Generation IV Internal Engine - 408 cam? What are you guys runnin?

my 408 is currently at the machine shop being built. I'm runninig the CNC'd LS3 heads from TSP and hopefully going with a FAST setup. What cam are you guys running?

I have a TSP 418, using a LG G5X3 114 (234/242 .600 .610) I also retarded the ILC to 114 from 110 to shift the power band up a bit. Still more than enough low rpm torque.

Idles nice at 950 rpm, just a slight low rpm/light load surge at 30 mph in 4th gear.

A customer has a 2010 Camaro with a Comp LSR 227/243 cam, Kooks headers & exhaust, Fast 102 intake, stock heads & short block. Very quiet cam, and barely any low rpm/light load surge.

Russ Kemp

Thunder Racing stroker cam

I have a tsp 408 running a comp lsr cam. 239/247 624 624 114. so far has been a great cam that has been Great on the street.

I went with a 243/255

I have a tsp 408 running a comp lsr cam. 239/247 624 624 114. so far has been a great cam that has been Great on the street.

This is very close to what I would run. Have one with a little less intake duration that makes 530 to the tires in a six speed vette. I think ICL was 111.

I am running the comp cam 239/247 624 624 113 LSA +2 and loving it.

No matter what anybody is running, get something spec'd. Its not much more than a cam off the shelf and its tailored to your car and combo.

Call Geoff@EPS or get with PatG on here.

No matter what anybody is running, get something spec'd. Its not much more than a cam off the shelf and its tailored to your car and combo.

Call Geoff@EPS or get with PatG on here.
THIS.... I see two cams in here that were originally specd for my 408 (no real facts about my car but more for results they have seen in previous 408's they built) and I went to Pat G for a true custom spec cam for my exact setup instead of a cam that works well in just a 408.

I will have a 274/298 .748"/.714" 116+5 in my 408, but that's just me:D

Seriously though I would look for something in the 243/255 113+3 range. Depending on the valve weight, and weight of the rest of your valve train will really determine what cam profile(lobe intensity) you should use.

I could custom spec you something for the same price as on off the shelf cam(389.99), as our stroker cams are not quite ready to be released yet.

Texas Giant, no street manners, let it eat...

What would be equivalant to an MS3 on an LS1 cam specs wise?

What would be equivalant to an MS3 on an LS1 cam specs wise?


That's kind of hard to theorize(it's actually not that hard) but since this set-up is using LS3 heads it needs different valve events on the exhaust side to evacuate the cylinder efficiently while using the LS3 heads.

If you were going to be using cathedral port heads and wanted a MS3 equivalent then I'd look for a 247/252 .624/.595 112+3.

For the LS3 heads though I would want something like this: 247/262 .624/.597 112+3(more aggressive idle) or 247/258 .624/.597 113+4(slightly calmer idle but still going to have a good ca-chunka chunk)

On a 408 with Trick Flow 235 cathedral port heads, how about cam specs of 244/248, .612"/.615" in either 112 or 114 LSA. This would be mainly a weekend cruiser with occasional trips to the drag strip for test and tune. Would it have decent street manners and still have good power?

On a 408 with Trick Flow 235 cathedral port heads, how about cam specs of 244/248, .612"/.615" in either 112 or 114 LSA. This would be mainly a weekend cruiser with occasional trips to the drag strip for test and tune. Would it have decent street manners and still have good power?

Do you already have this cam? I'm not a big fan of the XER lobes unless your valve train is light and can handle the aggressiveness of those lobes. Aftermarket rockers even though heavier than stock rockers seem to do slightly better with the XER lobes in regards to valve stem tip longevity.

I'd like to see something with a slightly later IVC on a 408, but it would work if you already have it in your possession.

My first suggestion (247/252 .624/.597 112+3) is what I would use in a street 408 that wanted good street manners while still making the most of having those cubic inches. If you wanted something that would last a little longer on the springs and give up a little hp you could do a 246/252 .615/.595 112+3.

I'm still running a stock cube motor, just trying to plan what to do when I build a stroker.

That cam you mentioned, (247/252 .624/.597 112+3), is that LSL intake lobes and XE exhaust lobes? I'm not familiar with LSL lobes.

I'm still running a stock cube motor, just trying to plan what to do when I build a stroker.

That cam you mentioned, (247/252 .624/.597 112+3), is that LSL intake lobes and XE exhaust lobes? I'm not familiar with LSL lobes.

LSL intake and Extreme RPM exhaust.

I can't really find much info about the LSL lobes other than supposedly they are quicker off the seat and not as aggressive as the XER lobes. I'm assuming this means the LSL lobes are slightly more stable and a little easier on springs compared to XER lobes, right?

EDIT: I found another source that says LSL are softer off the seat and then get aggressive. Hard to figure this out when I'm reading conflicting info. The LSL seems to be between XER and LSK as far as lift.

I can't really find much info about the LSL lobes other than supposedly they are quicker off the seat and not as aggressive as the XER lobes. I'm assuming this means the LSL lobes are slightly more stable and a little easier on springs compared to XER lobes, right?

EDIT: I found another source that says LSL are softer off the seat and then get aggressive. Hard to figure this out when I'm reading conflicting info. The LSL seems to be between XER and LSK as far as lift.

This is the correct.

