jacob502

Just wanted to know what the real deal is with the race ported heads on the 63 AMG. How much is the HP gain, and is it noticable?. (please dont start by making it a price issue, Im only asking for numbers, price is not the issue).

Does the set up require tuning,is there a negative effect on the engine for having ported heads?


Thank you

msheredy

Remember thought that you also need to treat the intake manifold and exhaust manifolds in a similar matter or you won't get the full potential.

In order to get the full benefit of a "race port" you should get revised camshafts and a tune at the minimum to really get the full effects.

If you're truly interested in headwork I suggest talking with a reputable shop and tell them your power goals and then go from there.

The only [concern-able] one that comes to mind is that you'll most likely lose some power off of the bottom end but at the same time increase power on the top end. Porting can change the power delivery tremendously which can be a good thing or a bad thing. There's so many factors like tire size, rear end gearing etc, that plays in that as well.

If your car is stock there are many mods to perform before head porting.

jacob502

I already have an aggresive tune and will be installing LT headers from MBH next week.
what do you mean by treating the intake manifold and the exhust manifold?

MRAMG1

At the bare minimum, you need to gasket match both of them to the head.

Next think about cleaning up ANY casting flashing in the intake and smothing out any tight radius bends. Extrodhone works miracles with intake manifolds.

On the exhaust side you want them to look like a mirror finish.

Again, I would leave the porting of the heads as a LAST mod, certianly not a starting point.

msheredy

Like what MRAMG said, gasket matching or Extrude-honing (I actually forgot about that one!) As for the exhaust side I was referring to installing headers.

Maverick1975

Just out of interest why do you call it an "aggressive tune"? whats aggressive about it as opposed to any other tune?

PetroC63

^
An aggressive tune will have 100 octane race maps.

chrisq

If you find a serious company that will do the job... they will need a second set of heads to destroy. why
The cut the master-head in peaces to look how deep they can port on each aerea of the head.
Then you need bigger (and lighter) valves because you need wider in- and outlets.
At next you should think abot to rev higher . So you need stronger valvesprings and lighter internals for the engine and so on ;-)
Could be a never ending story which can eat a lot of money.

The only thing that would make sense in my opinion is to rev 1000-1500rpm higher.
So you can make maybe 70-100 poney more.

Only porting the head is just waste of money.
For the same money you can can get a sc-kit.

Jakpro1

Good quality head job gotta be upwards of 5k.

5K would get you 33% of the way there to Mr Weistec.

Just watching that SLS kick tail with it makes me wanna jump to that 6.2!!

https://mbworld.org/forums/sls-amg-g...ml#post4709570

jacob502

High octane remapping for use in conjuction with the race gas.

jacob502

Horsepower numbers? anybody....

DuaneC63

Since price is not an issue then you should plan on doing a full build of the motor by an engine builder who has already done several of them and knows the end result. Just porting the heads won't give you the full bang for the buck. So many other internal engine mods would be required. (Back in the day taking a Chevy, Ford, or Mopar engine to the extreme was rather inexpensive. Lots of engine builders around with plenty of experience on these types of motors) Porting the heads requires match porting the intake manifold and headers. To use the additional flow you can get into larger valves, cams, flycut pistons etc. With a modern ECU a custom tune would be needed as well as larger injectors, fuel rails and most likely dual pick fuel delivery pumps. On a MBZ engine this is going to be a price is no object experience. Also plan on having your car down for a few months as all this work takes lots of time and you'd want to engine dyno it when you're were done. Stick with bolt on extenal mods and ECU tunes. Cheaper, faster, and better long term reliability.

splinter

No numbers, although MHP's CNC-machined head pictures posted here...http://www.absolutelydriven.com/foru...ead.php?t=5404

edit
Weistec's flow specs...http://weistec.com/m156cnc.html