You either went off too soon or you spiked your dopamine to euphoric levels. lol.
Tony's 245 heads do hang on till about 6000rpm compared to his LS7's.
At any RPM below 6000rpm the 245 head is stronger especially off idle to 4000rpm it's much sharper. Then as RPM's increase and velocity builds up in the LS7 port it starts to reach it's peak and anything 7k+ the LS7 just keeps on going. Cathedrals are done around 7k with a FAST 102 which is exactly where I want to be. With an MSD it will pull about 400rpm higher but sacrifices too much torque throughout the whole range for that extra RPM and hp gain.
Don't forget the LS7 head is a high rpm race head and it's intended purpose is to rev and make power. With Tony's custom work he improves it in every way. It still makes good torque in the lower ranges but just won't be to the level I am wanting.
Remember my goal is not for max power.
Re read the thread where Tony posted and you will understand.
If I had a corvette then well, have a guess what I would use....

 

I didn't want to say it but I TOTALLY agree with you about the LS7 heads! Different bottom ends with 'per say' heads and different outcomes.....

 

Oh yeah...

 

Mine proves this, lol. Made 580 with a effed up bottom end.

 

Haha. RIP

 

99% of Tony's combos are sub 7000rpm builds with LS7 heads. So he's ripping all those guys off by not selling them on Cathedral heads?

Can you show me a cathedral headed engine that's making over 600whp below 6000 rpm? How about one that gets even close to 600whp with a 230's cam that will drive and idle very modestly?

https://ls1tech.com/forums/dynamomet...hp-580-tq.html

 

Remember I did say that from 6000rpm the ls7 starts overtaking and after that, the more RPM the larger the advantage.
Remember I'm focusing on the curve off idle to 6500rpm.
You should email Tony and ask him this.
I have seen that thread before....

 

Glenn at G&D knew what he was doing better than most other LS workshops at that time, from what I had seen.
With the susp, eibach are very good I have them in my Camaro. They handle but still retain very good ride quality.
A lot of the aussie aftermarket coil springs are sh*t from my experience. Only lovells out of all of them I have felt have a decent ride but that was in a Ford. Haven't tried them in a VY/Z.
I recently put pedders grey lowered touring springs in my VY and although it handles well it is too harsh over bumpy country roads. The factory FE2 springs were much better. I'm going to try lovells next and if they're crap i'll get eibachs. I don't want to mod my VY much i'm keeping it mostly standard, but I wanted it lower just for appearances and now I've ruined the good ride that it had.

Back to the ls7 versus cathedrals, people may need reminding that the aussie HSV sedans + driver will be 3900lbs (or more) if no weight reduction has been done. My old HSV R8 that I used to race was 3700lbs with driver but it had weight reduction done at the time. Full weight from factory they are 1710kg kerb weight, add a 80kg driver = 1790kg which is 3946 lbs !
So you can see that a race orientated LS7 head intended mostly for lightweight vettes, might not be that smart. The cathedrals have already been proven to work well in heavier cars.

 

I won't touch kings or any other aussie spring.
I have had eibach for 10 years and while it's a firm spring it's very well controlled and smooth.
It goes hand in hand with the bilstein shocks.
The suspension is expensive but worth it. Just for two front shocks it's $650.
I don't think eibach make springs anymore for the Vt-Vz chasis, however there may be a a pro line spring available which is stiffer again.
I also have aftermarket front custom sway bar 30mm at the front and a custom rear sway bar at 22mm in the rear. Plus I have full superpro bushings throughout and way stiffer and lighter engine mounts too.
Car is planted but is a little more oversteer biased for better handling.
One other thing too Launch I find that the HSV version of these cars always ride better even with the same modifications. Handling, and ride my brother had the same mods in his VZ and VY and it just did not handle or ride as well as the HSV.
One trick you may not be aware of is that the HSV version uses the same strut setup of the VZ crewman models which sits a little higher but then of course they put their own spring and shock combination in.
This may have something to do with it, I don't know.
Also, pedders are **** and overrated. I won't touch that crap.

And these cars are heavy. To get this bulk moving, I'm definitely using the right head.

 

I think the cathedral is right for you. Honestly, with the fear of a big stall,that alone says cathedral. But only for you. 99% of people building this kind of engine,the ls7 mamo heads are better because races are not started at 3000 rpm. And my car with driver is close to 3900 with me in it, ls3 factory heads ported and solid roller. Not lazy at all, I could only imagine someday swapping to a 7cc smaller mamo ls7 head and gaining 40cfm of flow. The air speed and tq would be insane.

 

Fixed for you

 

I'm pretty sure they mean the same but thanks

 

It was a joke. You know, haha funny funny? Geez.

 

I have no fear with a big stall. Anything over a 3200-3600 reduces streetability. In fact I would like to lower it back down to around 3000rpm if I can.
And again, I am not RACING!! I don't care if races are started at 3000 or 6000rpm. I'm not doing that.
I am street driving and with light and part throttle applications I bet I would beat you ls7 headed fanboys in sheer momentum until you put your foot down and slowly pass me.
And yes, going from ported LS3 heads you will get some good gains for sure with the mamo LS7 and you will make more power everywhere BUT, for my application the cathedrals will still be stronger through most of the RPM range and make more torque and will get me off the line faster.
Your definition of laziness may be different to mine too so we can't really compare.
Even Darth felt his LS7 heads were lazy and they were done by lingenfelter.
He couldn't wait to get them off.
I felt the same way about mine.
It's almost like a weight has been lifted from my shoulders.

 

Awww how cute.

 

I wish you all the torx.

 

Yes Mr Spider

 

Who shot the family dog around here? Guys so serious.

 

Yeah his uptight isn't he?

 

If some of you know,
What is the difference between the DART 220 BHN iron and the LSX 400 MPA?
Which one is superior and why?
Darth is a metallurgist and might know the answer.