The 55Kompressor camshafts are already quite good. One person working for a cam shop did post up pictures in this forums some years ago with its specs - even the SLR/Kleemanns were not that much better, just very mild changes.

I doubt that just porting/portmatching will result you in 60RWHP, especially not with a stock motor.
With bigger valves on a already very powerful, high boosted engine, i'd say "maybe".

 

Without an aggressive cam how did you gain that much hp from the heads?

 

He did say big valve ported heads. 60whp is a lot from just that. But, big valves on a boosted motor does help quite a bit. Still it sounds on the high side for just that. But, very impressive indeed.

The thing is if you go big valves you don't want to go radical on the cams. Because, they could very easily come in contact with each other. Adjusting the cam timing with adjustable cam gears would definitely help increase power and move the power band where you want it.

CNC ported heads with bigger valves, stock or mild cams with adjustable cam gears sound like a good 40-60 whp on our engines. Ive seen similar gains on other boosted V8s.

 

Still seems kind of high, to spend that kind of money I would need to see proof of before and after on these motors

 

Agreed, it does. It would be nice to see some actual before and after dyno with the heads.

I believe Weistec offered the CNC heads. Might want to check with them to see how much gains they are seeing.

 

You would be correct in saying that, but it is odd to not do a matched cam/spring combo at the same time. (Unless the OEM cams are that good)

It would be helpful for you guys to see a before/after boost log also. If these heads do flow significantly better than OEM, you should see it on boost side also.

Just my 2 pennies, good discussion, surprised this hasn't been done before.

 

Here is weistec heads

http://weistec.com/cnc-ported-heads.html

No power numbers or flow numbers

Obviously they are very expensive I have seen ported and polished heads for approx. 1500-2000$ as the price should be.

 

60whp gain huh? Can you post the dyno? Any independent data to verify that? I have yet to see a 10 second slip or 130 trap from you. Should be a cake walk with all your mods. If you guarantee a 60whp gain I may be interested. In other words I bolt it on and dyno again and have 60 or more whp than prior. If not you refund the money and dyno fees plus labor involved swapping heads twice.

And Hulk I'm sure these heads cost more than twice the number you said. "Big valve" heads. I don't see that mentioned in the OP. All I read about valves was "He found that some of our factory valves can be cast out of round; so each valve is tested, replaced and re-ground to the highest flow specs." which leads me to believe they are stock valves

 

Fckin with these heads could be a disaster ,it's like black magic if you get it right,if somebody had the flow worked out the big companies would be selling it ,that's the red flag for me on this.

Too much time ,money to possibly go backwards

 

95one -

As you can see, the fact that as a whole, with a few good apples, most speak of very generalized absolutes, we are very far from having exact details posted. Using words like "race heads" is a give away.

 

True, I forgot to mention stiffer springs. Always good to have, to prevent risk of valve float. But, not really needed with stock cams or mild cams.

 

I have been on the internets - as I'm sure many of you - since internet car (or whatever) forums were all e-mail based.

I have tried to refine my "facts" to as much proof as I can provide and let everyone decide how "factual" I am being. I ask the same of others. Not everyone can for many reasons. Some can't because they didn't receive or keep any data, but certainly felt a difference, and others can't because they changed too many things at one time and can't pinpoint any one great horsepower improvement modification over another. Some can't because they are just trolls. I like to think many - or at least most on this forum are from the first two reasons.

None the less, I am always on the search for more knowledge and experience. I can only ask for proof or data, and if it can't be supplied, I move on with as little emotion or energy as I can to maintain my momentum. This is no different. I have pushed for a bit of proof and wait patiently for some. If I don't ever see any, I am no less wiser. I am happy the OP is enjoying their mods. I hope to do the same someday.

 

They offered my buddy CNC ported heads. I do know this. If you digitize the head like weistec did and have the right software to calculate air flow you can design the optimum port design on the computer then prove it on a flow bench. You're golden. Plus the consistency of the CNC you can duplicate those results for everyone.

Hand porting is great too. but, it's much harder to replicate 100% like that of a CNC. if you use a flow bench and experienced hand porter you can go far.

Also, If you do what e55amgrocket did, and optimize your airflow with the stock cam specs or whatever cams you use. Then you can get the most out of your head.

