camshaft specs

[bwkelley76]

What's the biggest cam anyone has ran in a 4x4 chevy truck SBC 350 with manual trans?

I don't want to "over-cam" and I'm looking at a COMP 280H. 280 adver. duration with 110 lobe center and 480 lift.

(75 chevy shortbox with a 350, 35's, 203 case, and an SM 465)

[florida4x4]

what type of wheeling are you going to do with it?

[dick_landy]

also you need to factor in gear ratio and tire size. bigger the cams make less power down low. unless its a mud racer, 280* duration is too big for wheelin in my opinion

[trkklr77]

the big comp 4x4 cam is a little lumpy and still makes down low good power. its a .480 x .498, a very good cam.

[bwkelley76]

Originally Posted by florida4x4

what type of wheeling are you going to do with it?

snow and little bit of everything with a little pavement pounding mixed in.. ;o) Not going to be a crawler or anything. ..at least not yet.

[77k5]

Originally Posted by bwkelley76

What's the biggest cam anyone has ran in a 4x4 chevy truck SBC 350 with manual trans?

I don't want to "over-cam" and I'm looking at a COMP 280H. 280 adver. duration with 110 lobe center and 480 lift.

(75 chevy shortbox with a 350, 35's, 203 case, and an SM 465)

I have a 383/465.

276/284 adv. duration with .488"/.509" lift hydraulic roller cam.

In a buggy used solely in the rocks.

It makes plenty of low end torque.

[florida4x4]

the 280 is a little fat for my tastes. I'm running a 211@.050 with .472 lift and 1.6 roller rockers. plenty of torque on the low end

[Grumpy_old_fart]

the 280 will be PERFECT in your application.

[Jay02insd]

I run comp cams 4x4 cam pn# 239-3 262/270' .462/ .480 and it is perfect alot of low end. and the idle has a little lope. I am gonna step up one to the 243-3. .480/ .498

[bwkelley76]

Originally Posted by Jay02insd

I run comp cams 4x4 cam pn# 239-3 262/270' .462/ .480 and it is perfect alot of low end. and the idle has a little lope. I am gonna step up one to the 243-3. .480/ .498

I thought about this cam but wasn't impressed with the 111 lobe center angle. If it has a nasty lope at an idle I'm sold on it.

ANYONE KNOW WHAT THIS CAM SOUNDS LIKE AT IDLE ON A SBC????

[bwkelley76]

Originally Posted by Grumpy_old_fart

the 280 will be PERFECT in your application.

I'm with you on the 280H cam except I've heard such good reviews on the extreme energy cam described above by Jay. I ran the 280H in a street car years ago and I loved it! ...wasn't the best on low-end power though but damn it screamed at the top. Of course we all know it is all correctible with gearing, etc. but still. I have a 5000 lb truck now, not a car.

A friend of mine ran the X-treme cam in a HEAVY street car and it actually performed damn good.

Unless someone knows something I don't I believe this is the cam I will go with.


... 243-3 Comp Extreme Energy. :o) ANY OBJECTIONS??

[Tim84K10]

Single pattern cams are old technology and outdated. Use a dual pattern camshaft, there is a reason that they were developed.

I am running an Xtreme Fuel Injection cam with about 218-225* of duration @ .050" in my 383. Mine is pn 12-365-4

[bwkelley76]

Originally Posted by Tim84K10

Single pattern cams are old technology and outdated. Use a dual pattern camshaft, there is a reason that they were developed.

I am running an Xtreme Fuel Injection cam with about 218-225* of duration @ .050" in my 383. Mine is pn 12-365-4

EXACTLY! Until I got into fuel injection and higher-technology HP builds about 5 years ago I would have thought you were crazy. Although my current beast is carbourated I still like living in the technological TODAY. FORDS are actually some of the first to use dual-pattern cams because their heads really lack in the exhaust dept, but that's a whole other story.

Sticking to the story (CHEVY) here I agree that dual pattern cams really make a world of difference. ...Not sure what I was thinking with the 280H, although it is a good street-car cam.

[Grumpy_old_fart]

Learn more here

[walla2k5]

Give this a listen. Same 280H I have in my K5.

http://www.compcams.com/Base/MultiMe...ompCams280.mp3

[Grumpy_old_fart]

if youre going for sound, you may not always be going for performance... but thats just an opinion.

[bwkelley76]

Originally Posted by walla2k5

Give this a listen. Same 280H I have in my K5.

http://www.compcams.com/Base/MultiMe...ompCams280.mp3

yep, the 280 is a good sounding cam. It's what I had in my street car about 6 years ago. Im' really curious what the larger extreme 4x4 cam sounds like. I like the specs now that I have looked more into it.

