Go with the larger cam and Vic Jr. for sure !!

 

I agree w/ DZ, larger cam, along with other things, to ask for 460hp from 355cid.

With your gearing and trans, I would feel confident that the larger cam will srteetable, however, radical.

You, or your engine man, could place a call to CamHelp, Comps Techline, and ask for their input.

 

I would try a Lunati Voodoo solid roller, I have one and it pulls like crazy even before the low RPM number they give for the power range. The original grinder is back and he knows his stuff... I have used Comp Cams stuff for a long time, but after installing a few Lunati's I will never go back. Here are a few choices in the Voodoo lineup...

Part Number: 60131

Solid roller, rough idle. Good cam for high performance street or mild strip applications. Needs 2500-2800 RPM stall speed converter, 9.5:1 or better compression, aftermarket exhaust system and 3.73 rear gear ratio.

• Advertised Duration (Int/Exh): 267/273
• Duration @ .050 (Int/Exh): 237/243
• Gross Valve Lift (Int/Exh): .566/.578
• LSA/ICL: 110/106
• Valve Lash (Int/Exh): 016/016
• RPM Range: 2500-6800

Part Number: 60132


Solid roller, rough idle. Good cam for high performance street/strip applications. Needs 2800-3000 RPM stall speed converter, 10:1 or better compression, aftermarket exhaust system and 3.90 rear gear ratio.

• Advertised Duration (Int/Exh): 273/279
• Duration @ .050 (Int/Exh): 243/249
• Gross Valve Lift (Int/Exh): .578/.585
• LSA/ICL: 110/106
• Valve Lash (Int/Exh): 016/016
• RPM Range: 2600-7000

Part Number: 60133


Solid roller, rough idle. Excellent cam for high performance street/strip applications. Excellent mid to upper RPM torque and horsepower in 355-383 cubic inch engines. Needs 3000-3500 RPM stall speed converter, 10:1 or better compression, aftermarket exhaust system and 3.90 rear gear ratio.

• Advertised Duration (Int/Exh): 279/285
• Duration @ .050 (Int/Exh): 249/255
• Gross Valve Lift (Int/Exh): .585/.600
• LSA/ICL: 110/106
• Valve Lash (Int/Exh): 016/016
• RPM Range: 2800-7200

Here is the link to Lunati for some options. The Voodoo line is only one of the grind profiles they have, but they are BADD A$$!!

http://www.lunaticams.com/Category.aspx?id=58

 

Here are the cams I think will work well:

COMP XR274R
INT EXH
ADV: 274 280
0.050: 236 240
Lift: 0.564 0.570
LCA: 110
ICL: 106

or

COMP XR280R (uses the sames springs as the 274)
INT EXH
ADV: 280 286
0.050: 242 248
Lift: 0.570 0.576
LCA: 110
ICL: 106

I'm looking to build a healthy combination that is flexible, yet aggressive. The engine builder didn't even hesitate to recommend the XR274R, so I am wondering if the 280 would be worth it for top end power. With my steep gearing, I am even considering a Victor Jr. if
it wouldnt hurt the 2000+rpm power.

Power Goals:
460+ HP
Peak TQ around 4500rpm

What do you think?

Thanks!
Steven

I have the XR274 in my 406. 472 HP@ 5800, 495# T @ 4400.

I see just around 12" vac with this cam, which was a concern for me with power brakes. I did not want to install a vac cansiter, and my engine builder stepped down from the XR280 for this reason.

See my engine build/times.

 

Carry-over from my 327:
200cc Aluminum Pro Toplines, 64cc chambers
1.52 Pro Magnum Rockers
Weiand 7546, tall-ish dual plane manifold.
600cfm Edelbrock (which I will ditch for a 650+cfm asap)
1 3/4" Dougs headers

Drivetrain:
TKO 500 5 speed
3.73 rear end
Street tires.

Power Goals:
460+ HP
Peak TQ around 4500rpm

What do you think?

Thanks!
Steven

This is a Weiand 7546.

If you're looking for low mid-range power I would stick with a roller cam under 240° duration and use a smaller, longer set of headers, including a smaller collector, and a 750 cfm carb. We used a 240°/240° .41" lobe lift Camcraft cam in our 331" road race motor and got a torque peak around 4600 rpm, power peak around 7000.

