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#1
03-27-2009, 10:48 PM
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Motor mounts
I need some help. I don't know what type of motor mounts I need to install a pontiac 400 motor into my 73 firebird. I am removing the st. six and have been told I will need to replace the frame rail mounts for the engine and purchase the correct motor mounts to install it. below or attached are two mounts from ebay both say they will work but they are different.
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#2
03-27-2009, 10:56 PM
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The ones on my '73 look like the ones on the left.
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#3
03-27-2009, 11:31 PM
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motor mounts
do they mount to the frame rail?
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#4
03-28-2009, 12:07 AM
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I just had a look at it. It's burried pretty deep, but it looks like it mounts to a bracket.
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#5
03-28-2009, 12:15 AM
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Yep, i think I need new frame rail mounts plus the motor mounts on the left
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#6
03-28-2009, 01:33 AM
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There are two plates that bolt to the front crossmember.
Any 70-74 Firebird with a Pontiac V8 will have them. The insulator cushion mounts in your first picture bolt to each side of the block. Once your engine is in place (cushion mounts sitting in/on crossmember plates) there are two LONG bolts that go through BOTH & tie the whole thing together |
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#7
03-28-2009, 12:06 PM
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motor mounts
Do you have any or know of someone that might have them?
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#8
03-28-2009, 02:02 PM
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Anybody that's parting out a 70-74 V8 firebird would be a good place to start.
The crossmember plates are a bit tricky to remove with the engine out |
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#9
03-29-2009, 08:43 AM
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mount
Why are they hard to unbolt? or getting them in the new car correctly?
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#10
03-29-2009, 09:29 AM
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Quote:
The nuts are inside the crossmember and are accessible thru the lower control arm cutouts in the crossmember. It can be done tho.
__________________
Bud Lawrenceville GA 73 Firebird 96 Impala SS |
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#11
03-29-2009, 03:38 PM
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Quote:
(I guess I didn't proof read that one) |
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#12
03-29-2009, 04:37 PM
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73BlueTA,
Here is a pic of what the plates look like installed. BTW, now that the subframe is back from the powder coaters, I cant find my plates. Ive ripped the garage apart and cant find them. You werent at my house recently were you?
__________________
Bud Lawrenceville GA 73 Firebird 96 Impala SS |
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#13
03-29-2009, 10:30 PM
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LOL No I don't even know if I could get those off! Thanks fpr the info. Once I have the motor out and the new motor on my stand I'll get the parts.
Dw |
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#14
03-29-2009, 10:32 PM
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Am I going to have to drill holes or weild the plates on?
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#15
03-30-2009, 08:07 AM
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Your subframe should have the holes already. I recently went through this myself. A previous owner had installed the later style mounts on my subframe. One thing I found out is that not all of the 70-73 subframe mounts are the same. I have an extra set that wouldn't work on my subframe. I can send you a template and you can see if they will fit yours. There is a slight variation on the hole placement between years. Send me a PM with your e-mail address, and I will send you the template I made.
-Tom |
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