a 390FE in place of the 351M would the crank centerline stay the same?
I was designing a '62 Fairlane to use the 4x4 perches as a bolt in, however the Fairlane has no offset like the 4x4 does. I still want to use the 4x4 motor mounts, but will have to modify/make my own perches to undo the perch offset, but by how much? Everything is buried under snow, so I can't just go measure everything. Winter is planning time for me. Secondly, as the perches come out of my '78 F150 4x4 to make room for a different engine, I need to factor in the offset so that the linkages, tcase, etc... all line up correctly. So to know the true offset would help twofold. Thanks.
Has anyone figured out the exact measurement the offset to the passenger side is on a 4x4? ( I know it's built into the perches, but I don't have them at my disposal to measure)
At the motor mount bolt hole centers, is the offset the same for all engines? IE, if I put a 390FE in place of the 351M would the crank centerline stay the same?
I was designing a '62 Fairlane to use the 4x4 perches as a bolt in, however the Fairlane has no offset like the 4x4 does. I still want to use the 4x4 motor mounts, but will have to modify/make my own perches to undo the perch offset, but by how much? Everything is buried under snow, so I can't just go measure everything. Winter is planning time for me. Secondly, as the perches come out of my '78 F150 4x4 to make room for a different engine, I need to factor in the offset so that the linkages, tcase, etc... all line up correctly. So to know the true offset would help twofold. Thanks.
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Lead Driver
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Piggybacking this thread with a question of my own.
Has anyone figured out the exact measurement the offset to the passenger side is on a 4x4? ( I know it's built into the perches, but I don't have them at my disposal to measure)
At the motor mount bolt hole centers, is the offset the same for all engines? IE, if I put a 390FE in place of the 351M would the crank centerline stay the same?
I was designing a '62 Fairlane to use the 4x4 perches as a bolt in, however the Fairlane has no offset like the 4x4 does. I still want to use the 4x4 motor mounts, but will have to modify/make my own perches to undo the perch offset, but by how much? Everything is buried under snow, so I can't just go measure everything. Winter is planning time for me. Secondly, as the perches come out of my '78 F150 4x4 to make room for a different engine, I need to factor in the offset so that the linkages, tcase, etc... all line up correctly. So to know the true offset would help twofold. Thanks.
Has anyone figured out the exact measurement the offset to the passenger side is on a 4x4? ( I know it's built into the perches, but I don't have them at my disposal to measure)
At the motor mount bolt hole centers, is the offset the same for all engines? IE, if I put a 390FE in place of the 351M would the crank centerline stay the same?
I was designing a '62 Fairlane to use the 4x4 perches as a bolt in, however the Fairlane has no offset like the 4x4 does. I still want to use the 4x4 motor mounts, but will have to modify/make my own perches to undo the perch offset, but by how much? Everything is buried under snow, so I can't just go measure everything. Winter is planning time for me. Secondly, as the perches come out of my '78 F150 4x4 to make room for a different engine, I need to factor in the offset so that the linkages, tcase, etc... all line up correctly. So to know the true offset would help twofold. Thanks.
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
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From: Northshore, MN
Here's why I am confused: Laying under my Bronco with the 300 I swapped in (same as F150) I get an offset of 3" at the transmission mount, 2" at the oilpan where the perch meets (pan has a kickout on the driver side), and 1.5" for the distance of the perch itself. So the 300 is not an accurate measurement for the V8's. On my '79 Tbird 400cid motor mounts, I measure an equal distance of 4" for both sides, so the mounts on the V8 are the same distance. IIRC, the 302 truck mounts swap side to side as well, making them an equal distance, too. So either the blocks have offset built into them in relation to the crank centerline, or the perches have different offsets between the FE/300 group, 302/351/400 group, and the 460 group. But if all of the perches are offset the same, then I can move on.
Hotshot
Joined: Dec 2003
Posts: 18,423
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From: iowa
IIRC, the 302 truck mounts swap side to side as well, making them an equal distance, too. So either the blocks have offset built into them in relation to the crank centerline, or the perches have different offsets between the FE/300 group, 302/351/400 group, and the 460 group. But if all of the perches are offset the same, then I can move on.
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
Years back I put the 300 into my '79 Bronco using F150 4x4 300 perches mounted in the other holes than the 400 I took out. Everything bolted in. They say the FE shares the same perches as the 300. I've never tried an FE into a 4x4 to know this firsthand. I know the 460 is different, otherwise it would be easier to swap one in. But the driver side 300 perch seemed longer than the 400 perch. That in itself could tell me the offsets between FE's and 302/351/400 are different than each other?
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
The idea is to be able to design the Fairlane so that I can run the 302, pull it, and install a 351W if wanted, or pull that, and install an FE for a Tbolt clone, or put a 434 from Tim Meyer in. So on, so forth. The common parts between these is that the motor mounts for a 4x4 truck all should locate the same, unless the FE is different.
It would have been simple if the perches were centered like the Fairlane is, but they're not, so I can't just bolt the 4x4 perches into the car. I have to "undo" the offset in the perches when I make my own, yet still use the truck mounts.
It would have been simple if the perches were centered like the Fairlane is, but they're not, so I can't just bolt the 4x4 perches into the car. I have to "undo" the offset in the perches when I make my own, yet still use the truck mounts.
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
Here's a quick drawing I did and I think I got it:
