has any one ever upgraded to after market motor mounts are they better built then oem

 

How so?

Good aftermarket elastomer engine mounts are comparable to OEM, and most people use them. L&S and Anchor are brands I've used with good results.

Polyurethane ("poly") engine mounts do last a bit longer than OEM-type elastomer ("rubber" - not really, they're synthetic,) but do transmit more engine vibration to the chassis than the OEM mounts do.

Aftermarket engine brackets are available that use more tie points to the sides of the engine block, and you can reinforce the chassis attachment points as well with a little fabrication work.

The ne plus ultra of engine mounts (but I don't recommend doing this for anything but a dedicated racing rig...) would be to have mount cushion replacements machined from either mild steel (like 10Lxx or 11Lxx) or a decent aluminum alloy (6061-T4 or better, 7075-T4 or better, or most of the 5xxx-series alloys. 2024-series might work neatly for this as well, but I've not tried it...) The catch? There's a reason for the elastomer cushion in the engine mount setup - part of the reason for it to be a "dedicated" racing rig is because it's going to be torn down and inspected much more frequently than a driven rig. Nothing like cracking the frame ears and having your engine drop out on you!

NB: It's wise to have all three engine mounts (two at the engine, one under the transmission) to be the same type and age - all elastomer, or all poly. If one fails, replace all three. Leaving "old" mounts in tends to lead to premature failure of the "new" mount, if you just change the one.