Silver_Bullet_Z28

Hey guys, I'm looking at getting heads from Advanced Induction to be good with my cam and intake I already have and on AI's website for my 241 casting heads they have 205cc, 219cc, and high compression 219cc...I was looking at some high compression 219cc with 62cc chambers and cometic .040 head gaskets to put me at 11.15 compression ratio but I'm worried that it would be too much for ls6 intake and mild cam. What AI heads and head gaskets (stock thickness or thinner like the .040) would be best with my current setup below?


my setup right now on my 2000 Z28 M6 is:
224/228 .581 .588 112lsa cam
Hardened chromoly 7.400 pushrods
Single beehive comp 918 valve springs
Pacesetter 1 3/4 headers
3 inch true duals w/ mangaflow mufflers
LS6 intake
373 gears

Made 392 rwhp and 375 ft lbstq on DYNO jet

Ps. Will be getting stock throttle body ported, 42 lbs injectors, LS7 lifters and LS2 lifter trays

mchicia1

iTrader: (5)

Get the high compression 241s, they make as much power as the 226cc 243s they offer.

You are making an excellent choice going with AI.

01ssreda4

iTrader: (96)

This will be a very nice street combo with a ton of midrange torque/throttle response. The cam and intake you have are fine for now and won't hold you back. If you want to maximize every HP, you could always swap them later if you felt like it needed it.

PREDATOR-Z

you'll need to change the springs with the cnc heads. get BTR duals or PSI singles.
219 high compression all the way.

Silver_Bullet_Z28

Sweet, thanks for the responses guys. Their BTR .660 with titanium retainers look really nice but would that be too much for a .581 .588 cam?

01ssreda4

iTrader: (96)

Predator, why would he "need" to change the springs? Op what's the mileage on your current setup. And, hey from Shreveport/bossier area

mchicia1

iTrader: (5)

Because he has 918 springs, it's like playing russian roulette.

PREDATOR-Z

I have used XER Compcam lobes for many years and they are sharp. Lift variance on them is 49 and from experience their dual 921 class is better in properly handling those ramps. (However they are pricey and BTRs are top notch for $$ spent).
This is my opinion as per my experience with their products.

mac62989

iTrader: (1)

HCR 219s all the way. Im in for results, shoud be great on the street!

Silver_Bullet_Z28

I have the "revised" version of the 918 springs that hold .625 lift but I'll get some duals if needed. I'm just wondering if you can have too much of a spring for a cam with .581 .588 lift seeing how the BTR duals are almost .80 more than I got

PREDATOR-Z

No, not in this case. XER has a sharp lift variance (49) and springs are not chosen just by "lift" capabilities. Open and closed pressures are very important as well, as well as valve weight and rpm use.
Now if you paid meticulous effort to all installed valve height and everything is top notch, these 918s will work for awhile; but for street BTRs will last longer. I would run 918s on a drag setup and check them all regularly, but for street lots of things can wear out a spring really quickly.

Silver_Bullet_Z28

Ok, I'll get AI's $300 add on option for the heads for the BTR dual valve springs with titanium retainers. Thanks for the advice

Silver_Bullet_Z28

Haha do you go to fant? And I installed cam, pushrods, and springs at like 137,000 miles I think and it's got 149,000 now

01ssreda4

iTrader: (96)

Gotcha, didn't think that one through all the way. AI offers the Lunati duals as well, what's your thoughts on those (other then the very obvious steel retainers)? They would fit his application correct?

Nope, never been. We either collect at the track, the atv park, or my house. Just a few of the old school Camaro guys that been at this a while.