cant find bolts for my AAZ

[paolomarks]

Looking around abit I've found an ARP #204-5402 but that seems to be for the shorter 65mm length.  Saw somewhere that a ARP #201-5001 for BMW 2.3 liter might work?  Any confirmation on this.  Paolo

[paolomarks]

 So I gave ARP the specs on the longer AAZ mains and they replied that they have none for that application.   I went ahead and bought some socket head cap screws.  2 questions for those of you who have used SHCS for the mains:  Do you install washers between screw head and main caps?  and what do you torque them to?  Thanks,  Paolo.

[theman53]

Last time I didn't use any, this time I used a grade 8 washer under mine. I used a torque value about 20% more than stock, since the 12.9 SHCS is about 25% higher tensile strength.

[paolomarks]

Thanks ,  Paolo

[ToddA1]

Bumping an old thread....

I just pulled the main bolts to check out the bearings in JUST the caps. I did not pull the crank. The shells looked fine and rotating the crank, the same proved correct for the journals.

Anyhow, I have 65mm bolts with no shoulder under the hex head. I'm guessing these may have been replaced...?

Is the ARP 204-5204 a cure or a bandaid for the potential to crack the caps? 
Would retapping the block be a better long term solution? 
Are 65mm 12.9 bolts a comparable fix?  i do understand that studs have better clamping ability.
I don't plan on building a crazy engine.

-Todd

[vanbcguy]

No shoulder = stretch bolt, they are single use.

A set of factory AHU bolts will fit fine, are affordable and will do the job safely.

[ToddA1]

Aren't the AHU bolts 80mm?  Not looking to retap the block if I can avoid it.

-Todd

[ToddA1]

I guess I didn't need to bump this thread.

I went out, reinstalled 2 main caps and grabbed a sliding caliper. Shot it down the bolt hole and measured slightly over 78mm. Did this a couple times. Apparently, my block had the shorter bolts installed for no reason.

Question... Is the 80mm that's mentioned an approximate bolt length?  I definitely don't want the bolt bottoming out.

-Todd