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.

Not doubting your builder, however eagle stuff needs to be gone over and not taken for granted. Their forgings are comparable to most all oversees 4340, however they often have tons of machining issues with tolerances being off. For this reason, I just said f it, and went with Callies Compstar. The extra money I might have given the machinist to make it right was money well spent on a better final product IMO. Not saying eagle is crap, just make sure your guy is thorough. Plenty of guys run their product and are happy.

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

Sounds like he wants to do eagle rods/crank as his builder prefers said brand.

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.

Ya know I was going to run a s**t bottom end until their sales/tech dept irritated me by badmouthing Fluidampr, and blaming them for breaking crankshafts etc etc, albeit with ZERO data. They even state other "elastomeric dampers" are a no no. It's on their website. If you do some research, you will find they have a vested interest in a certain damper brand. Weird huh?! I've done quite a bit of research, and have run Fluidampr prior, with excellent results. This approach they seem to have, put a bad taste in my mouth.

Also, Callies is taking essentially the same import 4340 forging(however they state theirs is certified AISI 4340) and machining it on arguably some of the best equipment in the business. Didn't hear them state anything beyond "run a good SFI damper". The Compstar rods make my other rods look pretty pathetic as well.. But as with anything, we all have our preferences. I looked at the 100% USA cranks, and for under 1,000hp I think they are a huge waste of money. No reason to overkill something to that degree, then try to defend it with "purchasing patriotism". Again my opinion.