And be sure to quiz them on the maintenance routine.

How to avoid being wrong: don't say anything

More of my worst mistakes

I would be looking to sell that block and upgrade to an aluminum block. So many wives tales exist about aluminum blocks still. Did the guy who told you the cylinder will move around also tell you that aluminum rods can only go 50 passes in a bracket motor too?

Al, this isnt my 1st rodeo. Been racing since the early 60's.
I'm going 8.30s in my little small block Dart.

I thought a good aftermarket iron block was supposed to be better and handle hp better than a aluminum block. i guess that information about cylinders moving around is a wives tale then? Then why do they say you make more hp with a iron block over aluminum?

This kind of information is beyond the realm of most on here. Your looking to make over 2000 HP I would be calling Block Manf (Century ETC ) or someone like Best Machine, Steve Morris or Proline, ETC
I don't want to sound condescending or anything but your looking for info or experience with this much HP your not going to find it here, or your going to get a lot of opinions that really aren't accurate.
I know ,..... flame on ,...… LOL

I agree with that...... and would take it one step further.

Preferably you’d be looking to talk with a shop that has a known history of reliable success making 2000hp+ with Megablock based engines.

All i'm asking is hp rating of a mega block. Nothing more, nothing less. i can handle the rest.

There is no such rating. It is an improved version of a factory block. So, improvements are there to make it more resistant to mistakes in your tuning. I guarantee there are guys who will break these blocks with 500hp through mistakes in assembly or tuning. Does that mean that they should be rated at 500 hp?

What he said.

Yea, that's in the KB arena, or Indy??

Seems like a reasonable question. I don’t recall ever seeing any hp ratings on any of the Chrysler race blocks. Sounds like fun project!

I had cap walk in my megablock(vintage 2000?) At just over 850 hp. That is why i suggested getting in touch with guys that have been down the road you want to travel. Life is a lot less painful when you build on the knowledge and success of others. I have a lot of scars to prove it😒

Interesting, cap walk on cross bolted mains.

I got evidence of cap walk on a 6 bolt main KB block after a crank trigger went south Bearings were not happy either Saw it a lot more on a Mega block 780ish HP 528.

An Iron block, and 2400hp,,,,

The biggest enemy of any block is tune up. A bad tune can break most anything.

I've personally never seen an aluminum water block take 2400 without serious cylinder wall movement. Maybe the new KB might, but it might not just as well, I haven't seen that. My own experience with older water KB (I think the best water block ever made for chrysler) is somewhere around 1800hp you start to lose cylinder seal. That doesn't mean you cant keep going, you just start to see the evidence that things are on the move. From there it takes a disproportionate amount of whatever your choice of power adder is to gain power. Everything is mostly linear before then. The KBs I have now, when pressed beyond 1800 at least return to normal below that. Meaning power is still consistent after going above 2000. Indy blocks have always lost, and lost the more you pound on them from my experience. I really hope the new KBs will be better, but even if they are the same, and no better, they'd be my choice for your intentions. Of course a billet of any make would have no issues in that range.

As long as I'm blapping my mouth, the other thing to deal with is the entirety of the car that has to deal with 2400hp.

You got my interest, if suppose I have a mega block that was used with super charger (no idea how much hp) what would I look for as problems?

I am happy you have been 8.30's with a SB in a Dart, what does that have to do with the question at hand. Or are we now comparing resumes? If you want to deal with the glorified stock block arrangement that is a megablock at 2400 HP then by all means do it and let us know how it turns out. The cap walk issues in Megablocks are pretty well known. Look at what blocks are in cars making that kind of power and report back to us. After all not your first rodeo..

Like I said before, I have no experience with BBs and especially a megablock.
That's why I am asking here.
I always thought aftermarket iron blocks made more hp than aluminum.
I guess I was wrong.

When you’re into these kinds of power levels....... it’s not so much about what the block can “make”....... it’s about what I can “take”.

The Megablock was not designed to be the ultimate high end race engine foundation.

It’s an updated, reinforced version of a stock block.

If 2400hp is really the target...... I’d be seriously considering a billet block.