you mean the unported 18x's?

the flow from low to high is pretty damn awesome on the ported 18'xs.........could probably be even higher from some good porters.

 

If your going to go the whole route of new pistons etc id get the Brodix Canted Valve heads.
http://www.weldtech.com/products/BrodixCantedValve.html

Greg Goode said he ports these heads from a bare casting to about 450cfm @ 700.

 

Brodix just had a blow out sale. I paid $800 for my heads cut to MY specs with seats and Guides. The pistons I already had for my 383 Build up are Coated Wiseco's for 18-23* heads and for 6in rods. They will be for sale soon as I want to go to a flat top and bump CR.

I wanted Virgin unported heads so we could keep port volume down and velocity up while taking advantage of the 18* angle I also WANTED shaft rockers not the common 23* stuff I keep wearing out. every thing else has to be purchased as needed and measured any way. I am also looking at going with bigger lifters and little things like that.

The intake while intimidating has smaller ports to add to this effect

I am just tired of fighting for my seat at the table with the LS1 boys. So I kind of joined them so to speak

I still Plan on driving it on the street...just not as much

Schurters LT1: Not sure why it says my mail is full? both of my accounts are up and open.

let me know

 

*drool*

 

Ken, I assume you noticed that the Brodix Canted Valve, GB2000, and other similar heads have port volumes in excess of 300cc's. Though its true that these ports are also longer then the typical 23/18" head has, these heads are plain enormous, and really woudln't be suited to anything but a High Compression Big inch motor, or possibly a very serious Forced Air motor (ie not street car stuff).

 

Yep, I was aware

 

LT1 and SBC headers have the same bolt patterns, you can do Spread Port SBC stuff, which means that the center exhausts are spaced apart from one another. That means different headers.

With the 18X you have the 18deg bolt pattern most likely on both heads (STD and SP) so a different mounting flange is needed. If you are going to run 18X heads then get a custom headers with bigger tubes made for that thing by someone like Kooks.

Seriously these heads well ported are going to be in the 360cfm range @ .700, they will absoultely kill a AFR 220 or even a 227 ported by the same person.

As you can see the .300+ numbers are the area where you see big gains. 10-15cfm is a big gain, and 60cfm is huge! Your gonna need a high lift cam to take adavantage of that kind of flow and that's going to hurt valve spring life.

Again good race heads, bad street heads.

Bret

 

I know of a Set of 18* Brodix heads from someone who posted in this thread with over 370 cfm. Port volume was much smaller then a set of lower flowing AFR 220s the same Porter did a year ago. The bench at this shop is Extreamly conservative. Usually about 3-4% under what most others claim when other heads are tested

I am actually only looking for 330 or so at .600-.650 lift. I just want to make the ports taller as far as porting goes. We will see what they like.

With the price reduction from NASCAR going to SB2.2 stuff it makes them affordable

If I get pics this week I will share.

 

I would like to know how much This set up is very very nice BUT what kind of money are we talking here . We don't need it down to the last cent because there is too many diff set up to go with but
-Head work $$$$
-Headers $$$
-intake mod $$$
and so on , this would be a killer set up if it could be done under 5-6K



OneFlyn95z28 i tryed sending PM mail box full every time i email you on 58 mmtb, send me mail so i can talk about it and your set up
thx Jeremy

 

First you have to get the head cores, vavles and the rest of the parts for the heads. Lets say $1-2K for the castings and $400 for the valves and small parts.

Then find a good porter to do the work for you. $1000-$2500 seems like a good range for quality head work and valve job starting from scratch on a head like this. That should also include milling for the right size chambers.

Headers. You can do this right or do this wrong. The right way is to call up Kooks and go from there. $1000-$2000 for headers made on your car for your application. You could back yard it and have the wrong setup and be worse off in the header department too.

Intake....... What do you want to start with? What do you want to end up with? EFI?? LT4? Single Plane etc....

This is hardest thing to judge. A single plane is cheap but then you are going to a carb. EFI is going to tack on more money and a ECU to handle it, unless you want to use the stock one and limit it to 7000rpm. A custom intake like a Wilson or Hogans is going to cost some coin. Even a modified LT4 intake is going to be work because the intake is not going to bolt up to SBC heads unless you convert them to bolt up to it.

So at the low end there is the carb/single plane and spacer combo. Were talking 18 deg stuff here so it costs more so $900 for a bare bones setup with a decent carb to start with. Better carbs and ported intakes add to that. All the way up to a $2500-$3000 sheetmetal intake.

So for the most bare bones, carb setup here you would be around $4,500, but probably closer to $5-6 all the way up to $10K.

So it depends you want to do it or do it right?

Bret

 

Bret covered it well.

I did the math and it was cheaper then converting to a LS1 and buy a heads and cam kit. Hell it was cheaper then the heads and cam kit alone LOL.


Schurters i see the problem. I do not use the PM system. PITA to check at every board I use or moderate at.

I only use my E-Mail accounts There is a current one listed here

 

Thx Bret, that is whay i need to know oups i just droped a $100,000,00 bill

OneFlyn95z28 you have mail

 

Damn guys that was informative. Many thanks. I actually learned something this time around.

Thanks,
-JOhn

 

As stated above, unless you go to spread port stuff the headers don't have to be changed....

I think you guys should look at the Track 1s myself.... The CNC ones are 215cc ports and flow a hair uner 300cfm above .500 lift with much better low lift flow than AFR 210s for example. They list at $2500 but I got mine for $1800.... Just gotta find the right hook ups! .



The T1s use a Felpro 1206 intake gasket so it probably would match up to a LT4 intake pretty well - or at least has enough material to be made to match up fairly well.

I think this is a cheaper option than some here have said. The T1s are 23* heads and thus use all the same stuff a regular SBC or LT1 head uses so there is no additional piston costs or the like.... Exhaust is a non-issue...

Obviously you can take the 18* plunge and really get some serious flow but I don't know if the costs really make sense at that point.... Maybe, but it would be a very tough call between that and/or power adders or an LS1 swap.....

 

I would just like to point out he main reason i went with the 18* stuff was to keep up with the LS1 guys

I know it is a cheap excuse but they have 15* heads from the factory and no matter how big you make the port on a 23* head it is hard to catch up to stock cast LS heads right now.

I have a friend who did head/cam and headers on a 99 SS. With a canned tune he gained 128rwhp!! I have got mine up to a 144RWHP gain but I started at 256 and he started at 301!

I just can't take it so I stepped up. No it is not a step for everyone...As a matter of fact I do not think anyone else should do it

later guys