Cam combo advice/input? - Team Camaro Tech
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post #1 of 10 (permalink) Old Oct 27th, 05, 03:05 PM Thread Starter
 
Join Date: Mar 2004
Posts: 537
Cam combo advice/input?

My specs are as follows:
Comp Cams Hydraulic Flat Tappet Grind # CS XE268H-10
Summit Racing URL Summit Link to # CCA-12-242-2
71 350 Block (.030 over, Don't know if its a 4bolt or 2 bolt main)
Speedpro .030 over Hypereutic pistons
Unknown crank, Unknown Rods
Edelbrock Performer RPM #6089 64cc chamber heads, w/ full Port & Polish
(2.02 Intake valve, 1.6 exhaust stainless steel valves, heads machined for valve retainers not the cheapie steel discs)
Edelbrock Performer RPM #7501 Air Gap Intake w/ Port Match
Edelbrock 1411 750cfm vac secondary carb
ATI SFI Approved Balancer
Crower 1.5 Stainless 7/16" Full Roller Rockers
Comp Cams Pushrods
Hooker Supercomp 1 & 5/8" Ceramic Coated Headers to a 3" X Pipe with Flowmaster 50 Series
(Unknown Stall, 3.73 Gears)
MSD 6A & Blaster SS Coil w/ Taylor 10.4 wires.

I want to get up to the 6000rpm range and make more power overall, is the setup i have the most streetable it could be? What would you guys do differently in terms of cam and valve train to get more power? Or am I probobly at the limits of my bottom end? (assuming it were a cast crank and rods)

tell me what you guys think?

thanks,

Cody

Last edited by aonghus; Oct 29th, 05 at 02:08 PM.
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post #2 of 10 (permalink) Old Oct 28th, 05, 05:37 AM
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Don
 
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Re: Cam combo advice/input?

Good cam selection. Do you really need 3" exhaust with that cam? Hope you are running MSD ing.

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #3 of 10 (permalink) Old Oct 28th, 05, 04:41 PM Thread Starter
 
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Re: Cam combo advice/input?

yes, I am running MSD 6A, considering moving to Digital 6 or fuel injection? (blaster SS coil and taylor 10.4 wires, yes i know, overkill but it was $20 more for the 10.4's.)

The 3" is negotiable, as I'm going to have to redo my entire exhaust anyway. If i moved to a beefier cam would the 3" make more sense?
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post #4 of 10 (permalink) Old Oct 28th, 05, 04:57 PM Thread Starter
 
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Re: Cam combo advice/input?

what about this cam?

CCA-12-246-3

little more eccentric exhaust (230 @ 0.50) and intake (236 @ 0.50) duration, would that give me a little more top end?

could I benefit from 1.6 rockers? and again, what about a hyd roller or solid roller?
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post #5 of 10 (permalink) Old Oct 29th, 05, 10:39 AM Thread Starter
 
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Re: Cam combo advice/input?

c'mon 75 views and 1 response?
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post #6 of 10 (permalink) Old Oct 29th, 05, 12:19 PM
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Dave
 
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Re: Cam combo advice/input?

I have same cam (XE268) in a 350, with Dart Sportsman iron heads; pretty much same engine as you. I had a bunch of different cams in the 350. Debated supercharger or turbo, then decided to just put in a built 454. I still got the 350 sitting on the floor, maybe for another project car. I kinda liked the XE268 in the 350, but just wanted more torque so I moved up to big block.

The thing with cam swaps is: it's hard to predict an exact outcome unless you are working off a proven engine "recipe". I been swapping them in and out of Chevy big and small blocks for over 30 years and it's always kind of a "best guess" situation. As we all know, a bigger cam does not always mean more power. The whole engine and drivetrain have to be matched to the cam, otherwise performance and driveability can take a hit.

Your engine sounds pretty good as is. Have you checked all your tuning issues? Timing? Jetting? What's your cranking compression: if it's much below 160 psi then you'll need more compression for bigger cam to work properly.

Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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post #7 of 10 (permalink) Old Oct 29th, 05, 12:36 PM
 
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Re: Cam combo advice/input?

