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Old 06-29-2008, 07:01 AM
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CAM swap - Let me know what you would run!

So, currrently Im running a COMP Magnum 280H

Here are my specs otherwise:

Chevy 350 4 bolt
Stock Crank
0.40" over Keith Black pistons 9.77:1
Stage 1 Rods
World Products Sportsman II Heads
2.02/1.60 Manley Swirl Valves
Comp Lifters/Guides/Pushrods
Comp Roller Rocker Arms 1.5:1
Weiand Stealth Intake
AED Custom Holley 750 DP
Holley Red Elec Fuel Pump
MSD ProBillet Dist., 6AL and Blaster 2 Coil
Taylor 8mm Wires
Hooker Headers and Dual 3" 40 Series Flowmasters

Engine is in a K20 Pickup with 10" Lift and 38" Tires
SM465 4spd Tranny and NP205 Tcase

*Using the truck for fun mudding and competitive Sled Pulling

Please give your thoughts on a New Cam for my setup!

Requirements:
Nasty at Idle
Strong through approx 6200rpm
Still enough vacuum to use my brakes
I want to stick to Comp Cam
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Old 06-29-2008, 09:12 AM
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The one you have is just fine. If you want to pick up a little power you could try the mechanical roller version of the same camshaft. be sure to use the correct springs, if you decide to try a roller cam.



Larry
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Old 06-29-2008, 09:37 AM
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Im not sure what the specs for that cam are, but as per your requirements, any cam that is "nasty at idle" is going to hurt you on those sled pulls unless you have an equally nasty compression ratio.

Bottom end torque is the ticket for a sled pull.

Looks like youve otherwise got the makins of a hellacious 350 though..
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Old 06-29-2008, 11:04 AM
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First you need to decide how much money you are ready to spend.
You are NOT looking at a simple cam swap, IMO.

Duration wise I think you are about right at 230 single pattern. You need all the lift you can get. I would tighten the lobe separation angle 2*. I would time the cam for about 4* advance ILC.

A custom grind & nitrided hydraulic flat tappet cam, new oil-hole lifters, new bee-hive valve springs, new push rods, and new high ratio roller rocker arms.... $1400.

If you have money, I suggest moving up to a solid roller cam. Probably $1700+ total.

I don't know much about your rpm range, except you say 6200 max, and then I would guess it pulls down to 4500 under the last few feet.

If you can't spend much, I would go to high ratio roller rocker arms and new push rods and beehive springs,

and dump the Flowmaster mufflers and see how much better it runs without them. I have never had any good luck with them at all.
I would do exhaust tuning with a collector extension and expansion chamber.

This is time for serious consultation with Competition Cams.

Last edited by ScoTFrenzel; 06-29-2008 at 11:13 AM.
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Old 06-29-2008, 11:27 AM
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Quote:
dump the Flowmaster mufflers and see how much better it runs without them. I have never had any good luck with them at all...
...This is time for serious consultation with...
Have to agree with the flowmasters. As far as your cam goes, CC, or any competent cam grinder would be happy to hook you up. If you don't want roller, have you even considered a solid flat?
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Old 06-29-2008, 12:49 PM
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Quote:
Originally Posted by Stroke
Have to agree with the flowmasters.
They are popular, and are the IN THING. The Flowmaster sound is a personal choice.

Rodders are desirous of every horsepower.
All I am saying is try without them, and tune the exhaust.
Then find a muffler that doesn't choke the engine.
(I had one personal car that adding tailpipes knocked it in the head.)
I have found other mufflers to make more power on a street exhaust system.
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Old 06-29-2008, 12:54 PM
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The problem I got now is I wiped a lobe on my current cam, so since I have to replace it anyway - I wanted to see if jumping up to the 286H or maybe the 292H would be a good change up. I think for this engine, Im going to stay with a hyd cam for an "easy" $200 fix. I want to keep it COTS, no custom grind needed.

I have Flowmasters b/c my truck is street legal. I runs much better without no doubt, but this a weekend warrior.

What about a 4/7 swap Xtreme Energy cam - what are the benefits there??

I think I want to get the CMP-12-213-3... 292H - 244 @ .050, .501" lift intake and exhaust
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Old 06-29-2008, 01:00 PM
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Quote:
Originally Posted by ScoTFrenzel
First you need to decide how much money you are ready to spend.
You are NOT looking at a simple cam swap, IMO.

