low_bowtie83

I have a 2005 C6 Z51 3:42 gears 6 speed manual the Ls2 **** the bed and I bought a TSP 418 CP carrillo -3cc flat tops Frankenstein M311 head 68cc should be around 11.7 to1 and a Fast 102 street driven sometimes and road raced often. These are my three options

Cam 1
234/246, .600"/.600", 112.5 LSA, 109.5 ICL

Cam 2
238/250 .620"/.612" 113 LSA 110 ICL 18 degrees overlap

Cam 3
238/250 .620"/.612" 112 LSA 110 ICL 20 degrees overlap

G Atsma

I'm thinking #1.
With the least overlap, it will give you the best flexibility for road racing, yet still deliver the goods.
JMHO

99 Black Bird T/A

iTrader: (4)

I'd definitely ask FED since you have Frankenstein M311 heads. I'm sure FED can make an excellent suggestion for your application.

I would also favor cam1 out of the three listed since it has 15 degrees of overlap since the car will see some street time.

low_bowtie83

So cam 1 is a TSP ls7 cam cams 2 and 3 were spec'd by Cam motion. FED sugested I call Cam motion and this is what they suggested with the bigger cube engine. My current cam the I was running in the LS2 had 16.5 degrees

68Formula

I would have thought the compression would work out to higher with those chambers and pistons. I'd also give the nod to cam 1 with the earliest IVC (46.5 vs 49) and 15 degrees overlap. And be sure to check those PTV clearances, especially if you use one of the other two.

low_bowtie83

I stated the wrong cc for my heads lol I had my 823s in mind they are 72cc should put me at 11.68 or so. you think I will have PTV issues?

00pooterSS

iTrader: (40)

#2

Road race car...... will likely never be asked to make power below 3500-4000 ish, don't need early IVC or to be low end focused.

Besides it's a 11.7:1 418 Cube motor in a corvette. Low end isn't going to be a concern, it's going to absolutely **** out torque everywhere no matter what cam you go with and corvettes are light I'd concentrate on average power from around 4000-7000

(sorry if that comes of harsh, don't know else how to word it lol)


I'd ask @DarthV8r his opinion

low_bowtie83

Not harsh at all lol. Makes sense to shoot for higher rpm power band 💪 power to weight should be pretty good

68Formula

True, I was on the fence. Big cubes should be able to take more overlap and combined with the light weight likely decent enough driveability. Any of the those cams should pull all the way to 7k and still be producing power. However the slightly higher duration ones with more lift would take advantage of the headflow for more top end.

I'm not saying you'll definitely have problems, but the probability is much higher when you start talking about those durations and lift. So definitely verify.

00pooterSS

iTrader: (40)

Those cams are on the mild-ish side for a 418, I would imagine any of those cams should be able to work over a very broad range and be decently lower rpm friendly, the cubes and compression will help with that too. Also the light weight.

Keep in mind most run close to a 230 duration intake duration on 346's, a 418 is quite a bit larger.


To be honest though, those cams are splitting hairs in my opinion, shouldn't be much of a noticeable difference between the 3, and it's always best to be a little on the small side than the big side with cams too, so I don't think you could go wrong with any of them for the intended usage.


As for valve clearance, I really don't know, always check your specific setup. Even if someone guarantees it'll be fine, I would recommend verifying.

99 Black Bird T/A

iTrader: (4)

With that in mind I revise my opinion to cam#2