The head is where your engine makes the power. It's all about how fast you can get air in and out of the heads.

 

I understand all that was trying to makea point that weistec doesn't offer any before and after number(cfm) nor offers any before and after dyno.
Without that, it's hard to want to spend anywhere close to that amount of money.

 

Wow 5k and no mention of numbers ???,plus cores

 

I have these heads on my car. While I do have some numbers, they aren't exactly an apples to apples comparison. While I was having the engine swapped back in 2012, I was offered a deal on Hadi's lightly-used heads (his car was totaled when someone pulled out right in front of him). Since Ted (the Man!) at M Power was already swapping my engine, he offered me a killer deal on the heads install. It was an opportunity I couldn't pass up.

My "before" numbers were with MBH headers, looped fuel rail and injectors, 175mm crank pulley, PLM heat exchanger, and stock throttle body. On OE Tuning's tune and dyno (Dyno Dynamics), it made 420whp. It was typical SoCal morning weather, around 75-80 degrees.

My "after" numbers were after the engine swap. Shortly after the "before" run, I added an 82mm throttle body and the original smaller clutched pulley. The only thing "new" to me aside from the swapped block was the addition to the ported heads. On the Eurocharged tune and dyno (also a Dyno Dynamics), it made 527whp. This was in the Texas summer and it was 94 degrees inside the shop. This was still on my stock intercooler pump, which I ended up having to change shortly after this. Also, this was before the belt wrap kit.

Jerry went with me on my first drive with the heads installed. I was completely blown away. Before, I always considered my car to be a low-end beast. It had the raised rev limiter, but I never really wound it out because power just tapered off after ~5k rpm. With the new heads, it felt like it was going to rip right through the 6700 rpm redline. Since these cars have such massive low-end torque, losing a little down low was well worth what I got on the top end. As a nice added bonus, I also got a nice bump in highway fuel economy like I did with the headers.

Now I know this post isn't scientific enough to satisfy everybody; not much I can do about that. What I can do is answer this question: Would I buy them again? Yes. Absolutely. For shizzle. I managed to get lucky and pick up a used set and that made these heads the best money I have spent on the car. at original price, look at them like the MBH headers... expensive, but so damn nice and probably worth it if you have the means.

 

Maybe Hadi knows,

 

Last year I installed UPD big valve heads. I also have PTE cams, 90mm TB & 3.5" cold air intake. At that time I had a 168 Kleemann pulley & 84mm SC pulley so about a 178 combo. I also had Kleemann shorty headers & secondary converters. I lost 1 lb of boost & gained 35-40hp & 30 lb of torque. I would bet with long tube headers not restricting my exhaust flow my gains would have been greater. I will know soon enough as I just installed Long tubes & and a larger ASP pulley to bring my boost back up.

 

Guys, I am in the progress building some race heads, I will post results in 3 weeks before and after CFM flow. Heads will be ported,bigger valves, stiffer springs etc and very very aggressive custom cams

All work is done at Solo Motorsports.

 

If you are adding aggressive cams too then that will add hp for sure. What most here are asking is ported heads only gains

 

Since my heads are currently out as part of a rebuild we took the opportunity to hand grind to improve flow. Didn't go the full monty with CNC porting but didn't break the bank either. A happy medium. Here you can see where the short term radius has been hand ground:

 

I have the ported heads. I wish I got a before and after dyno.....but doing that is such a pain in the *** as the closest dyno is 45 mins away. However, I do know they make power. After I swapping out my OEM headers back in 2006 for the Kleeman headers, I could feel the car was stronger, noticeable stronger. Same with the ported heads. I could feel the car was noticeable stronger in mid and higher RPMs. How much more, I do not know. Would I do it again, yes! Would it be my first mod, no. The ported heads is a mod when you have done all other bolt ons. However, I can assure you there is power from them.

 

Let me know how those aggressive cams go. Been down that path. PTE cams are about as aggressive as it gets. I had a set made but they ground down pat the induction hardening so I wasn't willing to risk it. Finding cam blanks are impossible and our heads don't allow much room in there for much higher lift either.

 

As e55amgrocket noted, going aggressive on cams will result in failure. If done correctly, you can pick up around 30-40rwhp on heads. Emphasizing correctly!!