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Originally Posted by Rookie
(Post 4910168)
I like it. Cam specs would be helpful. I'll always opt for better performing aftermarket aluminum heads than stock iron.
I run Dart Pro1's at about 320cc on my 454's @ 585HP and 87 pump gas. Pro 1 320s have a good exh port. 585 is respectable. What RPM? |
Originally Posted by Rookie
(Post 4910168)
I like it. Cam specs would be helpful. I'll always opt for better performing aftermarket aluminum heads than stock iron.
I run Dart Pro1's at about 320cc on my 454's @ 585HP and 87 pump gas. https://cimg8.ibsrv.net/gimg/www.off...ea0edd0ffa.png Here's the cam I'm looking at. The Brodix heads are on my 489 that's currently in my 272. I have Dart pro 1s that are fully ported going on that next couple weeks. The drive is a early version Bravo 1 As for this boat, cruising rpm will likely be around 3800-4200 rpm with the intention of going fast whenever the want is there. |
Originally Posted by Tartilla
(Post 4910173)
Being able to run 87 is always a bonus.
Pro 1 320s have a good exh port. 585 is respectable. What RPM? 5800RPM |
Mine that I have are 310, 320 after the porting
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Eric Weingartner has a video on the Brodix 312s.
They would benefit from a very mild cleanup even in just the chamber lip off the seats. That's a healthy cruise rpm 3800-4200. Less of an issue for the larger ports. The cam looks to be in the ball park @223° int. The GM forged Mag marine engines would peak at 5200rpm with 224° single pattern flat tappets with 0.510 lift. Longer exh duration would keep the hp up a bit after the peak. |
I've watched his videos and got the same info from him and cleaned up the chambers prior to putting them on my 489. If I remember correctly I believe he said that they were an identical head to the 088 casting with improved exhaust ports.
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Originally Posted by Danimal182
(Post 4910284)
The Brodix heads are on my 489 that's currently in my 272. I have Dart pro 1s that are fully ported going on that next couple weeks.
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I have a PP hurricane single plane intake, but I really want try it with the rpm air gap first. But here are the flow numbers done on a 4.300" bore. Thinking of adding 1.8 rockers to get my valve lift to .599" instead of .566 with the 1.7s.
https://cimg3.ibsrv.net/gimg/www.off...ef50c84336.jpg |
Depending on how much time and energy you have I would leave it all alone other than the heads. Then you will know if they really did anything. If you change 5 things you never really know what helped and what didnt :( What kind of power do you think it is making now ?
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