I'd think it would make 700 hp. You have better heads than my 470 and more compression. Your cam is similar to mine. Your headers aren't as good as mine but that shouldn't be more than 10 hp. Not sure about your oil pan, might not be as good as mine but maybe only 5 or 10 hp. My intake manifold is better than yours and I have a few more inches but it should all even out at around 700 hp with a correction factor of 1.00.

for the fun I like your baseline carb Demon RS next pick would be the Holley ultra hp/xp

688hp 652 torque on the demon baseline carb

705hp 667 torque on the Holley ultra

you mentioned 93 octane fuel my engine program shows that it needs more octane, at least 105

And if you have time it shows that it might like the cam installed heads up at 108, instead of advanced to 104.

The ramp rate the dyno guy pulls the engine at will affect the HP numbers as well. I used 600rpm per second ramp rate for the pull.

A few tid bits.....

Water temp will be in the 160's for all the testing.
Weather is supposed to be pretty nice this weekend, so air temps would be mid-60's/70's.
The dyno exhaust isn't really "open".
There are 5" pipes coming off the collectors going through the wall, where they attach to tractor trailer mufflers.
Testing will be done at a 300rpm/sec rate.

Provided everything is still going smoothly at the end of the session, we'll take the "best" carb/spacer combo and make a cold water "bonzai" pull to try for "the big number"....... But we won't use that run for "scoring"
How low I can get the water temp will depend on how many runs we have made up to that point, and what the temp of the water in the storage tank has gotten up to......... But I'd expect to be able to get it down into the 110-120deg range.

The cooler temp is usually worth something...... But not always.
I think it would be on this motor though.

How many gallons is the water tank.

FWIW, I'd LIKE to post what I THINK it'll make, and what I HOPE that it makes... but I won't.

First, I don't want to influence anyone's predictions.

Second, if it's an underachiever and doesn't make nearly what I think it should... well, that's for me to think over afterwards.

Good luck ! A Day at the PRH dyno cell is loads of fun and a real learning experience.

Baseline WAG ; 645hp@6900/605tq@5200

Best pull : 658hp@7100/617tq@5400

750 zillion hp @ 7200 thousand billion rpm and 650 gazillion tq @ 5000 trillion million billion rpm!!!!!!!

There's always an optimist around somewhere!

Y'all have fun with this. Unless something goes t!ts-up between now and Saturday night, this is my last post on this thread until I have some results to show.

Lots of good guesses so far........ And a pretty big spread from high to low, so I'm sure someone will be pretty close.

690 hp 6300 590 tq 5300 base
703 hp 6300 595 tq 5300 best

FYI if he is using the latest version of windyn, it has an inertia correction factor, if set right, the sweep rate will not mater, 600 rpm vs 300 rpm vs step will lay right over the top of each other.

Explanation: the inertia correction factor is used to correct for the loss of torque as you accelerate the engine internals and related dyno equipment that is connected to the crankshaft. Without this correction you will get different torque reading @ each sweep rate.


Joe

680Hp@ 6700 and 610Tq@ 5500 base carb.
695Hp@ 6800 and 615Tq@ 5700 best carb.

Base carb 665Hp@ 6850 590Tq@ 5200

Best carb 680Hp@ 6950 600Tq@ 5300

Peak torque cannot and will not occur at that RPM with the engine specs listed. If it does-dyno is screwy. J.Rob

Don't forget to shoot some video with your cell phone.

The big dyno day was yesterday.
I told Brad I wouldn't post up any numbers.......but I can say the motor ran well, and we made I think it was 28 pulls without any "incidents".

I'll also reveal that we tried the "cold water" pulls with two different carbs and got nothing out of that either time.
The cooler temps thickened up the oil enough(8-10psi higher oil pressure) to offset any gains from having the heads and intake cooler......so it was a wash.
In hindsight, I probably should have tried a run with "lowered" water temps, instead of the relatively cold temps I tried it at(105-110).

He's driving back home today........so I'd think there should be some results posted tonight.

I run all of my dyno pulls with 180 degree water temp these days. I used to try and run cooler but eventually just decided it was easier to run everything at 180. I usually try to get the oil to 180 also but it tends to vary more. Sometimes the first pull is at 150 oil temp and then after a few back to back pulls it will get up into the 200 range.

Glad to hear it ran good. 28 pulls in a day is a lot of work, especially if you are swapping parts and then trying to get the engine pulled down and ready for the road.

I had a really mild 505 on the dyno last week.......the cold water test on that was a 14tq/8hp gain.

I've seen it change the numbers on a 700-800HP BBC by about 25hp.

Just depends on what it is.

Greetings from I-81 south of Scranton, PA. Mike ("THESHAKERPROJECT") is driving, so I'll try to post some results from my phone.

Baseline Race Demon 1.42" v, 1/2" open spacers, 34* timing
- 654.5 at 6100, 594 at 4900
- Air-fuel ratio getting progressively richer across 3500 - 7200 test range, even after opening the MABs

Can you post a couple tq# from 3k rpm?THX!