If you can't spend much, I would go to high ratio roller rocker arms and new push rods and beehive springs,
I need to go higher than 1.5:1? I already have some of the biggest push rods available for this application. I don't know if I need beehive springs...
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Old 06-29-2008, 01:06 PM
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Quote:
Originally Posted by ORANGEGASM
The problem I got now is I wiped a lobe on my current cam, so since I have to replace it anyway
Since you wiped a lobe on the cam you will need more than just a cam swap. A complete tear down and cleaning is in order because of particles in the engine from the wiped out lobe. Think about crank and rod bearings as well.

Quote:
Originally Posted by ORANGEGASM
I think I want to get the CMP-12-213-3... 292H - 244 @ .050, .501" lift intake and exhaust
This is a good cam and is worth considering.
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Old 06-29-2008, 02:05 PM
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I want to stick to Comp Cam

You really need to expand the limits of your world.

Isky 284/292-6 Hyd Megacam

Install on 102 intake C/L
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Old 06-29-2008, 04:40 PM
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Quote:
Originally Posted by Frisco
Since you wiped a lobe on the cam you will need more than just a cam swap. A complete tear down and cleaning is in order because of particles in the engine from the wiped out lobe. Think about crank and rod bearings as well.

This is a good cam and is worth considering.

Im going to pull the engine and look at the mains and rod bearings.

Im trying hard to find a 400 sbc. but if I dont in time, I will just drop in a new cam. I had this engine since stock, and it wiped a lobe stock. So, im scared it may be the block that isnt oiling the cam on one lobe properly.

I like the profile of the 292H. Have you had experience with it?

Quote:
Originally Posted by F-BIRD'88
I want to stick to Comp Cam

You really need to expand the limits of your world.

Isky 284/292-6 Hyd Megacam

Install on 102 intake C/L
I have never heard of this company... I will check into them. I'm impressed with COMPs lineup and products, so thats why I wanted to stay with them. I have had 10 years of abuse on this engine. I guess I dont owe it anything!

As far as profile, do you think the 292H will be a good choice too? Its close the ISKY cam you showed me. Also, are prices higher at ISKY?
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Old 06-29-2008, 05:01 PM
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You have never heard of Iskenderian Cams?

Um was the trip to earth long and tiring. Cause you must have just arrived on planet Earth. Welcome...

Ed iskenderian (Isky cams) and Harvey Crane (Crane Cams) are the pioneers of modern high performance racing cams and valve trains.
Between the two of them they have probabily forgotten more about racing cam design and manufacturing than any other cam company will ever know.
Essentually most all of the popular cam grinders and cam designers today, got their start, worked for and were breast/bottle fed and weened from one or the other of these guys.
They and their cams and computer generated cam lobes are the standard by which all the others like Comp Cams and Lunati etc etc etc etc etc etc are compared.
Funny you never see a direct A -B dyno test comparing Brand C against a comparable Isky cam.

I find their stuff to be of superior design.

www.iskycams.com

Google search "Ed Iskenderian" "The Camfather"

The CamFather

www.cranecams.com

http://harveycrane.com/ required reading, there will be a test.

Last edited by F-BIRD'88; 06-29-2008 at 05:17 PM.
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Old 06-29-2008, 05:06 PM
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Quote:
Originally Posted by ORANGEGASM
I have never heard of this company... I will check into them.
Iskenderian Cams have been around for many many years. I'm surprised you have not heard of them. They are among the best available. Go to Isky Cams to read a little of the history.

Whichever brand of cam you choose; it is my opinion to purchase a matched set of components from the same manufacturer for the best results as they will have been engineered to work as a unit. i.e. cam, springs, etc.
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Old 06-30-2008, 07:42 AM
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Greetings Earthlings

haha.


Alright Alright, I must be living under a rock. But, in my defense - I haven't dealt with building an engine in 10 years, and when I built this one I was only just learning to drive! So, I think I did OK.

I bought an 05 Cummins 3 years ago, and have spent alot of my time learning about diesel performance, and not alot of what was out there for American Muscle.

I will read up on Isky. BUT, I do not want to change the entire valve train just to run their cam! If i can get away with Cam and Lifter swap, Im down for giving them a shot, but otherwise - I cant see $2000+ upgrades to run Camfathers illegitimate child!

I'd rather spend $200 and get back running, and dump the other 1800 or so into a south bend double disk clutch...
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