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NCC Forum Home Page -> NCC - Projects and Updates -> Putting my 350 in a 307 car
Post Info TOPIC: Putting my 350 in a 307 car
4-door Chevelle


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Putting my 350 in a 307 car
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reminded me that the engine mounts/frame perches are different! Too bad I remembered that as I was trying to set the engine down. It looks like the easiest option is to just get new 307 mounts? The frame perches look to be a serious b1tch to get out, I got one bolt out and maybe another one but those bottom 2 look to be impossible!

I am not opposed to buying new ones and putting them in but are the 307 engine mounts weaker?



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Darren - Crystal, MN
1972 4-door Chevelle driver/racer
2003 Silverado 1500HD Crew Cab
Lost in the 60s


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I don't think the 307 rubber mounts are the locking style. If you buy aftermarket urethane mounts, they should hold, but use a urethane trans mount too so you don't crack another case.



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Mitch D.   River Falls, WI

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1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS/RS 350 M20
SteveS


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I looked this up not to long ago.  64-67 BB and SB stands were different because of a saftey lock on the BB. 68-72 BB & SB were the same except for the 307 that was wider and taller than the others. But the motor mounts were different also so they net out the same height.  From what I read it doesn't matter which you run as long as you have the matching motor mount.  I still have 307 frame stands in my car and used energy suspension 307 motor mounts with my last 350 and will reuse them with my LS1. 

Mounts

 



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Steve S. - Fountain, MN

 

1972 Chevelle - 383 stroked LS1/4L60E - SOLD!
SShink


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Now this just goes to show that you never know everything about Chevelles!  I've swapped many 350's to BBC's, and never even thought about this.  I had a 307 in my first car ('71 Malibu) and didn't even realize the motor mounts were different. 



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Stan S.-Twin Cities 'South Metro'

1972 Malibu Convertible 2nd time around 

2001 Mustang GT Convertible 

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4-door Chevelle


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When I pulled the 307 out both motor mounts fell apart so that thing was just sitting in there. I did find stock replacement mounts for a 307 but I should probably try to upgrade them a bit.

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Darren - Crystal, MN
1972 4-door Chevelle driver/racer
2003 Silverado 1500HD Crew Cab
Chris R


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Cant you get the frame mounts from your old car and use new mounts for the engine side?



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Chris - Ramsey, MN.

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4-door Chevelle


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I could if I was in the mood for a serious frustration. I picked up stock 307 motor mounts today for $6 each and now the engine is sitting where it is suppose to. I am inclined to put a chain on the drivers side just in case.

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Darren - Crystal, MN
1972 4-door Chevelle driver/racer
2003 Silverado 1500HD Crew Cab
Chris R


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So the engine is in then? If not, its better to use good eurothane mounts then try to replace them when they break.



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Chris - Ramsey, MN.

Dear Optimist, Pessimist, and Realist.

While you guys were busy arguing about the glass of water. I drank it!

Sincerly,

The opportunist.
4-door Chevelle


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Yes, the engine is in with the 307 mounts and I bought a new mount for the trans while I was at it.



-- Edited by 4-door Chevelle on Saturday 2nd of April 2011 11:32:02 AM

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Darren - Crystal, MN
1972 4-door Chevelle driver/racer
2003 Silverado 1500HD Crew Cab
Lost in the 60s


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4-door Chevelle wrote:

I could if I was in the mood for a serious frustration. I picked up stock 307 motor mounts today for $6 each and now the engine is sitting where it is suppose to. I am inclined to put a chain on the drivers side just in case.

The chain is an absolute must with those non-locking rubber mounts.

 

 



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Mitch D.   River Falls, WI

Lifetime member of the "Cars apart Club"

1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS/RS 350 M20
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