Thanks for the info. I will probably call you when I get closer to building a stroker. We now return to the regularly scheduled thread.

No problem.

On a 408 with Trick Flow 235 cathedral port heads, how about cam specs of 244/248, .612"/.615" in either 112 or 114 LSA. This would be mainly a weekend cruiser with occasional trips to the drag strip for test and tune. Would it have decent street manners and still have good power?
I have a TSP 408 with TEA TFS 235 and posted my cam specs. Although that is a nitrous cam. My last cam had the LSL and XER lobes and the XER lobes were too aggressive for my stock valves. Thats how i ended up with a 408. I'm running the hud lobes or what ever they are called. I'd have to look at the slip again. The are like an aggressive marine lobe as explained to me by Pat G.

I have a TSP 408 with TEA TFS 235 and posted my cam specs. Although that is a nitrous cam. My last cam had the LSL and XER lobes and the XER lobes were too aggressive for my stock valves. Thats how i ended up with a 408. I'm running the hud lobes or what ever they are called. I'd have to look at the slip again. The are like an aggressive marine lobe as explained to me by Pat G.

HUC lobes, they are modeled after the Extreme Marine lobes which are a great lobe, especially for boost or heavy valve-trains.

Thanks Martin, I knew it was HU....something. Can't wait to see how it runs.

402ci LS3 heads
239/253 .637/.637 112 by Geoff@EPS Awesom cam from awesom guy

EPS cam on HUC lobes, 243/247 114 + 2.

I'm running a 255/271 .624/.624 115 lsa cam in my 408

My buddy runs a sponser grind in his 402 i believe its a 247/252 or around there. Lift is in the low 6's and 112 LSA. Car runs great and makes around 530-550 RHWP.

Got my cam specs from pat g. 235/242 .638/.615 112+3LSA. Thoughts?!

Got it from Patrick G? don't even think about it, just try it!!!!

Got my cam specs from pat g. 235/242 .638/.615 112+3LSA. Thoughts?!

I'd like to hear his thoughts on why he chose to shorten the exhaust duration so much when your going to be using a LS3 cylinder head.

Knowing these heads have poor I/E% and using such a short exhaust duration on a 408 goes against what has made great power before with this combination in mind.

What did you tell him you wanted from this cam? Or did you just say, "Spec me a cam for a 408 with LS3 heads"?

I'd like to hear his thoughts on why he chose to shorten the exhaust duration so much when your going to be using a LS3 cylinder head.

Knowing these heads have poor I/E% and using such a short exhaust duration on a 408 goes against what has made great power before with this combination in mind.

What did you tell him you wanted from this cam? Or did you just say, "Spec me a cam for a 408 with LS3 heads"?

I dont like where this is going.....and i filled out his 4 page piece of paper with all my car mods, etc on it and emailed it to him. Specifically stated i was looking for a cam with a nice lope to it and wanted something to "give me the best bang for the buck to match my CNCd Ls3 heads".....

Just run it. IMO. If I ever get my swap ruinning/on the road, It will get a Patrick G. VVT cam. CAM seams to be having good luck with his Pat G. VVT cam.

I dont like where this is going.....and i filled out his 4 page piece of paper with all my car mods, etc on it and emailed it to him. Specifically stated i was looking for a cam with a nice lope to it and wanted something to "give me the best bang for the buck to match my CNCd Ls3 heads".....

Sounds like Patrick had more information on which to base his recommendation than is given in this thread. So, that may have something to do with the disparity.

Also, I have often noted Patrick saying that he does not believe square port heads need a much spread as other like to run on them. So, his recommendation does not surprise me.

Sounds like Patrick had more information on which to base his recommendation than is given in this thread. So, that may have something to do with the disparity.

Also, I have often noted Patrick saying that he does not believe square port heads need a much spread as other like to run on them. So, his recommendation does not surprise me.

IDK if you've ever seen the form he has his customers fill out when asking for a cam, but its VERY detailed. and i've never heard of anyone not satisfied with a cam he's specked for them so i have faith!!

I never said anything was wrong with it.

I respect him a lot which is why I said I would like to hear his thoughts. You can always learn something from someone like him.

Ease up guys no bashing here.

Maybe some ballpark recommendations on a cam for a TSP 408 with TFS 225cc heads? Sorry for the thread-jack lol. -8cc dish pistons, wanting a very lopey cam idle, street driven the majority of the time. Only revving it out to 6500. It is a Gen III block though, so this probably isn't the best section...

Maybe some ballpark recommendations on a cam for a TSP 408 with TFS 225cc heads? Sorry for the thread-jack lol. -8cc dish pistons, wanting a very lopey cam idle, street driven the majority of the time. Only revving it out to 6500. It is a Gen III block though, so this probably isn't the best section...

408, TFS 225, 247/251 114 - Street car and it drives great.

Idle video.
http://youtu.be/EOWhC02owX8

If you need more details shoot me a PM.

What kind of rwhp did you make with this cam

What kind of rwhp did you make with this cam

408, TFS 225, 247/251 114, Fast92 W/92 TB, ARH 1 7/8.

PB Lvl 2, Circle-D 4000 conv./stall, MWC 9'' 3.70 gears.

315 MT, 17x11 ZR1 wheels.

498rwhp - 460 rwtq