I hate to ask this since I looked up this a few years ago to put an M103 on an engine stand and found the answer on this forum. But I cannot seem to find the answer today.

What is the bolt size and thread pitch for the bellhousing on an M103? I plan to go to the hardware store and buy 4 bolts for an engine going onto an engine stand.

If I had to guess I'd go with 10X1.5

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

All i find is M10 lock up to 56 NM

Sorry to thread-jack but do you support the engine with anything else, or have you found that the m103 mounts to a stand fine without need for additional support? I’m looking for a stand to put an m103 on and found a thread suggesting the need for extra support. Seems like some use a bottle jack. Thanks.

I have an M103 on a 1000lb engine stand at the moment. No problems with needing any extra support.

Your guess was right. Confirmed that it was M10x1.50

Thanks!