Here we go! blew up a blower motor
 

Stock 454 with small b&m blowers. Got in the boost for 30 second and when I let of she was knocking. Long story short I pulled her out since top end was fine. Dropped her off at my new engine builder guy. There thinking rod bearings by the gander at it. So probably need new rotating assembly. They use eagles rotating kits. I have 049 stock heads. I want to go naturally aspirated work the 049 heads bigger valves etc. Eagle rotating assembly all forged with else brick marine intake and reuse my holley 850 carbs. Bump up the compression and call marine kinetics for a cam. What do you all think?

Sounds like a safe plan - and then you can change your screen name to Reliable Guy

Which number or numbers were the issue? Blowers don't make engines blow up unless the tune is way off but they will bring out flaws faster...

^^^^^^^^^^What he said. Don't blame the blowers for either a bad tune, or assembly issues. If you are using a 174 blower, than I don't blame you for getting rid of it. That's a great blower for a small block or a 454 RV engine.

If you have to buy a NEW rotating assembly, it would only make sense to go with a 4.25 stroke kit, as it really is no more money than a 4'' stroke kit.

Is this a new engine with an Eagle crank? Or, he wants to put a new Eagle crank in the new build?

100% correct about eagle tolerances

The Compstar is a nice piece for the money. A Chinese crank, but finished here.

Scat also makes a nice crank for the money at a price point comparable to eagle. If I was buying a Chinese crank today, it probably be the Scat.