I don't want to push you over the edge, but here is an article on the 403 that I just finished with the new Dart heads and the Cam Motion LLR Solid Street Roller :
http://www.enginelabs.com/engine-tec...ild-with-ffre/

 

I wonder why Dart doesn't clean up the ports? Flashing everywhere in there. Obviously, good for what they are. I am kicking lots of ideas around right now and that is certainly one option.

What do you guys think of the LS7 265cc 4.065" head by Mast? The tech there said they were killer heads.

 

The Dart Heads are designed to deliver big HP at low $$$. I think they do an excellent job. The casting surface in the heads are really quite exceptional. And, in my opinion, does not hurt the flow much. If they had a full CNC program the cost would be higher.

The Mast heads are all very beautiful to look at. I have seen them at PRI and LSFest. I have never used them personally, but the LS7 platform is very attractive if you are starting from scratch.

 

Do you have any up close shots of the intake/exhaust ports?

This setup has to go through 2 tests before any changes can be made.
1. Initial track test. 2. another intake.

 

I did not take many photos of the intake port. Here is one that I found on my phone:



I had Paul flow these next to a stock LS3 head at PKRE. They outflowed a stock LS3 head back to back on the same bench about 15-20 CFM up to .550" where the factory LS3 head started to get noisy at which point the Dart Pro1 LS3 head pulled away by about 40 CFM or so to .700" and beyond. Paul Klyczek said the port looked really good to him and the only thing he might do is a custom 50ish degree valve job for what I was trying to do. But, I left them stock.

 

wildly contested subject matter, but what do you guys think about springs/pressure as a source of eating up power. I'm at 230/610, I wonder if I could lower the spring pressure. These are not your standard size LS springs, these heads have the 1.55" springs.

 

That is something I would ask Kip about based on the lobe. I am running PAC 1208X springs on this build. They are good to .750", but the spring rate is only 463.

 

Very possible. Those springs are stout as hell.

KW

 

It would be an interesting test if you did lower the spring rate and see what happens.

 

With LLSR you don't need that kind of spring pressure. Hell the BTR Platinums are recommended and its 155/400.

 

guy at CM states pressures should be 170-190 and 470-525. LMAO, I had 180/480 on my hydraulic setup. Kip, can you confirm these numbers before I change the spring tension.

 

Most people over spring... So yes 170/470 is enough. I do have customers that will run 200/600 they are conformable with that and it works. It is OK the run that high but i like just enough to control the valve train.

 

I have a feeling this will be the shortest lived heads I have used in years.
Wonder what those Darts would do with a CNC.

 

I don't understand how it's just the heads. There's so many cars that run extremely well with them. Arguably the best cathedral head out there, save for extremely custom ****. You'll have to change the intake, rockers, and cam. Lot more than just a head swap.

 

where are these cars?

thats what I thought about the head, the best. still looking for an example of a car that has my heads though. crossbreed has exhaust and intake work on his.

 

Not sure where your info came from??
My heads are out of the box except for whatever was needed for a intake port match and they have TEA's nitrous exhaust port.
Oh and they were milled which should kill numbers , not help
Maybe you should ask me about my heads instead of asking others

Sorry but im going to sit this one out from here on out , and see how it all plays out.
I feel like all I did was try to show you the heads can be made to work and now im the bad guy.
Good luck

 

Well I'm not going to try digging through thousands of posts. And it's kind of hard to follow exactly what's going on with your build anyways. Thought you said this combo felt stronger but you haven't even made a clean pass because you broke? Why not make a few passes with it before you write them off and throw all that money at them?

And if you're still not happy why not have them worked over?

Also what power did your car make before?

 

Thanks. There are no bad guys. Just data hunting.

I was only trying to point out that our heads are not the same. If I mod the intake port or exhaust at this point surely TFS will claim it was done wrong.

 

I believe Mr Brian Tooley ran the exact heads on his own vette at one time, as well as some of his customers.

 

We have chatted over this issue but would be interested in seeing data from those cars.