Is there an interlocking 307 engine mount? - Chevelle Tech
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post #1 of 10 (permalink) Old Jul 11th, 20, 7:41 PM Thread Starter
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Is there an interlocking 307 engine mount?

Swapping a 307 for a 383, and I bought a set of "short" frame mounts so I could use the standard interlocking SB engine mounts. Now the engine is pulled, and it seems like the only way to change the frame mounts is to pull the lower control arms. With all the aftermarket parts on the market today, does anybody make an interlocking mount for the tall frame mounts?

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post #2 of 10 (permalink) Old Jul 11th, 20, 7:59 PM
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Re: Is there an interlocking 307 engine mount?

Olle,
Not sure if 69 is that much different than my 71 but I had the frame mounts off mine and reinstalled them with the control arms on. If I remember correctly it took a couple of long extensions and a u-joint socket but it was doable.

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post #3 of 10 (permalink) Old Jul 11th, 20, 8:41 PM Thread Starter
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Re: Is there an interlocking 307 engine mount?

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Originally Posted by BillK View Post
Olle,
Not sure if 69 is that much different than my 71 but I had the frame mounts off mine and reinstalled them with the control arms on. If I remember correctly it took a couple of long extensions and a u-joint socket but it was doable.
I was able to do it on my '71 Camaro 25 years ago, as far as I remember it has some larger holes where you at least could get some access. It was a PITA and required some dexterity and bad language, but still doable. Not so sure about the Chevelle though. I could probably get the old mounts off, but reaching in there to put the nuts back... well, I sure don't know. I have been under there shining through the holes with a flashlight, and I just couldn't see a way to do it. I was pretty pooped by the end of the day, so I guess I'll look at it with fresh eyes tomorrow. Maybe some beer will help.

Still, it would be nice to find good, interlocking 307 mounts, that would make it entirely painless. I figure it would be a very common swap, so surely enough there's something out there?

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post #4 of 10 (permalink) Old Jul 11th, 20, 8:46 PM
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Re: Is there an interlocking 307 engine mount?

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Originally Posted by Olle View Post
I was able to do it on my '71 Camaro 25 years ago, as far as I remember it has some larger holes where you at least could get some access. It was a PITA and required some dexterity and bad language, but still doable. Not so sure about the Chevelle though. I could probably get the old mounts off, but reaching in there to put the nuts back... well, I sure don't know. I have been under there shining through the holes with a flashlight, and I just couldn't see a way to do it. I was pretty pooped by the end of the day, so I guess I'll look at it with fresh eyes tomorrow. Maybe some beer will help.

Still, it would be nice to find good, interlocking 307 mounts, that would make it entirely painless. I figure it would be a very common swap, so surely enough there's something out there?

If I remember it took maybe using some grease to hold the nuts and washers on the socket. Just curious, I have never paid much attention to the motor mount conversations but what type of mount was on your 307 ? I thought everything back then had the interlocking mounts ?

Bill Koustenis
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post #5 of 10 (permalink) Old Jul 11th, 20, 9:24 PM
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Re: Is there an interlocking 307 engine mount?

I went with these in my car - it's a 307 car that someone dropped a 454 in and just used Energy Suspension mounts on the first time. When I just swapped in my new MJ 467, I decided to use new mounts since I had it out and the old mounts were, well, quite old. And these fit nicely on the factory 307 engine frame stands.

After asking around a little, I was told these are just re-branded Energy Suspension mounts. When I got them - they had "Energy Suspension" molded into the urethane that someone did a bad job grinding off so you couldn't see who made 'em, but they didn't do good enough on one of them and it was easily readable.

If you look at the Q&A, Summit says they are indeed interlocking mounts and will lock if they fail.

https://www.summitracing.com/parts/sum-7731114
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post #6 of 10 (permalink) Old Jul 11th, 20, 9:27 PM Thread Starter
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Re: Is there an interlocking 307 engine mount?

