What HEADS would you select? On a 2K budget.
 

My current setup is 454 stroked to 496 CI
781 Large Ovals with original size small valves.
118 CC chambers. With SRP pistons 9:1 compression ratio
Comp Cam Extreme Marine 226/236 @ .050
BG Sea Demon 750 DP
Edelbrock Performer Intake
I do not want to spin this over 5,500 RPMs
Last year after spinning a bearing(long story, stupid mistake) :( I stroked it to a 496 and only gained 100 RPMs same compressing rato, cam heads etc.
I obviously have a bottle neck somewhere, and I am thinking the heads?

Edelbrock Oval Marine Heads 110CC
290 Intake Runner. What would this raise the compression ratio to?
I am guessing around 9:6.

Dart Iron Eagle. 119CC chambers, 305 Intake runners same size of valves as the Edelbrocks. Probably flows better out of the box. These can be had for about $1,500.

Any other IDEA’s

Thanks in advance for your input, and based on it will determine what I will purchase in the next few days.

Re: What HEADS would you select? On a 2K budget.
 

I'm leaning towards changing the cam. Can you give more info on it, hyd.flat tappet or hyd roller? Since you have small ports and probably good torque, I'd put in a Crane 741 or the Merc 525 efi cam. Also get a Dart or Merlin single plane intake.

Re: What HEADS would you select? On a 2K budget.
 

Bear in mind that 91 octane will be the max pump fuel available from 2007 on, if the new EPA regs go through. I read this in another thread about the 800hp NA 572.

In any case it's worth considering, 9.6-1 should be OK with aluminium heads.

Re: What HEADS would you select? On a 2K budget.
 

How about the new Dart Marine Aluminum heads?
I think they are right at 2K.

Re: What HEADS would you select? On a 2K budget.
 

1BIGJIM, I used Canfield with 119cc chambers and 310cc runners on my 496 stroker. Not sure how they would compare to others since these are the only heads I have run on this engine. I am running 10.2 SRP's and a bit more cam than you and they seem to work great. They are marine version (coated/anodized) and were $2k.

Re: What HEADS would you select? On a 2K budget.
 

The cam is a COMP 270 Extreme Marine
hyd.flat tappet
544 547 Gross Lift
112 center line
Adv Max RPM 5,800

Re: What HEADS would you select? On a 2K budget.
 

That's what I suspected. You don't have enough cam for your cubes. That cam is similar to the Merc 420 cam that was rated for 5200 max on a 454.http://www.cranecams.com/?show=brows...tType=camshaft If you have the money do cam and heads. On a 500 cid engine, my favorites are Canfield 310 rectangular.

Re: What HEADS would you select? On a 2K budget.
 

That cam looks very similar or milder than the one that I have. The duration and lift are almost identical and its on a 114 center line. What am I missing?

Re: What HEADS would you select? On a 2K budget.
 

I'm saying that Merc used that in a 454 with good idle and warrenty and now you're using it in a 500. It's too mild for what you want to do. You need to do a cam change as well as a head change. An engine is a system. All parts have to work together and produce power at the same desired rpm. Look at my first post.

Re: What HEADS would you select? On a 2K budget.
 

TTT :D