[ssmike]

I want to do a cam but leave the stock exhaust in place. I love the sound the way it is with the Solo Performance axleback and stock cats! If I do a cam will it be ok with stock cats? I just don’t want to do headers because it’ll be too loud. I know I’ll be sacrificing a bit of power due to the restrictions of the cats but I’m really wanting that badass lumpy idle with a decent bump in power. I don’t race so it would be a street friendly cam. Your thoughts are appreciated!

[oldman]

I’d go with a cam similar to the LS7 spec. It was made to work with a similar header and factory cats and last a reasonable time. 211 / 230. 12X LSA.

https://www.hotrod.com/articles/ls-cam-test-comparison/

I know these are not LT1s.

Comp has a 216 / 228 AFM..

Both cams idle...you would have to custom spec a 216 / 228 112 LSA or even bigger for an aggressive idle. 228 / 240 on 112 would be about the limit. This is close to the hot cam, also made for stock header. Hot is 228 / 248 on 112

[oldman]

Oh and I don’t think the bigger ones will work well on auto with stock converter

[ssmike]

Mines a manual so no worries about TC

[KingLT1]

Yes you can install a cam with stock exhaust...Kip from cam motion put a low lash solid roller in his C6 Vette with stock exhaust. The 6th gen SS has much better flowing Tri-Y's then the C6 manifolds. Call Cam Motion and tell them what you are looking to do.

[oldman]

The smaller cam motion cams are around .600 lift. I'm lift phobic now especially for a car where ultimate power is NOT the goal. I'd dive up 20 to 30 HP for a cam that can go 100K.

[oldman]

Grind Number: XA218/330-XA228/325-14+5
Hydraulic Roller Camshaft
Aggressive Performance
Duration at .050": 218/228
114 Lobe Center Angle with a 109 Intake Centerline
Lift with 1.8 Rocker Arm Ratio: .594"/.585"
Recommended Displacement: 6.2 Liter Engines
Cylinder Heads: Gen 5 LT
Recommended Compression Ratio: 9.50-10.5:1
Recommended Headers: Stock Manifolds, 1 3/4" - 1 7/8" Headers
Recommended Stall Converter: Stock
Recommended Rear Axle Ratio: 2.85-3.90
NOTE: Requires use of Cam Motion VVT Phaser 4 degree Limiter Block

The TITAN I Gen 5 LT camshaft is designed for mild street performance in cars using 6.2 liter LT engines. The TITAN I Gen 5 LT cam will have a mild performance idle and strong low end to midrange power. This camshaft will work well in completely stock vehicles but will enjoy performance benefits when used with headers, high flow exhaust and increased stall speed torque converter and high flow intake systems.

Note that this will NOT have a loope de doop... but I would select this as optimal. Please remember, that anything bigger is going to need the red line raised and at some point the rod bolts become suspect 6800 to 7200, depending on cam, sure the red line can be set lower but you would be falling off cam during the shift... but you already said performace is not the number one goal.
http://www.cammotion.com/gen-5-lt-ca...formance-cams/

[oldman]

Originally Posted by KingLT1

Yes you can install a cam with stock exhaust...Kip from cam motion put a low lash solid roller in his C6 Vette with stock exhaust. The 6th gen SS has much better flowing Tri-Y's then the C6 manifolds. Call Cam Motion and tell them what you are looking to do.

