Question about Holley LS swap frame mounts

[ssn696]

When mating to the factory mount locations, know that GM only used three bolts. One corner of the legacy motor mounts always hung over the crossmember edge.

The mounts in the link below are not factory, but they're in the factory Chevy locations.

Motormounts

Hey guys, just looking for some opinions on Motormounts. I've had a very hard time to get the OE style mounts to line up on my Malibu wagon. Got them in after a fight lol. Couple years later they need replacing, trying to do the same again but now I just can't get the motor to line up. I was...

gbodyforum.com

 

[oldsmobile joe]

When mating to the factory mount locations, know that GM only used three bolts. One corner of the legacy motor mounts always hung over the crossmember edge.

The mounts in the link below are not factory, but they're in the factory Chevy locations.

Motormounts

Hey guys, just looking for some opinions on Motormounts. I've had a very hard time to get the OE style mounts to line up on my Malibu wagon. Got them in after a fight lol. Couple years later they need replacing, trying to do the same again but now I just can't get the motor to line up. I was...

gbodyforum.com

yes, this is correct. the pic in the above link that ssn696 provided shows positioning of mounts on frame for a small block chevy.

ls motor with holley mounts also use 3 bolts per mount. but the mounts are set back compared to the sbc location. please reference holley instructions for ls mount locations.
my frame was an early edition, '79, so i needed to elongate the upper rear bolt holes. i used a straight edge and scribed lines that extended past the factory hole so i knew how far to extend the holes and keep them in the same plane.

 

[Tony1968]

 

[houston_t]

Ok got it. Didn’t know I had to go online for instructions

 

[Tony1968]

Merry Christmas to all..

 

[oldsmobile joe]

got it. here you go from the holley site

SWAP ENGINE/TRANS PREP:

1. Carefullyremovethefollowingcomponentsfromtheengine:sparkplugwiresexhaustmanifolds/O2sensors,wiring harness/computer, MAF sensor, starter motor/plate and dust covers, A/C compressor and bracket, the oil dipstick/tube, and engine mounts/brackets.
2. Cleanandpaintpartstobere-used,ifdesired.
3. Secureengine/transassemblytoliftingslingandenginehoist.
4. AttachtheleftandrightsideHookerenginebracketstotheengineusingthesuppliedM10flatheadscrews.

ENGINE/TRANS INSTALL:
1. Install a new set of clamshell engine mounts (aftermarket rubber replacement clamshell mounts, or the Hooker/Holley clamshell mount cages and poly inserts previously mentioned on page 1) onto the vehicle chassis as shown in Figures 1, 2 and 3 below.

 

[oldsmobile joe]

be very careful when placing motor in car. if you have a/c heater box, be care that the right valve cover doesn't damage it. or remove valve cover while engine is being installed. i ended up trimming the ignition coil bracket mount closest to heater box as a precaution. its a tight fit.
also, it is recommended to install trans after motor placement. others may chime in on this, but i was fortunate to perform mine at work on a car hoist and transmission jack.
it might be possible to install trans and motor assembled if the front clip was removed, or a/c heater box block off plate is used. like i said, others may have more info.