Opinion on Merlin III Alum Heads

cal · 11-15-2010, 11:32 PM

Hello All
Looking at a 555 BBC It has Merlin III Alum heads on it. I don't see the Merlin Heads being used that often. It Dynoed @ 800 HP .
I really don't need that much HP but It'll be nice to have, just incase. LOL

Whats your opinion on them?

Are they a good head.

Cal
HR 177X

Tim H · 11-16-2010, 07:54 PM

I also am interested on any feedback about these heads. I am considering purchasing a set of the 310 cc heads and need the stock exhaust port location they offer.

Bill Baer · 11-19-2010, 03:30 PM

I haven't seen a pair of Merlin aluminum heads but 800 hp from a 555 is a little on the weak side they usually are in the 900-1000 hp range with conventional heads I have utlized brodex and BMF heads the cnc ported BMF heads on my 540 made 890hp on the dyno and on my engine builders 567 they were over 1000 hp on one dominator. Granted there are a lot of factors involved in building horsepower but one of the biggest factors is the ability of the heads to provide the correct air flow, velocity, swirl and air fuel mixture homogenization.
But as I mentioned there are alot of factors affecting horsepower perhaps with a cam change or more compression etcetera the melins could produce simular results. In my experience the BMF heads work well.

Just my .02 worth.

Bryan Gillespie · 11-19-2010, 06:28 PM

spend the extra $ and get the brodix , the bigger the better.
(I have a 555 that makes 930 hp) my .02

11-15-2010, 11:32 PM	#1
cal Member Join Date: Mar 2007 Location: southern md Posts: 370 Likes: 39 Liked 30 Times in 17 Posts	Opinion on Merlin III Alum Heads Hello All Looking at a 555 BBC It has Merlin III Alum heads on it. I don't see the Merlin Heads being used that often. It Dynoed @ 800 HP . I really don't need that much HP but It'll be nice to have, just incase. LOL Whats your opinion on them? Are they a good head. Cal HR 177X

11-16-2010, 07:54 PM	#2
Tim H VIP Member Join Date: Jan 2007 Posts: 1,010 Likes: 898 Liked 430 Times in 142 Posts	Re: Opinion on Merlin III Alum Heads I also am interested on any feedback about these heads. I am considering purchasing a set of the 310 cc heads and need the stock exhaust port location they offer.

11-19-2010, 03:30 PM	#3
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	Re: Opinion on Merlin III Alum Heads I haven't seen a pair of Merlin aluminum heads but 800 hp from a 555 is a little on the weak side they usually are in the 900-1000 hp range with conventional heads I have utlized brodex and BMF heads the cnc ported BMF heads on my 540 made 890hp on the dyno and on my engine builders 567 they were over 1000 hp on one dominator. Granted there are a lot of factors involved in building horsepower but one of the biggest factors is the ability of the heads to provide the correct air flow, velocity, swirl and air fuel mixture homogenization. But as I mentioned there are alot of factors affecting horsepower perhaps with a cam change or more compression etcetera the melins could produce simular results. In my experience the BMF heads work well. Just my .02 worth. __________________ Bill Baer 3391 SC, 339B SC, QR

11-19-2010, 06:28 PM	#4
Bryan Gillespie Banned Join Date: Dec 2006 Location: Maryland Posts: 456 Likes: 0 Liked 0 Times in 0 Posts	Re: Opinion on Merlin III Alum Heads spend the extra $ and get the brodix , the bigger the better. (I have a 555 that makes 930 hp) my .02