Quote:
Originally Posted by Chevy-SS
I have same cam (XE268) in a 350, with Dart Sportsman iron heads; pretty much same engine as you. I had a bunch of different cams in the 350. Debated supercharger or turbo, then decided to just put in a built 454. I still got the 350 sitting on the floor, maybe for another project car. I kinda liked the XE268 in the 350, but just wanted more torque so I moved up to big block.

The thing with cam swaps is: it's hard to predict an exact outcome unless you are working off a proven engine "recipe". I been swapping them in and out of Chevy big and small blocks for over 30 years and it's always kind of a "best guess" situation. As we all know, a bigger cam does not always mean more power. The whole engine and drivetrain have to be matched to the cam, otherwise performance and driveability can take a hit.

Your engine sounds pretty good as is. Have you checked all your tuning issues? Timing? Jetting? What's your cranking compression: if it's much below 160 psi then you'll need more compression for bigger cam to work properly.
I would pretty much agree. You can call 6 cam companies and get 6 different opinions and thats their business. I know I have done it and couldnt believe the range of cams I got. This was giving the exact same information to each company and asking for their best recomendation on a solid roller. I was blown away I had everything from .550 lift to .680 lift 230 to 260 duration @.050 recomended it was a real shocker. This was for a F/T 400 smblk 5.7 rod Brodix T1 head 800cfm HolleyTeamG intake 2" primary header PG tranny W/brake 5:13 gear 31" tall slick in a 2100lb Camaro Needles to say there wasnt a whole lot of people locally running this 10yrs ago to copy.
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post #8 of 10 (permalink) Old Oct 29th, 05, 04:34 PM
 
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Smile Re: Cam combo advice/input?

Imho, the smaller of the two for a bit more down low and the bigger of the two for more upstairs!

OTHERWISE, they both will do nicely!!

Take your pick!!

pdq67

PS., one other point but I don't know if it applicable here or not so you might check with CC on this!

Your static compression ratio just MAY be a schosh high for the smaller cam???

B/c I think CC say's their smaller XE cams build alotta cylinder pressure b/c of their fast timing events...

AND I say this b/c an old L-48, 350 motor was spec'ed at 10.25 CR. but generally was right at 10! (4-notch flat-top pistons and 64 cc heads!!).... And your's spec's out a whole lot like an old L-48 motor!!



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post #9 of 10 (permalink) Old Oct 29th, 05, 05:11 PM Thread Starter
 
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Re: Cam combo advice/input?

awesome thanks for the input guys

pdq, I think I forgot to list it, but my pistons have (2 notch) 5cc valve reliefs, from the compression calculator I get 10.4:1

car drives great, just has zero 'go' power in the top end, hell I'm probobly fine with my current cam, but I was thinking the top end would be more useful for overall 1/4 mile times giving me extra pull in the higher range, whereas my current cam would be better for 60 foot times?

I plan on switching to a 5 speed or 6 speed eventually, and sticking with my 3.73 rear end

man I wanna get my motor dyno'ed now....


is there any benefit for me running a hydraulic roller or mech roller on the street? what about 1.6:1 ratio rockers? also, I planned on replacing my springs, are conical springs and titanium retainers worth it? (i dont care how much it costs)

Last edited by aonghus; Oct 29th, 05 at 05:48 PM.
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post #10 of 10 (permalink) Old Oct 29th, 05, 06:53 PM
 
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Smile Re: Cam combo advice/input?

That's why I mentioned CR.

As for rollers, a hy-roller is OK, (although rpm limited unless a rev-kit is used), but a solid roller cam is a lot better EXCEPT when ran on the street!

Imho, race solid rollers tend to eat lifter axles and needle bearings due to poor oiling at low to cruise rpm useage b/c of spring pressures! AND there goes a motor in short order!

I want the hp a solid roller makes over a solid lifter cam, BUT I will NOT risk a motor street driving it with one until they are a lot more reliable! And I've considered them all.

I'm not talking about hy- any cams here either!

And fwiw, I do figure a CC 280AR-10 for a SB and the 288AR-10 for a BB street solid roller cam is about right for a powerful street motor AND should be faily long lived to boot.

pdq67



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