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engine mounts on a '63 poly versus 88 LA 318
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59finnedwarrior
Posted 2015-08-12 9:03 PM (#486991)
Subject: engine mounts on a '63 poly versus 88 LA 318



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Location: Alberta Canada
Swapping out a 318 poly in a '63 Plymouth and replacing it with an '88 LA out of a 5th Ave. The motor mounts are a bit of an issue-the driver's side lines up great so the poly engine mounts bolt right on but the passenger's side doesn't work out. The bottom bolt doesn't line up when the mount is bolted up the way it came off the poly-see photo. If you flip it over the mount looks right but you can't bolt up one of the bolts on the double-bolt side of the mount. Is there a trick to this or is there an adapter available?



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JT Vincent
Posted 2015-08-14 12:31 AM (#487091 - in reply to #486991)
Subject: Re: engine mounts on a '63 poly versus 88 LA 318



Expert

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Location: Jamaica Plain, MA
I'd say, fab a mount. I don't know if an 88 LA 318 has different mounting ears than earlier LA 318s. 80's vintage stuff makes me nervous.
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59 in Calif
Posted 2015-08-14 10:17 AM (#487121 - in reply to #486991)
Subject: Re: engine mounts on a '63 poly versus 88 LA 318


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Location: Hayward, Calif
I agree with Vincent, fab another mount to fit. Put a level across the top of carb, get as close as you can. Also recheck driveline angle, it may change. Jerry
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JT Vincent
Posted 2015-08-15 6:50 PM (#487236 - in reply to #487121)
Subject: Re: engine mounts on a '63 poly versus 88 LA 318



Expert

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Location: Jamaica Plain, MA
I in turn agree with Jerry. If you don't have the resources to make a mount or an adapter for the original mount, you can mock one up with cardboard and get a welding shop to make one up for you. It's not complicated or expensive, you just have to make sure the geometry is right. With a fabbed from scratch mount you may want to do both sides, your isolating engineering should be close to the same on both sides-- eg: the same material and thickness. You just make a U shaped bracket and use a rubber or urethane pad. You can use solid mounts but they will shake. I'd probably buy 2 new mounts, and modify the one that is giving you a hard time. They are cheap. Wondering what you did/are going to do with your transmission options. The 63 transmission is better for setting up your push buttons and parking brake. You also need to ditch all that computer stuff. 88 Wasn't a good year for electronics. The motor is probably the same as any LA engine, and isn't innately troublesome. -JV
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58coupe
Posted 2015-08-16 9:17 AM (#487266 - in reply to #486991)
Subject: Re: engine mounts on a '63 poly versus 88 LA 318



Expert

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Location: Alaska
Have you tried to bolt the mount on the back side of the block flanges? Not upside down, IIRC the flanges were the same until the 360 block in 1971.
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JT Vincent
Posted 2015-08-16 6:04 PM (#487308 - in reply to #487121)
Subject: Re: engine mounts on a '63 poly versus 88 LA 318



Expert

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Location: Jamaica Plain, MA
This is a 1988 block... I think it will be fine, but, I really hate 1980's tech.
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Powerflite
Posted 2015-08-22 6:22 PM (#487769 - in reply to #486991)
Subject: RE: engine mounts on a '63 poly versus 88 LA 318



Expert 5K+

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Location: So. Cal
Yep, your problem arises because the poly block is wider at the mounts than the LA motor. The old poly mounts are actually the same as the old hemi mounts. So your new motor is too narrow to fit into the original place. You need to extend them out to get it to work. All 273 and 318 LA mounts are the same. 340 and 360 motors have a different driver-side mount only, but use the same passenger side mount as the 318.
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61sene
Posted 2015-10-02 7:40 PM (#491217 - in reply to #486991)
Subject: Re: engine mounts on a '63 poly versus 88 LA 318



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Posts: 43
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Location: temperance, MI
I know this is prob kinda late but did you try schumaker creative services? They make engine swap bracket s for alot of 62 and up mopars in many engine configurations, I got the mounts for my 61 through them. Nice products-Joe
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flathead4848
Posted 2016-09-28 11:15 PM (#522290 - in reply to #486991)
Subject: Re: engine mounts on a '63 poly versus 88 LA 318


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Posts: 5

Hi All; I have a 55 dodge coronet 2dr with a junk 270, and I have a 88 Chrysler 5th ave 318I am going to put the 88 in the 55. the 270 is front mounted to front cross member with a horse-shoe type mount. I think a set of truck engine mounts then rectangle style rubber mounts , then weld in frame mounts would work . I cant find the steel mounts for the motor to rubber will gladly take any ideas. Mike H. flathead4848

Edited by flathead4848 2016-09-28 11:21 PM
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58coupe
Posted 2016-09-29 9:30 AM (#522303 - in reply to #486991)
Subject: Re: engine mounts on a '63 poly versus 88 LA 318



Expert

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Location: Alaska
I would look at a Dodge p.u. from the 70s to 80s. I believe their mounts are attached to the frame on each side like you are looking for. Make sure it was a V-8 not a 6.
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