Wow, great results anywhere that Tony is involved! Got any pictures of the car/motor/build?

 

Me too....LOL

Mid January or sooner.....hopefully the latter

For now PM or email me (even better) for pricing or questions regarding a potential job etc.

Yes....11/32 X .125 wall....much stouter than a typical 5/16 X .080 wall.

Regarding the rockers they are only available thru me (I am the reason the Yella Terra Ultralite program for LS engines were introduced many years ago.....its a long cool story). Anyway....i still have a great relationship with management and encouraged them to build a version with stouter, larger stands for less flex and more action at the valve. The only thing you have to do is drill and tap your current 8mm thread in the cylinder head to 10mm. I have a CNC program that handles it for customers buying heads thru me but any decent machine shop can handle the enlargement of the threads. You could tackle it at home if your pretty detail oriented and have the right drill and tap.

AFR 8019 springs that I install a bit tighter for more seat and open pressure (165 closes and 420 ish open)....you need a little more spring to have a perfectly arc'ed power curve that carries to 7K and beyond like this (plus the other parts that all help achieve that perfect valve control such as hollow stem intake valves which I failed to mention because I simply forgot....LOL

Someone asked about cost.....it certainly adds up when you optimize any build to this extent. The fully race prepped Mamofied heads with the lightweight intake valve are around 3600 (the valves are $45 each btw)....$1350 in a ported FAST....650 ish in premium lifters....$225 ish in pushrods....$475 custom cam....$350 ish injectors.....it ADDS up....but most people dont realize how much money a budget build adds up to as well.....spending another couple of grand to do things right and clearly seperate your results from the rest of the pack makes decent financial sense when you consider how much time and money you will invest to fall short.....some by quite a large margin.

Like my sig says below....save longer and do it right....it cheaper than doing it twice (when your underwhelmed with the results of your first attempt).

No regrets....big power....and you get to be an Internet hero.....LOL



Cheers,
Tony

 

Just saw this thread. Really good numbers and that torque curve is so flat, gotta love it.

 

Awesome results, get a video up of this beast!

 

what are the advantages with 10mm Pro Ultra lites vs the 8mm?

 

10 mm bolt holds rocker arm better vs higher
Spring pressure.

 

Sounds like this corvette is a set of hand finished 220s and a 1.875" header away from flirting w/500 and yet the intake lobe is 227 degrees; Crazy !!!

 

I bet that 227 cam gets in the power band so quickly. I'm still amazed!! The new head program makes me wonder how a common 408ci will do mamofield!!

 

Already been done, Tony did Steve Smiths 407 W/ AFR 215s very
First build with those heads. Engine build was featured in PHR &
Engine Masters summer 2010. curves are available by search.
Made 618 crank &540 RWHP, @6300 RPM,
564 lb ft crank about 490 LB FT RW @5000 RPM
in C5 W/ optimized drivetrain. 242* W/ .610 114 +3.
Single Patterm.
Switch to Mamo Motorsports 220s + 4* Exhaust, MSD Intake or
Comp HP runners if available add 15-20 lb ft @ 2500
Probably + 15-20 RWHP @ 6300 30-40 @ 6800 RPM!
No Pressure Tony LOL

 

Same as the guys with 23' SBC's installing 7/16 studs versus 3/8.....less deflection of the rocker arm equals more opening rate, duration, and lift at the valve (better valve action)....that equals more airflow and more power. Also more reliability from the stouter set-up.

No doubt....Im pretty confident that would be the case in Jack's car which was carefully planned and executed properly with the right combination of parts.

Its not a huge head either and with the small cam this package is very explosive....its the have your cake and eat it to scenario but the cake requires specific ingredients and it costs a little more.

Some (most) of you guys weren't on this board when I made 475 RWHP / 435 RWTQ with my stock C5 shortblock in 2004-2005. That was also a very optimized package I worked on slowly tweaking it to the final numbers I mentioned above. This was also with a similar driveline and clutch in Jacks car (exact same weight/style clutch in fact), but I had a smaller cam (224/228), a different set of headers which helped build more torque (LG Pros with a reeeaalllly long primary pipe)....typical 5/16 pushrods and stock brand new at the time AFR 205's that I just finished the design work on. If I built the same package today with my new 220's Im about to release and the rest of the items I helped Jack with in his build I'm extremely confident I would clear 500 to the ground in a package that's docile enough to enjoy every day....that folks is a serious accomplishment and is justification alone to consider it. People swore my car was a 383 cause it sounded so tame but it ripped when you were on it with such authority most assumed it was a larger displacement mill with a mild cam.

Here is an in car video run of that car at the track....low 11's at 124 in this run at a positive 1600 D/A (pay attention to how smooth the idle is prior to me bringing the revs up and dumping the clutch).

http://vid307.photobucket.com/albums...o_Run_4-15.mp4

Cool stuff...

Btw....I am probably building a 346 and heading to the engine dyno with it....likely with the same cam.....might even test a larger one in the same engine to see the difference it makes and what you give up on the bottom.

-Tony

 

^^^Talk about a sleeper lol

 

Nice.

 

Nice job.....this is a proper 346!!

 

My combo is reasonably similar in my C5. AFR 205's, 226/230 .600 114 cam, Fast 102, headers, YT etc.
A4 car and has gone 10.99 just shy of 124.
Nice crackle to the idle.

No dyno numbers. Just track tuning.

Definately not a combo for guys who wat a nasty sounding idle. Ha! But it spanks em bad.

I like the idea of the bigger bolt for the rockers. It just makes sense. Prob not a DIY mod though.

Ron

 

Makes me wonder what a set of "Mamofied" 220s would do...

 

Damn son, you've got "Mad Shifting Skillzzz" ! !


Scotty

 

Scotty.....good to hear from you

Hope all is well in your neck of the woods!

Cheers,
Tony

 

I am gonna bet a fully optimized 346 W/ MMS 220's clears
500 RWHP In a C5, 580FWHP on a Dyno W 227/231 Cam,
520 RWHP In a C5, 600RWHP on a Dyno W/ 231/235 &
FAST 102/102 W Mid Length Runners 1 7/8 LTs
11.5:1 Comp.
No Pressure, LOL!

 

All good bro, glad to see you're working your black magic making power !

Gonna have to catch up soon....black ops ya know

 

I just saw this today, awesome build. Very obviously vavetrain stability played a huge roll in making this power. What type of valves and what size? What were the valve weights? Also what springs w/ what open pressure?

Really cool build. I may be calling you soon tony! I'll need a ported MSD intake (when they come out) and valve (TI exhaust) and spring specs for LS7 heads when I rebuild them!