IMO, the Vette manifold flows better. The Camaro headers have a 2.1" ID collector flange. The Vette is dunno maybe 3" equivalent. The manifold or header is only as good as its smallest portion and at some point 2.1" ID is heck of small. Is the Camaro setup better for reasonable NA power? Probably so, is there a point that the Vette manifold better? IMO at 750 up engine HP, FI... the Vette manifold is would be a better choice (if there was a choice), mainly due to its massive collector size, but also the heat retention for high-HP FI. I would admit it would make a great dyno comparison both NA and forced. So I think it is a all depends on question and IMO it would come down to a whole lot.


https://www.ebay.com/itm/Chevrolet-C...-/253486978597

[KingLT1]

Originally Posted by oldman

IMO, the Vette manifold flows better. The Camaro headers have a 2.1" ID collector flange. The Vette is dunno maybe 3" equivalent. The manifold or header is only as good as its smallest portion and at some point 2.1" ID is heck of small. Is the Camaro setup better for reasonable NA power? Probably so, is there a point that the Vette manifold better? IMO at 750 up engine HP, FI... the Vette manifold is would be a better choice (if there was a choice), mainly due to its massive collector size, but also the heat retention for high-HP FI. I would admit it would make a great dyno comparison both NA and forced. So I think it is a all depends on question and IMO it would come down to a whole lot.


https://www.ebay.com/itm/Chevrolet-C...-/253486978597

I said C6 Vette not C7. That being said the C7 stingray and GS have worse flowing manifolds then we do. The Z06's both C6 and C7 are indeed better.

[oldman]

Yes I saw you said C6 and since this is a LT1, I limited my comment about LT1 factory manifolds / headers flows. I've listed my opinion above. I don't know anything about c6 at all.

if the base C7 outlet is bigger than 2.1" ID how are you determining they flow poorly, just asking. . I have no idea if there are different C7 manifolds but take your word for it.

I looked at a ported C7 don't know if there are different types and the entrance is 2". So say stock unported is 1.8 what is the Camaro 1.6 or even smaller (I can measure it ) I did post when I took mine off. So if the tube size on the Vette is way bigger and the exit is way way way way bigger, why does it flow less?

So I'll just leave it at that, IMO the Vette manifold flows better under the conditions listed above, but due to the tri-Y design and longer tubes, NA with mild cam the Camaro manifolds probably perform better over the RPM range of intended application. Neither works well with big cam, once again IMO.

https://www.gmpartsstore.com/v-2018-...haust-manifold

It would seem the C7 Z06 and C7 base take the same gasket and exhaust shield. So outside of the stainless material and maybe some bigger passages with thinner walls. They are very similar (base on gaskets and shields.
https://www.gmpartsstore.com/v-2018-...haust-manifold

visual the ZR1 manifold is at least similar:
https://www.gmperformancemotor.com/category/GVLT.html

[KingLT1]

Point remains that the OP could cam his car with stock exhaust, it will just be leaving some power on the table. It definitely goes against the grain of how most mod their cars. Honestly he would be better off installing a supercharger.

[GuywithL86]

Originally Posted by oldman

The manifold or header is only as good as its smallest portion and at some point 2.1" ID is heck of small.

Just so you know (i had a major ah ha moment when I learned this) that is not really true.

Hose A- 50ft 2” diameter hose
Hose B - 50ft 3” diameter hose in which in the middle there is a few inches of 2” diameter (aka a 2” restriction”)

Despite what you’d think, hose B would crush hose A in flow.

It’s not just the diameter, its the length at that diameter

[ssmike]

Originally Posted by KingLT1

Point remains that the OP could cam his car with stock exhaust, it will just be leaving some power on the table. It definitely goes against the grain of how most mod their cars. Honestly he would be better off installing a supercharger.

Cost is a factor otherwise I’d be going FI all the way!

[oldman]

Originally Posted by KingLT1

Point remains that the OP could cam his car with stock exhaust, it will just be leaving some power on the table. It definitely goes against the grain of how most mod their cars

bout sums it up.

Honestly he would be better off installing a supercharger.

each to his own, I liked going thru the steps and the OP likes the sound more than the power. So I suggest some cams that would work aka perform as intended with stock exhaust manifolds and some that are too big.
The Cam Motion base cam would make the best choice given the build but it is not lumpy.
The Hot cam would have a define lump and even though I think it is way too big, GM designed it for this application. The power curve actaully looks spot on too. I don't know as obviously it is a BIG duration small LSA cam.