Been looking around, trying to find a cam for a high CR 408ci with some giggle juice?

Anybody have some input on this? Want to make really good N/A power and the occasional giggle power.

Thanks

Casey

 

What kind of idle quality or drivability are you looking for? For a nitrous engine, go with something with a traditional split duration and maybe 114 LSA. Something like 236/242, less than .600 lift, and 114 LSA.

 

For NA performance, slap an MTI S1 cam in there.

 

It will be mostly street driven. I have a C1 right now. Just need something where I drive it a lot and idles good. I have LS1 edit too.

Just really want something where I make good N/A power. I dont plan on use nitrous all that much.

Casey

 

That cam is a little small for a 408ci Tony dont you think? I would think NA would not be so great..

 

too small tony.i was thinking more like a 242/248 .610+ lift on 112lsa, but thats just me.

 

I am thinking Tony is looking at the fact this guy wants a good idle and a good nitrous cam. If this is the case that cam is fine. It should still make around 480-500rwhp..

 

it should idle fine with tuning... that 409 should swallow up the 242/248 like if was a 224 cam on a 346.

 

It will be a 6speed car. Idle can be a little rough, doesnt have to be perfect. The 242/248 sounds like a good idea.

Any more input would be awesome guys. Man I love this sight, thanks again.

Casey

 

The S1 was borderline "drivable" in my 434ci setup. That was almost 30 cubes bigger. Some of you guys always think bigger is better, but I'd rather spec a cam on the smaller side and not sacrifice drivability.

Ideal balance of performance/drivability cams, in my opinion:

346ci - something in the 224-228 intake duration range
382ci - something in the 232-236 intake duration range
400ci - something in the 236-240 intake duration range
427+ci -something in the 242-246 intake duration

I'm not a big fan of crappy idles or low rpm bucking, or stalling or hard restarts. I'll always sacrifice that 5-10 rwhp for more drivability, unless I'm building a drag-only trailer queen. Peak rwhp figures mean very little to me, I'd prefer a broader curve with a better midrange torque output for a daily-driver.

Tony

 

how about MTI's R1 cam? they use it with good results in bigger 427's... should be just right with a 408...

 

What do you consider high compression?

 

What about a 230/230 .560/.560 on a 114 for a RELIABLE(valvetrain) well mannered 10.5:1cr 409ci engine in a 5300lb truck?

I think this engine will have a set of Stage 3 MTI 6.0L heads on it also. Just have to make a phone call tomorrow.

BTW, I just posted this from my laptop computer with my new wireless router hookup.

 

The R1 cam is a damn good cam for a 382ci setup. That is the planned cam for my 35th SS if I install a 382ci. It would be a "mild" cam in a 408ci, but it would lope enough to not sound stock. When installed in a 427ci, the R1 cam sounds nearly like stock idle, depending on how loud the exhaust is.

Just remember that most of the higher intake duration cams will impact low/midrange torque. Thats the fun stuff for a daily-driver, I'd rather keep it. Bigger cams also wear out valvesprings faster.

Tony

 

Different applications for a truck. Trucks being heavy, would definitely benefit from the increased midrange torque. That 230/230 sounds like a good long-mileage cam, and should help the valvetrain live quite a long time. Plus, you should be able to tow with it

Of course, if these new intake manifolds come out and do what we hope, everyone on this site will have to rethink their cam specs. Currently we are just crutching the stock intake manifold restriction with our cams. Things could change alot soon....

 

"Peak rwhp figures mean very little to me, I'd prefer a broader curve with a better midrange torque output for a daily-driver."

Nineball you got it on the money, thats exactly what I want. So you think that 236/242 be good?

About 12:1 CR

Casey

 

Tony - That cam I mentioned above, you think I should have a few degrees of advance ground in or not. I'm thinking it'll probably be fine without any in a big motor. I'd like to keep shift points around 6000-6200rpm.

 

wouldnt the 409 already have plenty of low-end and mid -range TQ? it dont think its a high-revving engine. but i guess idle qualities depends on one's taste.

 

Whats this new intake manifold your speaking of? I dont plan on starting to build this engine until around feb. when I get in my new house. Right now, just writing down the ideas and prices to start buying parts.

Thanks, you guys are big help. So many things have changed over the past year.

Casey

 

I'm talking about putting this thing in a 5300lb truck not a 3500lb Fbody. Low and midrange torque are a trucks best friend.

This will be more of a daily driver type setup than an all out eek out the last hp setup also.