I used this cam in a very mild 540 I built about 12 years ago. It was destined for a very heavy Sea Ray Sundeck with a Bravo 3 drive. So, our goal was a ton of low end torque and a good idle since it was running Stainless Marine exhaust with Captains Call. Running stock rectangle port heads and RPM Airgap intake. It made peak torque of 551 at 3800 rpm and 490 HP at 5200 RPM on my propshaft dyno. It's still running strong.

Bob

To be honest I'm going to build or find a header, and run muffs. all the after markets look the same as the turds I just pulled off. I want to be able to get to the valve train. we will see.

Don't be building any. Most who have tried have failed costly. Lightenings are a nice header also that can be found reasonable.

The Eddie Marine manifolds with the HP riser are $1800


If you use the extreme series valve covers, you can get them off without pulling the exhaust...

I think that this same article was posted in the Do it Yerself section some time ago, but is a surprising read on intakes.
http://www.hotrod.com/articles/best-induction-combo/

getrdunn your rite abought the headers and my budgit is hit, is there a strap on riser that will mate to my stock manifolds on the market ? it will buy me another year

When it comes to marine exhaust manifold designs, I kinda wonder how well the Eddie Marine exhaust manifolds compare to Stainless Marine.... or GIL Marine.... or Hardin Marine.... or Dana Marine exhaust manifolds??? They all look pretty close to the same externally, but do they all have the same internal exhaust port runner design?...or do some have a better flowing design than others with the same exterior appearance?

I meant to add, I'm just curious as to why there is such a big pricing difference with the other identical exhaust manifolds???...they are about $1000 more than the Eddie Marine exhaust manifolds.

They're cheaper.. LOL....

I'm sure the Stainless Marine's flow better..

The Eddie Marines have separate runners almost all the way to the riser, but the ports aren't all that big..

I didn't have a chance to compare different exhausts on the Dyno,
I DID make 630hp N/A & 1020 hp blown with no apparent tuning issues due to the exhaust.

No.