Quote:
Originally Posted by BillK View Post
If I remember it took maybe using some grease to hold the nuts and washers on the socket. Just curious, I have never paid much attention to the motor mount conversations but what type of mount was on your 307 ? I thought everything back then had the interlocking mounts ?
No, the 307 mount is not interlocking. I spent some quality time on the internet this evening, and it seems like the 307 and possibly the 2 bbl 350 came with the "tall mount" type. I guess they didn't think it was neccessary with interlocking mounts on the slowpokes, although it makes no sense to use two different types. I guess the non-interlocking mounts were a few cents cheaper, so they used them where they thought they could get away with it.

As a matter of fact, both my old mounts were broken and I never noticed a thing. No vibrations, no excessive movement or anything. It would probably have been very different with the 383 though. A friend of mine broke a mount in his '69 Mach 1, which resulted in a runaway engine. Luckily, he realized what was happening and turned the engine off, but it could have ended in a very bad way. So I do want interlocking engine mounts.

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post #7 of 10 (permalink) Old Jul 11th, 20, 9:32 PM Thread Starter
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Re: Is there an interlocking 307 engine mount?

Quote:
Originally Posted by lucifershammer View Post
I went with these in my car - it's a 307 car that someone dropped a 454 in and just used Energy Suspension mounts on the first time. When I just swapped in my new MJ 467, I decided to use new mounts since I had it out and the old mounts were, well, quite old. And these fit nicely on the factory 307 engine frame stands.

After asking around a little, I was told these are just re-branded Energy Suspension mounts. When I got them - they had "Energy Suspension" molded into the urethane that someone did a bad job grinding off so you couldn't see who made 'em, but they didn't do good enough on one of them and it was easily readable.

If you look at the Q&A, Summit says they are indeed interlocking mounts and will lock if they fail.

https://www.summitracing.com/parts/sum-7731114
That's probably the same as this then: https://www.energysuspensionparts.co...rgy-suspension . I looked at those earlier today, but Energy Suspension's web site says that "most" of their mounts are interlocking so I wasn't sure.

So how does that backing plate work, I can't see anything that connects it to the frame mount?

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post #8 of 10 (permalink) Old Jul 11th, 20, 9:37 PM
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Re: Is there an interlocking 307 engine mount?

The backing plate is a preload plate. I'm not sure exactly how the interlocking works, but I suspect there is more metal than meets the eye inside of that polyurethane.

Note that the other version of the Energy Suspension mount for the non-307 cars (including big blocks) looks the exact same, except the dimensions are different (tall and skinny vs short and fat), and they say that one is also interlocking.

Edit: google is your friend. Found it. This page describes it (I was right - it’s inside the polyurethane where you can’t see it.)

https://energysuspension.com/motor-a...mission-mounts

Quote:
Originally Posted by Olle View Post
That's probably the same as this then: https://www.energysuspensionparts.co...rgy-suspension . I looked at those earlier today, but Energy Suspension's web site says that "most" of their mounts are interlocking so I wasn't sure.

So how does that backing plate work, I can't see anything that connects it to the frame mount?
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post #9 of 10 (permalink) Old Jul 11th, 20, 10:02 PM Thread Starter
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Re: Is there an interlocking 307 engine mount?

Quote:
Originally Posted by lucifershammer View Post
The backing plate is a preload plate. I'm not sure exactly how the interlocking works, but I suspect there is more metal than meets the eye inside of that polyurethane.

Note that the other version of the Energy Suspension mount for the non-307 cars (including big blocks) looks the exact same, except the dimensions are different (tall and skinny vs short and fat), and they say that one is also interlocking.

Edit: google is your friend. Found it. This page describes it (I was right - it’s inside the polyurethane where you can’t see it.)

https://energysuspension.com/motor-a...mission-mounts
Ah, so it's cleverly hidden then. I'll definitely order a set of those, that will save me a lot of work and aggravation.

I read the Q&A, and somebody made it sound that the preload plate was part of the interlocking feature. So stupid question: What purpose does the preload plate serve?

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post #10 of 10 (permalink) Old Jul 12th, 20, 8:48 AM
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Re: Is there an interlocking 307 engine mount?

Pulled the 307 frame stands and installed the 350 & up stands. Hell, I had nuts taped to box wrenches, I do believe I had 40 or fifty different wrenches sockets , U joints, Scotch Tape, Masking tape.
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