 

For a NA motor I would look at something with a tighter LSA, like around 108. I have always had good luck with cams in that range.
I would reccomend calling a cam manufacturer, they will know better than anyone how their specific grind will work on your motor. Try giving Isky a call, http://www.iskycams.com/ I'm running one of their solid Rollers in my 406 and it works quite well, their tech is usually very helpful too.
As for the intake, if it's the one in the photo above I'd look at a newer design (dual or single) or a Victor Jr, those things just plain work.

 

the comp cams you picked have good specs. but there cast cores anything over 200lbs. on the seat is on the edge for these cores . 7000+ may be hard to control the valvetrain with less spring. yes vic .jr. or victor E. 750+ cfm.

 

Great posts,
Comp Cams for phone help, Cant go wrong with a Vic jr and a 750 . and let that baby eat

My 377 has 10- 1 compression Brodix track 1 heads ,Vic Jr, 254-260 AT .050 !!!!! and 580 lift witha 373 gear and a Tremec I love the Camshaft //Comp cam 12-773-8

417 Rear wheel HP

Power Brakes are just OK

 

Seriously, thank you all for your posts. The top level knowledge and experience on camaros.net (and the willingness to share it) never ceases to amaze me...keep it coming!

Manual brakes so I'm not concerned with vacuum...

Yes that's my manifold...its unique because it includes a plenum divider plate that slides in, essentially converting it to a dual plane. I haven't been able to test the difference. It sounds like many of you support the Victor Jr, which does surprise me a bit because I guess it has been in my head that the engine gets too peaky for the street. It sounds like the Victor Jr. is the way to go, especially if I get into the 240's in duration

As for the cam, I have a call into COMP, and will check out Lunati and Isky too. Thanks guys, the best advice IS to ask the experts. Any other opinions/experience with the solid rollers appreciated.



I see we have the same taste in engines. My dream engine has always been the 377 that will rev to 7500 like a bat out of hell. I know your cam is a couple steps higher, but since we're both working with the 3.48 stroke, how would you describe your powerband? Would you say you're ever "waiting" for power?

Thanks!
Steven

 

Honest 460hp wouldnt be hard with ported heads.
If theyre not ported it will need more cam to do it.

 

Do yourself a favor and call UDHarold here

(662) 562-4933

and ask him to spec a cam for your combination.

Can't get much better than a UDHarold spec'd cam by me!

And please say hello from ol' pdq67 to Harold if you do.

And I'm serious as a heart attack here too.

pdq67

 

XR280 or 60132 or a Similar Crane

Dont use the std core comp, Use a billet core so you can run more valve spring pressure so you dont float the valves and end up with a total mess

With either cam i would go with 110 degree lobe center if you want more street manners than anything,, If N/A and you want MAX performance at the track have either cam ground on a 106 lobe center

It would work good as a 327 too but the 327 would need no wider than a 108 lobe center due to the short stroke

 

I would go with the bigger cam and the 750 carb perferrably double pumper.

The thing will scream. I would also put some 1.6 to 1 roller rockers on her. I have the 12-772-8 comp cam. DZ has the step up from me and I am wondering how he likes that?

Also get the Victor Jr or something similair the cams you are talking about are all mid to high rpm power cams and the vic jr is the same thing. The intake you have now is low to mid range power and is totally missmatched to your cam and what you are trying do.

Also youre heads were pretty big for a 327 but would be great for a 355 with a larger cam in it. As for cam manufacturers everyone will swear by a different manufacturer thats the way it is. Personally for me I go with what the head manufacturers recommend for cams. Ask your head maker what they recommend after telling them what you are trying to do. Cams have to be tuned to the flow characteristics of the heads to truely unlock an engines potential since it is careful timed opening and closing events along with durations and ramp rates to ensure optimum filling of the cylinder all which are affected by the flow characteristics of the head. NO one cam will be better than the other it all depends on the heads, intake and exhaust and how its matched.

 

DZ Loves his cam and motor !! Last spring I put the # matching 302 back in with the muncie instead of the Tremec and my life hasnt been the same since.

I got the idea for the cam from a article in a magazine 520 hp in a ZZ4 short block with AFR heads. Here is the link

http://airflowresearch.com/articles/article054/A-P1.htm

 

Thats almost my exact setup. The cam in that engine was the 12-772. I have the afr 210's on a 383 with alot of other parts matched to it. Hoping in the 600+ range. Not to mention those are the older style eliminators so I think 600 plus should be very obtainable.

That article just shows how matched parts can make a world of difference. It wouldn't be a bad article to base your build off of.