Katech Street Attack Z06 SN# 97
 

This car is owned by magazine writer/online blogger Hib Halverson, who is a regular on these forums.

Street Attack Z06 engine build
-Katech/Mahle Forged pistons
-Regushed LS7 rods
-Katech Torquer 116 camshaft
-Bronze valve guides
-Katech Ti/Mo intake valves/OEM exhaust valves
-MSD intake manifold
-Nick Williams 102mm throttle body
Katech valve covers powdercoated satin black
Katech coil relocation kit
Katech LS9X clutch kit
Katech remote clutch bleeder
Katech carbon fiber splitter/undertray/brake ducts
Katech front fascia reinforcement
Katech carbon fiber spoiler



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Wow, beautifully built car. Hey Hib, can you write up a review of the car and post it up here on the forum? I'm sure Jason wouldn't mind.:thumbs:

:thumbs:

How did you adress the heads, did you use bronze guides.....or pm or other material......moldstar guide looks like it holds up..

He typed 'bronze' in the post :yesnod:

Nice build....simple and puts down some good power. :cheers::cheers:

1 of 12 Z06s in that color, nice! Can't be more than a handful of Z07s in that color as well.

Nice build. Just bough the 116 cam from Jason for my build, have the same pistons and bottom end and heads done the same with dual springs. No MSD though, dyno tomorrow with Patrick at Quality Motorsports, would be nice to get close to this much power out of mine?

Same clutch in mine too. I approve :smash:

Steve

Thanks I missed that......duh

Nice!

Beautiful Z06 and quality build.

wow

Katech heads for our cars are going to be OE head castings machined and assembled by WCCH to Katech specifications. I believe Katech uses the same CHE manganese-bronze guides that WCCH uses, but Katech specs their Ti/Mo intake valves (not re-used OE), and either OE exhaust valves or Ti/Mo exhaust valves depending on the vehicle owner's wants/needs.

Jason, please correct me if I've misstated anything above. :cheers:


Also, since most of Katech's C6Z builds utilize Fast intake manifolds, OE TB's, and Halltech CAI's...were you averse to utilizing Hib's MSD/NW/Mamba setup that was preexisting on the car?

Thanks I appreciate it..for all the input I am using Che guides in this heads and cam build

Jason, is this with OEM exhaust manifolds and cats? I believe Hib has been committed to the factory exhaust to comply with California emissions requirements. That Mamba CAI looks badazz!

Yes, it has factory manifolds and cats.

updated with video

Nice ride!

I just discovered this thread sort of by accident. I'd like to answer a few questions about "Katech ZO6 SN 097" aka the "Blue Bullet".

In model year 2012, GM built a dozen Carlisle Blue Z06s. Of that dozen, three were built with:
1LZ, base equipment package
ZO7, ultimate performance package
B92, carbon fiber hood

Only one car was built with those two options along with:
PBC, engine build experience
VEB, aluminum pedal covers

That car is the Blue Bullet.

The valve guides in my Street Attack engine are manganese-bronze parts manufactured by CHE. My opinion and that of WCCH, Katech and others is that, as long as guide/seat concentricity is held to .001 or less, Moldstar 90 guides are an unnecessary expense. On the other hand, if the lack of concentricity is greater than that, then maybe guides made of different material would offer better control of wear rates. In my opinion, it's better to have guides and seats which are concentric rather than use guides of a more expensive material.

There's an interesting story about those heads. The set I put on that engine during the Engine Build Experience at the old PBC in Wixom, MI, were eventually replaced under warranty because of a problem with lack of concentricity of the guides and seats. After the warranty work, that set of heads were returned to GM. At the time, I was in the middle of writing a series of articles for Corvette Magazine along with another Corvette web site which covered the development of the LS7 engine as well as the guide wear problem. In the process of writing those articles, I was able to convince GM to share the testing and fault diagnosis information it gained about the car's original set of heads using one of the CMMs in the Inspection Department at GM's Global Propulsion Systems HQ in Pontiac MI. After GM was done with that, it was kind enough to send me back the disassembled heads. I appreciated the gesture because LS7 heads are serilized and their numbers are on the "build sheet" that went with the engine which I assembled at the Performance Build Center in 2012.

To speed up the process at Katech, rather than having them ship the heads on the engine–the set of warranty replacement parts–to West Coast Cylinder Heads for them modify to Katech Street Attack specs, then have WCCH ship them back to Michigan for Katech to install; I took the original bare heads to WCCH myself. They CNC-ported them and installed CHE guides then shipped the heads to Katech where they were fitted with Ti-Mo intakes, stock exhausts from my supply of valves and PSI springs. That saved about two weeks of shipping time.

Bottom line, my Katech Street Attack now has the set of heads which I originally put on the engine at the Performance Build Center back in 2012.

In lieu of Jason commenting, I'll attempt to speak to that. While some of the pre-existing bolt ons which I had installed–MSD Atomic Air Force manifold, MSD coils and the Zip Products Mamba air intake assembly–were not typical of Street Attack set-ups, I never had a sense that Katech was "adverse" to my request that those pieces be retained. I should add that there is plenty of evidence that the MSD intake is a better performer than the stock LS7 manifold and, in some applications, has proven a better choice than the FAST. As for the Mamba, a couple of years ago, Jason told me that, of the "CAI's" they had tested, only the Halltech and the Mamba posted any significant gains. Lastly, the Nick Williams TB on my engine was suggested by Jason.

Katech's engine dyno numbers for my Street Attack were recorded with "dyno headers" installed, however, to pass the California "Smog Check", I must keep the stock LS7/LS9 exhaust manifolds and catalytic converters. As a result, the actual flywheel power and torque from my engine is a bit less than what Katech saw its engine dyno, but serve to compare my engine to other Street Attack LS7s. The chassis dyno numbers, obtained using a DynoJet, came with the stock exhaust on the car. I do my own testing on a SuperFlow AutoDyn at Westech Performance out here in California. DynoJets and SuperFlows tend to differ a bit with Superflows producing a bit smaller numbers. Eventually, I'll run the car on Westech's Superflow and it will be interesting to compare results.

To date, I've kept the exhaust system aft of the converters stock. Eventually, I'm going to have CF member "Josh B" modify my production '12/'13 mufflers for increased flow.

So that intake fits a Z07 car. Nice to know.