Nice thread...................one of many.

I have a LOT of flow bench data from a LOT of 4g63 cylinder heads. The problem is all of them are the older 1g DSM heads. Yes, I have flow bench data from our heads, no I have never posted them and it's because it is useless. A flow bench is like a dyno and the flow bench we use JKN is also like our Mustang Dyno and reads considerably lower than the industry standard Superflow benches. So our numbers are worthless if you aren't going to compare what you have on this same bench.

I can tell you that our EVO8 has held the MPH record since 2007 and it had our head on it, if that really would make a difference to anyone. It's the same Stage 3 head we sell and use on every customer car. Same one that is on my 9.0 at 159.6 mph street car that weighs 2985 pounds and ran that with an HTA86-35r on it.

I have no had a chance to flow test any other companies head. Believe it or not we rarely see a head from anyone else. Last year we ported 58 cylinder heads and shipped them, that was in 2007 only. That's more than 1 ported head per week. I don't know how that compares to anyone else but it's all we can do to keep up on the demand, we can't do the heads faster than we do now and right now it's a 4-5 week wait to get one, unfortunately.

I have no desire to argue, I made a few references to fast cars just because it's been done 50 times in this thread.

Look around, shop around, decide who you are comfortable with. Think about the 58 guys last year that got a head from us and think about if you've read a negative comment about any of them, I know of none.

Having a who's head is best arguement is worthless.

Our Stage 3 head is $1625. It is hot tanked, pockets are cut, the head is FULLY ported, the combustion chambers are also ported, smoothed and matched in size, it is then cleaned again, the head is o-ringed with a SS oring, new SS coated valves are installed, dual valve springs, titanium retainers and new valve seals.

Good luck with your choice.

 

Call each of the shops who make the head you're thinking about buying. Ask them about targeted performance ranges for their heads. Ask them about flow data and the conditions under which their heads were flowed. Ask them how many of their heads have had failures because they're ported too close to the water jacket, as Ted B.'s quote alluded to. Ask them what their warranties are if that happens to you when the head cracks where it was ported. Ask them for recommendations from well known people who have used their heads. Compare prices and check your pocketbook. Then make your decision.

 

I had the stock head with a regular 35r and hks 272 cams.

I then switched to the buschur stage 3 head with his BF272 cams and gained 92 hp on pump gas. Pretty impressive gains I think!!!

 

LOL. I will stay out of this one.

Chris

 

No disrespect but i think you should look into the difference in castings. Internally cut some apart and you will see the differences from 03 to 05.

Chris

 

Awesome man, if it shows that you would have obliterated the previous 171 then its obvious you will duplicate that same mph later on. I am in the market for having a built head done. I like headgames because of the work they did on a head for my k20 motor, but I like to weigh options as well. I see good coming from bushcur, AMS, headgames, JAM...etc etc goes on and on and on. You are definately earning the upmost respect with your posts towards me. I know my posts sound kind of dick headed but the internet doesnt portray my sense of humor at all.

 

buschur > ams ....for me any day...just my opinion from all my knowledge of reading and I read a A LOT! : )

 

Thanks for the correction on which head you guys were running, given that you had Headgames stickers on the car, gave Headgames thanks in your youtube vid and I was told directly by AMS employees that you were running a Headgames head back then kind of gave me that impression maybe you were running a stock head and that's your secret sauce

As I have stated before, all three companies make a great quality product,

The one area that is the MOST important and something that is critical in determining what makes a head port 'best' is the intended application that it will be used in... Saying your head is BEST may be true for a 45+ PSI car, but that head I assure you will make a car feel lazy and like DOG CRAP on a 400-600whp car! A huge port with +1mm valves is not going to be the perfect setup and perform best for every application.

 

http://users.erols.com/srweiss/tablehdc.htm#MITSUBISHI

This is good reading too

 

Actually Erik, oversized ports will suck with an FI engine just as they do with a NA engine. My comment was this doesn't seem to be an issue with an EVO head, because there isn't enough meat in an EVO head to enlarge the ports sufficiently to create a velocity issue. You will hit water before the port becomes too large. Been there, done that!


It can't be, simply because that isn't what's happening. The engine has to draw in air with a turbo setup, just as it does normally aspirated. All the turbo does is increase the density of the air in the manifold.

 

No disrespect taken. It doesn't matter to me (or anyone else relying on the shop) whether there are differences in castings. Whether the porter is porting your head from an 03 or from an 05, they should know what the safe porting margins are, and make sure that they do no more porting than the head will safely take when its run hard. You pay the shop big money for THEM doing their homework and knowing when enough is too much. You shouldn't have to cut heads apart -- that's their job to know the limits.

A "great" port job isn't very helpful if it's so thin that it cracks through anytime during its intended lifetime, is it?

That's why the question about whether a shop will stand behind its porting is an important one.

 

you want excellent head
get cosworth...

 

I'm sorry, but there is nothing about the Cosworth head that is especially impressive. You pay for the name. My head flows so much better than Cosworth's head that it isn't worth comparing. And I know this because we tested them.

 

Cracking of a cylinder head from porting is very-very rare thing to see. I've seen it in only a few cylinder heads and each one of them have had modified cooling systems. The cores have changed from 2003 to 2006 but I don't feel the differences in the cores effect a port cracking as much as the difference in cooling system changes. Seeing as I know who you are connected to COVR4, I am assuming I know what you are talking about, so figured I'd address it. If I'm off base, it still put more information out there than just your warning and I'm glad to do that too. Many times an entire story doesn't get told to help someone else feel better about their lack of accomplishments. That is not pointed at you BTW.

 

Well said Ted.....