Motor Mount Install Question

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jonn6464

jonn6464

1970 Duster
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Location
Weatherford, TX
- 1970 Duster
- QA1 K Member
- 408 Stroker Engine

I test fit my 408 stroker today, just to check some clearances and to confirm that the motor mounts would work.
IMG_20210207_122949339_HDR.jpg


Went fairly smooth, buy I do have a question about the mounts.
I bought a set of Trans Dapt mounts. In the instructions, the pic of the passenger side has the weird little tabs facing the back of the engine. When I had them that way, I could not get the mount to line up with the K member hole, it was too far outside. I turned them around and was able to get it lined up.
- Want to confirm what purpose those little tabs serve, and see if they need to be a specific direction
- Why is the pass side mount thicker than the driver
-Also, just open to any general comments about the mounts

Here is driver's side...
IMG_20210207_123709221.jpg


Here is the passenger side...
IMG_20210207_123645223.jpg


And what do the tabs do? Do I even need them, can I cut them off?
IMG_20210207_123824729_HDR.jpg


Thanks for any feedback.
 
Looks to be an interlock kind of deal. I'd think that would be on the driver's side, in case the rubber was torn.
 
Are the mounts supposed to be different thicknesses?

Why the washer between mount and block?

Are you sure you have the mounts on correct side of ears, I don't know, just asking.

Are you putting a V8 in a \6 k member?
 
Last edited:
Do you have this instruction sheet? It doesn't look like the same mount you received.

Screenshot_20210207-144908~2.png


The picture looks like a standard mount with no tabs, but it would be facing back, but I still think you'd see a little of the tabs.
 
i thought the QA1 K-member is designed to use the later spool mounts? did not know that the earlier mounts work......the tabs are a fail safe device, if the rubber let go.

Michael
 
Here's the instructions.
IMG_20210207_145152304.jpg


As for the washers, I'm thinking that the LA blocks maybe had different ears? The washers take up the space.
 
Just looked back at your photos. You have a tubular k frame. Is it designed for a V8 or \6 the mounts you have look like the mounts in the photo posted by LocuMob which is a\6 to V8 swap mount
 
Dana67Dart said:
Just looked back at your photos. You have a tubular k frame. Is it designed for a V8 or \6 the mounts you have look like the mounts in the photo posted by LocuMob which is a\6 to V8 swap mount
Click to expand...
K frame is for V8. Yes, the kit I got is /6 to V8, but would think that since the K frame is universal it would work.
 
jonn6464 said:
Yes
Click to expand...
I'd contact TransDapt and ask about the mount, just to clarify. If it fits and the engine is level, and where it's supposed to be, then I wouldn't think there would be an issue. I'm wondering if somehow the wrong mount got out in the kit by accident, or if they have different suppliers for the rubber biscuit.
 
jonn6464 said:
K frame is for V8. Yes, the kit I got is /6 to V8, but would think that since the K frame is universal it would work.
Click to expand...
If the K frame is for V8, it's not "universal", only universal for A engines. If you got the /6 to 340/360 swap brackets, then you got the wrong bracket kit.
 
Professor Fate said:
If the K frame is for V8, it's not "universal", only universal for A engines. If you got the /6 to 340/360 swap brackets, then you got the wrong bracket kit.
Click to expand...

Ok, help me understand what is wrong about the kit. I'm not being a jerk, that's an honest question. Like I said, the mounts line up and can be bolted to the K frame. So, from that perspective, the kit seems to work. I'm just wondering about the orientation of the pass side mount.
 
The QA1 frame is for the small block and the slant 6 has a different style mount on the frame, and theoretically, the conversion kit shouldn't line up to the small block ears, and the mount on the frame. That fact that it does line up puzzles me.
 
if the mount holes are in different places on a /6 compared to v8 and you have /6 to v8 'conversion' mounts then they are designed for a /6 k member. your v8 tubular k member will have the mount holes in a different place to the /6 one so the 'conversion' mounts won't line up.
 
jonn6464 said:
Ok, help me understand what is wrong about the kit. I'm not being a jerk, that's an honest question
Click to expand...
No issues with asking questions...

There are 3 parts to the motor mounts.

  1. The brackets that mount to the engine.
  2. The biscuits (rubber insulators)
  3. The brackets that are welded to the K frame


OEM stock there are 3 (maybe 4) k frames.

