Motor Mount Adapter drawings

[DannyA]

Does anyone have any drawings I can use to make my own motor mount adapters for the standard 3 bolt mounts to the 4 bolt LS pattern. It's for a 1995 k2500.

Thanks,
Danny

[beertestr]

None handy, but here are some dims..

3-bolt small block pattern. Top holes are 3.48" apart. bottom hole is right between the two top holes, 3.098" down.

GenIII-GenIV pattern

4.4 wide, 3.07 tall.

Lay these out, and move the patterns relative to each other until you get the motor fore-aft position you want. Keep in mind that the adapter will move the engine side brackets outboard a bit. If you want to get the engine mount hole to lineup, you open up the hole on the SBC engine side bracket, but it won't fit on the mount tabs right, so docking the motor down will be trickier. If you move the frame side brackets down the same amount as the adapter bracket thickness, then it will line up very well.

Finally, you do not HAVE to use all 4 bosses on the side of the block, the Corvette uses only 3 per side, with an aluminum bracket... I have never seen one break. This gives you some more freedom in placing the engine..


Most of the generic brackets share the bottom 3-bolt hole with the bottom front 4-bolt hole. I didn't like that as it puts the motor ~1" further forward, which would have meant I would have had to lengthen my driveshaft. So I made V2.0 of my brackets and slid the motor back. With the truck intake, I have tons of room to the firewall on my 93. It could have gone further rearward.

Here are some pics. Use my dims above, as the ones below are little off. no biggie if you big oversized holes but..