[rockhog]

I run the comp 280H in my 454 powered Jeep. Its very lumpy and sounds nasty. What the comp ratio on your motor?? What gears?? If you want a nice little rumpy idle I would no doubt go with a Crane 274HO6 I thinks its call. It sounds as good as the 280H but has a much lower powerband. Its 218 at .050 but ground on a 106LSA. Trust me...you will love it.

[bwkelley76]

Originally Posted by rockhog

I run the comp 280H in my 454 powered Jeep. Its very lumpy and sounds nasty. What the comp ratio on your motor?? What gears?? If you want a nice little rumpy idle I would no doubt go with a Crane 274HO6 I thinks its call. It sounds as good as the 280H but has a much lower powerband. Its 218 at .050 but ground on a 106LSA. Trust me...you will love it.

I think the 280H is much better for a lighter rig in my case. I looked up that crane cam

CRN-100172 is the SBC part #.

Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,200-5,200
Intake Duration at 050 inch Lift: 218
Exhaust Duration at 050 inch Lift: 218
Duration at 050 inch Lift: 218 int./218 exh.
Advertised Intake Duration: 274
Advertised Exhaust Duration: 274
Advertised Duration: 274 int./274 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.450 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.450 in.
Valve Lift with Factory Rocker Arm Ratio: 0.450 int./0.450 exh. lift
Lobe Separation (degrees): 106


I like the LSA but not happy with the other specs. I bet it sounds killer at an idle! NOTE though that the rpm range is narrow, 2,200-5,200. I think it would be a much better cam with a 1.6 rocker instead of a 1.5.



Here is the comparison to the cam I'm seriously looking at...

The largest of the Comp Extreme Energy 4x4 cams.

Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,800-6,000
Intake Duration at 050 inch Lift: 226
Exhaust Duration at 050 inch Lift: 234
Duration at 050 inch Lift: 226 int./234 exh.
Advertised Intake Duration: 270
Advertised Exhaust Duration: 278
Advertised Duration: 270 int./278 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.480 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.498 in.
Valve Lift with Factory Rocker Arm Ratio: 0.480 int./0.498 exh. lift
Lobe Separation (degrees): 111
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.

Supposedly the ramp speeds on this cam are suppose to be the key to it's great low-end torque as well as mid-high rpm horsepower.
I do wish it had a lower LSA though. However, even a 112 with a 230 @ 50duration has a decent lope to it.

[rockhog]

What is the specs of your sbc???

[Jay02insd]

226/234 . That's gonna chop!!!

[bwkelley76]

Originally Posted by rockhog

What is the specs of your sbc???

8.5/1 compression 350. Brand new GM Goodwrench motor. Nothing special. Stock heads/valves, etc. This is another reason I'm chosing this cam as it makes up for lack of compression and cyl. head flow with ramp design. I've heard good things about this cam with basically stock setup. Of course I will have headers and free-flowing exhaust and an Edelbrock performer RPM intake.

[rockhog]

The Comp 280H would be a pig down low with your 8.5 to 1 and small cubes.
Even the largest Comp 4x4 cam is too much with 226/234 at .050. The comp 268HE ground on a 108 lsa would work great and sound great with what you have. RPM band on the 268HE is 1500-5500. I used to run this cam in my old 355 powered CJ7 and it worked great doing everything. Here was the motors specs...

355 sbc
stock 76cc heads....3 angle valve job
Q- jet
Performer intake
Comp 268HE
1 5/8" long tube headers
2.5" dual exhaust....2 chamber flows
8.8 to 1 comp ratio

I had a NP435 with 4.56's and 35's. It worked well on the rocks/mud/sand/street. Tons of power all around.

[Odin K30]

Originally Posted by Tim84K10

Single pattern cams are old technology and outdated. Use a dual pattern camshaft, there is a reason that they were developed.

I am running an Xtreme Fuel Injection cam with about 218-225* of duration @ .050" in my 383. Mine is pn 12-365-4

I am using the same cam with my Vortec head 350 with TPI and love it. Low end is AWESOME. I would recommend going to the small side I have used 270 and 280 duration cams in my truck before, but like my current combo the best.

[Odin K30]

Originally Posted by rockhog

I run the comp 280H in my 454 powered Jeep. Its very lumpy and sounds nasty. What the comp ratio on your motor?? What gears?? If you want a nice little rumpy idle I would no doubt go with a Crane 274HO6 I thinks its call. It sounds as good as the 280H but has a much lower powerband. Its 218 at .050 but ground on a 106LSA. Trust me...you will love it.

Big blocks can deal with a larger cam better than small blocks.