hi Erik, my friend and engine builder Johnny do always use the car headers during the dyno. And they use to work fine. But this time they were little to small. Even Johnny said that. The exhaust fitings in the dyno rig fits car headers better than the marine headers. Thats the reason. Thanks for finding this project intresting. /Mange

Great numbers from the Dyno

I hope you are satisfyed

Congrats Mange...
...I hope to see some pics of the engine in the boat tonight

Thanks Biomech,
I think we going to put the motor in tommorrow first, but we never know.....

here's a little movie...
http://www.youtube.com/watch?v=swJRTd8erh0
(sorry for bad photo quality..)

Hi again! OK, I see. To be honest, I think there should be a significant number of horses to be released with a properly tuned manifold... A few percent (~5-8%) in volumetric efficiency can easily be gained, and that will translated to the same percent in max power, which on this level is quite a lot...

On the other hand, that will only be a "dyno number". In the boat you will already have those horses available since you have what looks like a nicely tuned manifold there...!!!

tonight my buddy Johnny and I droped the engine in the boat. I have alot job to do but it feels great to have the engine there. We had to twist her down!! Its not a plenty of space there.....

Keep up the good work!
Looking forward to see her wet

BR
JesseDC

Mange,eng.looks great in the boat.Got a few dumb questions.That 572,was it a GM crate eng or somthing somone had built?Also what is the comp?How i wish i was on fresh water ware i could use allum. heads and be able to kick up the comp. without having to use 110 racing fuel.When i put my first 540 together with the 13 an half pistons it was like adding 5# boost compared to the 10 to 1s i use now.

hi Mel! She is crate and we had her in my 3 man Pantera last year. I really dont have the comp nr but xx ithink. Since we replaced the pistons (venolia) we are lower than xx now (i dont really know)!

According to GM Perf the C/R is 9.6:1 in the crate 572/620.

Yeep, thats correct. I'll ask Johnny what c/r we have now....I know 8 something...