Comp Cams

[Flash68]

Originally Posted by Sieg

Here's the cam card: http://www.compcams.com/Company/CC/c...csid=1411&sb=0

I like that 2000-7000 rpm range.

2000-7000 rpm range?

Nice work by the marketing department.

[RdHuggr68]

Originally Posted by Flash68

2000-7000 rpm range?

Nice work by the marketing department.

Are you saying that range is pretty much BS?

[Flash68]

Originally Posted by RdHuggr68

Are you saying that range is pretty much BS?

Those ranges are an arbitrary measurement anyway so I wouldn't worry too much about it.

[Twoblackmarks...]

Maybe I should not answer since I have no experience With LS, but anything over [email protected] I would think would be not very streetable (low end torque), but it really Depends on the rest of the engine, trans and rear end.

But People are different and may think something else than me, I looked over comps LS line of cams, and all seem to have much more Exhaust duration?

I think this cam would not be pulling very much before maybe 3000RPM, especially in an under 400cid motor.

But maybe the LS motors can get away With much more cam because of the good flow and long intakes and such.

This one I would say is maximum for street use in a good engine but still "fun", but I just used 5 minutes "researching" this...
http://www.compcams.com/Company/CC/c...csid=1402&sb=0

On a non-race car it is Nice to have the Power whenever you want it, just stomp on the pedal and there it is, dont have to wait for it

[Sieg]

Originally Posted by Flash68

2000-7000 rpm range?

Nice work by the marketing department.

Like I mentioned..............dyno charts.

My Edelbrock 5002 grind is 2,500-6,500.........marketing is accurate IMO........but that's from marketing 25 years ago.

[WSSix]

Originally Posted by Flash68

2000-7000 rpm range?

Nice work by the marketing department.

Pretty much! On an LS1/6 this cam will be dead down low ie under 3000 rpms and there are other factors involved that affect power band other than the cam. IMO, there's way too much overlap for a street car with this cam. However, everyone has mentioned how subjective streetable is and that's very true. You have to look at the total drive train and you're driving style. So what's the rest of the drive train look like on your car? What do you want power wise? I'm not referring to just the amount of power but where you want your power. What other engine mods, if any, do you have currently?

An example of a cam that I really like for all around street performance on an LS1/6, is a 228/232 on either a 112 or 114 depending on auto or manual trans. This was ground on Comp's XER lobe grind but they have changed their grind names so I'm not sure what new name corresponds. To me, this cam worked great on a stock LS1/6 with simply headers, exhaust, and normal gearing(ie mid to low 3.0s) but also would only get better with more mods like heads and intake. It was a simple off the shelf grind that works well for a street car. Nothing fancy or exotic. It just worked.

[RdHuggr68]

Originally Posted by WSSix

Pretty much! On an LS1/6 this cam will be dead down low ie under 3000 rpms and there are other factors involved that affect power band other than the cam. IMO, there's way too much overlap for a street car with this cam. However, everyone has mentioned how subjective streetable is and that's very true. You have to look at the total drive train and you're driving style. So what's the rest of the drive train look like on your car? What do you want power wise? I'm not referring to just the amount of power but where you want your power. What other engine mods, if any, do you have currently?

An example of a cam that I really like for all around street performance on an LS1/6, is a 228/232 on either a 112 or 114 depending on auto or manual trans. This was ground on Comp's XER lobe grind but they have changed their grind names so I'm not sure what new name corresponds. To me, this cam worked great on a stock LS1/6 with simply headers, exhaust, and normal gearing(ie mid to low 3.0s) but also would only get better with more mods like heads and intake. It was a simple off the shelf grind that works well for a street car. Nothing fancy or exotic. It just worked.

This cam is in a new LS3 with 11:5:1 comp. Diamond pistons,Callies crank 4" stroke Callies rods, heads milled and valve job. Fast FI intake.

[WSSix]

See, now the cam doesn't seem so bad. You're what 413 cu in now? That's a lot different than an LS1/6. You're actually on the small side for an engine this large. It will perform well, have good torque, a broad power band that starts low, and it'll be leaving a lot left on the table. Go bigger.

[RdHuggr68]

Originally Posted by WSSix

See, now the cam doesn't seem so bad. You're what 413 cu in now? That's a lot different than an LS1/6. You're actually on the small side for an engine this large. It will perform well, have good torque, a broad power band that starts low, and it'll be leaving a lot left on the table. Go bigger.

Thanks Trey, it is a 408ci and all new parts balanced ARP studs,should be sweet.
Kevin

[jwcarguy]

You didn't mention how you are going to use this engine/
But from asking "is this cam streetable" leads me to think that it will mainly be a street car with some track days? correct?
Auto or manual trans?
rearend gear ratio?

If so, also have to know if you Diamond pistons have valve reliefs, how much your heads have been milled, head gasket thickness and are you still running the stock 1.7 ratio rockers??
With that much duration (@ .050), you need to beware of what you ptv clearance is (piston to valve)

With the fist cam choice you have approx 13 degrees of overlap, which is high for a LS3 cylinder head (the intake valves are 2.165" compared to the exhaust valve at 1.59") that is why on these rectangle port heads, most cam recommendations have much more duration on the exhaust side to compensate for the size difference for proper exhaust gas flow

For my engine (LS2 6.0L w/ LS3 cylinder heads stock unmilled and intake setup) I contacted both "Pat G" @ Guerra Motorsports and "Spinmonster" from the Corvette world, both are some of the top LS EFI tuners in the country
Both of them explained about having too much overlap effects low end and driveability
here is a interesting read on the LS3 heads and cam specs vs performance/ driveability:
http://forums.corvetteforum.com/c6-t...-camshaft.html

My cam was custom ground by EPS:
226/234 .629”/.629” 113 LSA +2 advance (with 1.7 ratio rockers)
EPS ET/ET lobes on 8620 steel 3 bolt cam core
EPS26-2/EPS34-2 HR113 LSA +2 advance (111 installed intake centerline)

hope this helps,
Jeff