500 efi aluminum heads
 

Looking for opinions on aluminum or another replacement head for a Merc 500 efi. Not trying to break the bank or have to do any mapping. Just looking to bolt on and go. Is this possible? Are there any gains to be had? Options or opinions?

Thanks

I think the 525 heads are edlebrocks. They are reasonably priced.

I replaced my cracked gm heads with the Edlebrock heads. Need new head bolts but thats about it.

Did you gain anything? Which ones?

Call Bill at Ateco. He has recently put together an excellent kit with Aluminum heads, ARP studs, and more and have been getting 600+ on the dyno.

Though you may not want the full kit, its the heads that are the magic!! Call him at (847)623-2737. At least you'd have great info and proven heads that work.

Kirk

If you want any gains, you have to remap the ECM.

What about the Dart iron eagle heads

The complete kit from Ateco includes:

ATECO/DART Pro 1 heads with REV Severe Duty Stainless Intake Valves, REV Inconel Exhaust Valves, FEL-PRO Head, Intake, Timing Cover and Exhaust Gaskets, MANLEY Pushrods, ISKY Roller Hydraulic Cam, Lifters, Springs, Retainers and Locks, ARP Head Bolt Set, True Roller Timing Set and complete Computer Reprograming.

Have several running aound our area with 620+ HP.

How much?

Be interested in the ballpark cost as well as knowing if the original Merc head covers will still fit?? Trying to look as stock as possible.