Weistec

Weistec Engineering announces the first CNC port solution for the M156 heads.

Key Features:

• 5-axis CNC machined
• 397.88 CFM Intake flow
• 257.81 CFM Exhaust flow
• Fully assembled, Read to run heads
• Custom ground factory 40mm intake valves
• Custom ground factory 33mm exhaust valves

Heads can add an extra 40-50 HP on naturally aspirated engines, and up to 70 HP on supercharged engines with stock cam shafts.




Please visit our website for further information!

http://www.weistec.com/m156engine.html

CELLryuu

Pretty Kewl. Is there a dyno?

dodger63

Nice $5,000.00 very affordable

_AMG_

NICE!!
You guys are doing some serious stuff with the M156, great work!!

VCA_AMG

Mercedes tax included

Does look like gorgeous work.

GHAZAN

How much for MHP ported heads?

Guy posted the other day with 55 ported heads and said he paid 3k.

Most-Wanted

Looks great but $5k for port work is hard to swallow. Look forward to seeing real world results at the track with these.

blilley18

MHP ones are $4500, but it seems the gains on the Weistec are more. Not sure though because it doesn't list the rwhp, they don't specify which it is.

Most-Wanted

I could justify the $5k if the gains are there but no way would I buy into it going by a cfm number which is like coparing dynos on different days. At the very least do a before and after dyno on the same day, same car, and list the mods. Saying heads "CAN" add whp is misleading. Did yours add 40-50 whp? Where did it add it? What kind of losses where seen if any? Dyno sheet? Im interested but need more info please...

SonnyakaPig

@ Weistec,

How do these heads affect the hp and tq curves? Would you be willing to post the dyno graph? I'd be interested to see what the changes look like.

And did you do your testing for these ported heads with an otherwise completely stock C63?

Thanks.

dodger63

Did I read there website right? There core exchange policy looks backwards? Send them your heads wait 8 days get your heads back? Isn't core exchange mean get the new heads tear down car install send stock ones back within 7 days? Or in I wrong

Sincity

Ditto. You developed your SC system using OEM exhaust manifolds. Can we safely assume your quoted power figures are using OEM exhaust manifolds and exhaust?

Mx_AMG

I wonder if they are going to be as elusive as trying to get answers about the sugercharger system.

msheredy

Flow benches are nothing like a dyno and therefore shouldn't be compared to each other. When an experienced customer is looking for a set of heads they want to know these numbers. You make it sound as if it's a crap shoot on how much these will flow. Also the fact that they're CNC'd means they will have dead consistency throughout each runner and therefore each head.

bmontalban

mercedes tax is awful high. look what you can get for a Ford, NO CORE REQUIRED..

Most-Wanted

That's exactly what I said. You can't compare cfm numbers. A cfm number is a gimmick just for that reason. Most experienced customers want to know flow increase at multiple positions. Don't open a can you know nothing about. I build 800-1000 whp 4 cylinders. I know three of the best head guys in the world and they don't even post cfm numbers their post says heads can make 40-50 whp but they aren't posting any info to support that their heads make 50 whp. Posting a cfm number that can't be compared to another flow bench is also misleading which is what I said. But thanks for confirming my post

Most-Wanted

All I'm saying is more info should be provided. An extra 50 whp would be awesome if that's what they are actually getting.

SonnyakaPig

Assuming stock exhaust (and we don't know which 63 model was used for testing--E63 has better flowing exhaust than C63) how would these ported heads even produce an increase of 40-50 bhp with stock cams?

Are the OEM heads really that restrictive?

Weistec

Thanks for the interest guys. We are currently installing a few sets on various different setups, one being a completely stock C63, the other being a supercharged car with upgraded camshafts. Our goal with these cars is to get hard numbers. The challenge in stating a power number with these heads is the fact that there are many variables that go along with them such as tuning, exhaust, etc.

We also understand the difference in pricing. There are many reasons behind this, and the biggest being risk of damage during the machining process. When machining these heads in the mill, a technician is standing behind the glass watching every tool path to assure a perfect machine. When machining a modular (Ford) head or LS head the machinist typically steps away from the machine. There is just no risk when the head is $400 brand new from the factory.

Please let us know if we can assist with anything else. Thanks.

c32AMG-DTM

More details on the cams, please. Is this car a CLK63BS?

msheredy

I stand corrected. After researching a bit more I came across this good article about flow benches.

Link

Oh and just an FYI you don't need to be a big D in the future unless you're one of those internet tough guys

SonnyakaPig

Thanks for the feedback. Should be interesting to see the gains on the completely stock C63.

Are the cams, blower specific cams?

MB_Forever

How much hp gains (approximately) would you expect this mod to gain on other 63 models?

CLS63 AMG

Sir,

i will get the heads + the supercharge if you will exchange with my heads, and make me a good deal

i have MHP LT Headers
Carbonio Air intake and thinking to change them to renntech
MHP Thermostat
MHP Cams
MHP V3 Ecu tune


what should you do about the tune if i order the heads and the SC?

Weistec

They are not blower specific cams. Other 63 models will have similar net gains to an untouched C63. We will post results soon. Thanks again.