572 Indy block with Indy heads headed to the dyno. Best Machine built the long block, we added the Wilson EFI intake and the billet dry sump pan. Should have it on the dyno next week and then it goes into a '67 Belvedere for some drag racing come spring.

Heads...-1's or 573-13?

572-13 heads

The ends of the heads are machined flat.
The EZ heads are done that way.

I like these dyno posts.
Looking forward to more details on the engine. To put the dyno numbers in context.

Interested in the dry sump setup, any lifter valley scavenging?

Correct, Big EZ heads, 325 cc. Compression is 14.5, cam is 280/296 at 050. We'll run it with 2 inch dyno headers. Throttle body is a Holley 2000 cfm with a 4500 bolt pattern. Intake is a Super Victor fully ported by Wilson. T&D rocker arms, Callies crank, Callies rods, Jesel belt drive.

Sounds like a powerful combo. I would love to see back to back numbers with larger headers more suited to 572 CID. How long are the dyno headers?

Is it too early for me to guess 920 HP? But the small headers may reduce peak HP.
From Indy web site for the Big EZ: CNC porting 325cc runners, 370 CFM at 0.700"

2 inch is the biggest Mopar header we have in the dyno room. The headers that fit the chassis are bigger, I think they are 2.25 but they don't fit the dyno. The dyno session is mostly used for confirming the engine is good to go as well as dialing in the EFI tune.

I'm not sure on hp so it will be interesting. I pushed my old 514 with EZ heads up past 900 hp a few times and it had some of the same parts. We used the 2 inch dyno headers for those pulls as well as the same intake and throttle body combo. My heads were a little big smaller than these heads and of course I was giving up almost 60 inches to this combo. The 280/296 camshaft is way different than anything I ran. Most of my testing was with a single pattern cam or a very small split of 4 degrees. I never ran anything with 16 degrees split like this one has. I expect this engine to make more than 900 hp but who knows, the cam and the headers might not get along well enough for that to happen.

It’ll be interesting to see how that cam works at the top end of the curve.

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I bet it will nose over about 6800 rpm? May end up at 880 hp? But make great torque from 5000 up.

Yeah I have no idea. 16 degrees of split is outside of my working knowledge. I ran a 280/286 in my 514 as well as a 282/288. Both of those cams worked pretty well in that engine. This is a small exhaust port so the extra duration might be what it needs. I might have been leaving power on the table with one six degrees of split. We should have numbers in a week so we'll see what they show.

Do you expect the large duration split to improve or reduce top RPM power?
I do wonder if the "small" 2-inch dyno headers (which may be longer than 30"?) will reduce the top RPM power.

I don’t know that I have an “expectation” on what it will do.
This motor has slightly bigger heads than a 580 we had on the dyno a couple years ago.
It also should have better oil/windage control, a better intake manifold, and more throttle body capacity.
The one here had a couple more degrees of intake duration, but less split.
It didn’t make anywhere near 900hp, but we weren’t expecting it to either.
Peaked at 64-6600, and didn’t really drop off till 7k(down 20hp).

I’m interested to see where the TQ peak occurs, and then how flat the HP curve is at the top end of the pull.
Basically....... can the big split help cover up for the smallish intake/exhaust ports for that displacement?

If it had “big” heads, I’m sure that trend of the extended top end would be there....... but not sure what to expect with the smaller heads.

When the induction isn’t the cork in terms of where the peaks should occur, the big split can really help move the peaks nicely up in the rpm band.

2" Headers are going to hurt HP on the dyno - we have seen more than 30+ HP loss with the smaller headers going from a 2 1/4" to a 2" to 2 1/8" stepped TTI header - I can also tell you from experience those heads did not work well for us with that cam spec on the exhaust side. Should be interesting to see what it makes - Are you going to run a vacuum pump ??

It has a dry sump oil system now

Loaded up and ready to go.

Who specc’ed the cam?

Can you give the complete cam specs ? Maybe show the cam card . Gary

If Best Machine built it I'm betting they came up with the cam grind.