^^^+1
It will sound hellacious and all but based on most of the reviews and lessons learned about the L92 heads, I think that cam is not "OPTIMUM" for the L92's.

 

That cam isn't gonna do what you need for L92/Ls3 heads at all they favor more numbers to exhaust side due to poor flow. Ls6 Intake won't net you what you need so you'll need to pick up some more goodies to make it happen. My motor wasn't a budget build, but i went cheaper on the heads with a factory casting an a stock intake because the fast wasn't out an i knew nothing about single plane at the time until i starting reading an matching my numbers. Can't really go wrong eithe way plenty small combo's to make good numbers with i'm in the same boat you are trying to net 550 to 600 on motor then i'm fogging the single plane. My car made pretty good numbers an it runs well. This turbo car made over 570 with a 67mm Turbo kit an denyed the 3 honks due to my exhaust... lol I was making pizza's during my shifts to yet still you see how it rolls out on 275/40/17 nitto's...

http://www.youtube.com/watch?v=LARsdGrQLxU

My short block is from LateModelEngines from texas they are the sponsor screen to your right. Brian built my LQ9 408 short Block for $4349 discounted price when GM Hightech did i right up on every GM company out there who build motors. I then called texas speed for the rest of everything. Stock L76 intake, 92mm Ported TB, 660 Lift Monster Cam, Ls3 Heads Milled 68cc, 1-7/8's LT's, True Duals, Built M6, 4:10's. Get this with a slippin clutch hungup with engagement problems an a guy who tunes mustangs who had software problems an never tuned a LS-Car i made 527/475 with quite a bit more left in it. **** the fast i'm going single plane Vic Jr. & 4150 TB set-up 3500 to 7500 RPM for the camshaft to breath. It's starving for air above 4200.

http://www.youtube.com/watch?v=l-TKY...eature=related

This is catfish's camaro on here. His 402 set-up with a Torquer V2 an it runs it's *** off with Hand ported Ls6 heads... Match your components an you'll make numbers.

 

o i guess i should stay away from the l92 heads. so i will probably go with either some trickflows, prcs or some worked 243s

 

For the money, L92's are the way to go, IN MY OPINION...They offer great results out of the box as long as your engine combo will support them. They are known to be a little "tricky" to cam. I would suggest getting a hold of Patrick G or one of the many sponsors and have them spec you a custom cam that coincides with your particular engine combination.

LSWNDR hit the nail on the head. ALWAYS MATCH YOUR COMBINATION WITH THE RIGHT PARTS. The proper way is by purchasing the heads first and selecting a cam that will "work" with them.

 

any ideas for a nice big cam trying to get some ideas. also im probably going to keep the ls6 intake till i get money and probably get some ported ls6 heads

 

https://ls1tech.com/forums/generatio...s-learned.html

 

Save your penny's son an buy the LS3 Heads through texas-speed they are 800 assembled an they flow 358/232@650"

If your looking for the perfect camshaft message Pat G for a grind to fit your application. It will take out all of the guess work for you intead of guessing numbers an limiting yourself or over camming the motor. Thats my issue right now, with fuel injection an big valves it's pointless to go huge it's not the 60's anymore... lol Back then they needed the lift an duration this is the new age things have come along way. So match your camshaft an heads an you'll be suprised what it will do on the dyno an the street!

 

Does anyone have experience on which camshafts/valvetrain work best with the non-CNC ported L92 heads for a 408 mainly for street/daily driver use to get the best combination of low and midrange torque and good high end power?

 

TFS 235 on top and your done. Your looking at about $760 difference. Decent L92 heads are $1875 and unless you already own L92 rockers your looking at buying them as well.. so for about $760 more your into a proven combination.

 

To the OP:

If you wanna build a strong 408 this is a must read as it is most 408s here on LS1tech.

https://ls1tech.com/forums/dynamomet...s-part-ii.html

During my research, I found that Trickflow 235s, ETP 245s, and AFR 225s seeemed to standout very well. I wouldn't waste my money on a cheap set of heads, been there done that. my .02.


For the 550 range at the wheels, you need a nice 408 complimented with good heads, spec'd cam, and at least a 90/90 setting on top of it all. 550 RWHP can be achieved but don't let anyone tell you it is dirt cheap and easy as hell. And I hope you have supporting mods such as drivetrain components...lol.

 

They may be fine and dandy for all you guys with a pocket book, but if you read the first page on this thread you'll see what he is trying to acieve here. Stock Casting CNC Ported Heads aren't junk in any way if that's so then why is Richard at WCCH's making badass **** with proven flow numbers, selling his cylinder heads out the ***, an he just got the march article of GM High Tech Performance on the flat black vette. Paying for a name to say you have them isn't worth it for those looking to make good power with a budget build when you could spend the extra money on whatever else you need. I can tell you this, when i last talked to richard about the mid an max lift flow numbers it was nuts... Not to mention the new CNC Program he just got set-up for this year.

 

Without a single plane intake on a cube like this matching components it's damn near impossible to make anywhere past 556/523

 

ive decided to go with the ls6 heads so i can reuse my rockers and ls6 intake. id like a cam with good amount of overlap and a decent size. i have to drive the car on the streets every once in a while. any ideas? id like to keep compression around 11 to 1 so i can run 93 octane.

 

that cam will not work....trust me as i had a similar cam...a tad bigger but not much at all... plus the fact the intake will stop making power right 6250... no need for a huge cam if you cant push the air out ... i have a 408...everything done from lme ...top to bottom.. bad cam choice... up top its fine... 2200 to 3400 ...got a bad spot...two tunners...no change... patrick g says cam has way to much overlap for those heads..... i have new cam now but not installed yet so we will see.... stay with the smaller headers as well... made more power up top with 7/8 but it lost a ton of fun down low...felt like it was a 100 hp difference down low after header change...

 

what should i spin this motor up to? i was thinking 7 grand but im not sure if thats safe and what i need to spin it that high