[V8 4.2]

Here are a picture from 5 brocken stock Maincaps....(i never see this before...)

My Engine Builder say ´s the Engine musst be seen a large amount of over RPM´s
What do you think?

here some Engine facts:
New Building with Carrillo H-Beams and JP Piston in first overbore, ACL RaceBearings
for Main and Rods, Eingine were running 3700KM without problems with GT42, AEM, 264 Cams, max 8500 RPM, and E85 (Etahnol)

Pistons and Rods are not damaged!!

 

[Spdwrx_buffa]

COUGH**hacksaw**COUGH idk what could have done that but it doesnt look good

 

[DR. RaceBoost]

Improper torquing sequence?

 

[V8 4.2]

Hello
What do you mean with this:

Improper torquing sequence?

i don´t understand this ....(bad English)

You think the maincap bolts were not right tighten?(LBS or in Germany NM)

Thomas

 

[FLINTSTONESKID]

there is no way that removing the caps could have caused this damage, i would also go with the "theory" that it was improper torquing of the main cap bolts. i think that there is evidence here of what caused it by the fact that most of the damage is located in similar places on each cap. dont let your builder bullshit you and blame it on your driving. i would also consult the manufacturer as i bet they have seen this before and might be able to help you.