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E46 Engine Swaps
Replacing your motor? From direct replacements to more exoctic engines, if it's going under the hood of an E46 3 Series this is the forum to discuss it.

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Old 09-26-2019, 04:37 AM   #1
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My Ride: '98 E46 323i
Year: 98
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M54 Block Bolt questions

For those out there that have done an engine rebuild/upgrade.

I am rebuilding and upgrading my M52TU25B to a M54B30.

I am building it as a hot street engine and looking for around 350hp crank.
The build for those interested is:

12:1 static
CP pistons, hard anodised and coated.
TotalSeal gapless rings.
ported head, fully coated.
CatCams 266/258 or similar.
ID 1050x injectors.
Alcohol injection.
N54 oil pump.

I am going to timesert the head bolt holes and fit ARP2000 head studs(still M10).
Should I do the same for the main cap studs?

Power is knowledge, So share the knowledge!!
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Old 10-01-2019, 09:46 AM   #2
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I have rebuilt an M54 but not with the HP goal you have. I always time-sert the blocks, but haven't used studs yet. I do know the Main Cap bolts are pretty damn sturdy. If there is a failure in your operating assembly it likely won't be there IMO. Certainly use new bolts and tighten to spec.
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