  1. 67 to 72? (Biscuit mounts) \6
  2. 67 to 72? (Biscuit mounts) Small block V8
  3. 67 to 72? (Biscuit mounts) 383 V8 (maybe 440 is same,not sure)
At some point 73? the K frame got "spool" type engine mounts. I don't know if there are different k frames for \6 or V8s

The 3 (67 to 72?) K frames are different. The brackets welded to the k frame are different and in different locations.

The biscuits are most likely different.

And the brackets that bolt to the engine are different.

If you had a car that originally had a \6 and you wanted to put a SB V8 in it you can either buy an SB V8 k frame (OEM or aftermarket) and use oem style biscuits and engine brakets or buy conversion mounts which would come with engine brakets and biscuits that would make everything line up.

You can even get conversion mounts to mount a BB v8 in a \6 k fremame IIRC.

What it looks like you have is a SB V8 aftermarket k frame and \6 to V8 conversion mounts. I'm kind of surprised that you could get it to line up.

I believe what you need is OEM style SB V8 biscuits and engine brakets.
 
The pad with the interlocking tabs is designed to be on the driver side. They are a "catch" if the rubber fails to prevent the engine from lifting on the LH side due to high torque. I believe that pad originally went on trucks so the frame mount position may have been set up for that thicker pad. (Let's hear from some of the experts on here that may know which truck/engine, etc!) The tabs function somewhat like a built-in torque strap if you believe they could really hold back the engine.
 
Demonx2 said:
The pad with the interlocking tabs is designed to be on the driver side. They are a "catch" if the rubber fails to prevent the engine from lifting on the LH side due to high torque. I believe that pad originally went on trucks so the frame mount position may have been set up for that thicker pad. (Let's hear from some of the experts on here that may know which truck/engine, etc!) The tabs function somewhat like a built-in torque strap if you believe they could really hold back the engine.
Click to expand...

We'll, I wonder why in the world does it show on the passenger side in the instructions
 
Dana67Dart said:
No issues with asking questions...

There are 3 parts to the motor mounts.

  1. The brackets that mount to the engine.
  2. The biscuits (rubber insulators)
  3. The brackets that are welded to the K frame


OEM stock there are 3 (maybe 4) k frames.

  1. 67 to 72? (Biscuit mounts) \6
  2. 67 to 72? (Biscuit mounts) Small block V8
  3. 67 to 72? (Biscuit mounts) 383 V8 (maybe 440 is same,not sure)
At some point 73? the K frame got "spool" type engine mounts. I don't know if there are different k frames for \6 or V8s

The 3 (67 to 72?) K frames are different. The brackets welded to the k frame are different and in different locations.

The biscuits are most likely different.

And the brackets that bolt to the engine are different.

If you had a car that originally had a \6 and you wanted to put a SB V8 in it you can either buy an SB V8 k frame (OEM or aftermarket) and use oem style biscuits and engine brakets or buy conversion mounts which would come with engine brakets and biscuits that would make everything line up.

You can even get conversion mounts to mount a BB v8 in a \6 k fremame IIRC.

What it looks like you have is a SB V8 aftermarket k frame and \6 to V8 conversion mounts. I'm kind of surprised that you could get it to line up.

I believe what you need is OEM style SB V8 biscuits and engine brakets.
Click to expand...

Before I bought this kit, I searched for regular old small block V8 mounts with brackets. Couldn't find any. Or, there might have been a set on eBay for like $300. But, wasn't gonna pay that.
 
jonn6464 said:
We'll, I wonder why in the world does it show on the passenger side in the instructions
Click to expand...
I still think you got the wrong biscuit for the passenger side, all the ones I've seen have no tabs, and aren't that thick.
 
Sometimes you have to pay to play.

Don't know if what you have will work properly.

Might move engine to one side, rotate it or move it forward or back.
 
Your pass side mount is a truck biscuit mount. They are the same on both sides for those year trucks.

1979 DODGE D100 PICKUP 5.9L 360cid V8 Motor Mount | RockAuto

The mount brackets you've got look like they are to mount a small block to a slant six k-member. If the k-member you've got will accept slant six mounts, you can probably make what you have work. My Schumaker /6 to SB mounts use a thick pass side mount too. I'd bet it's about the same thickness as the one you've got. You just need to figure out what your k-member is made for to know if what you have will work. If it's for a slant six, cut the tabs off that mount and bolt it up. Verify what you have before cutting anything though.
 
I moved away from those type of motor mounts too many failures. And you have a lot more to work than I make. But I will say that the problems were greatly increased by my 275 drag radials
 
It says right in the instructions that they are for a small block to fit on a factory slant 6 K frame. Not a tubular frame. The very first lines. Kim
 
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