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Old 03-27-2005, 05:23 AM
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best cam for double hump heads

Happy Easter folks,
I currently and running an xtreme energy comp cams with 501 507 lift and 112 lobe separation. I have non ported 461 heads with the 202 160 valves. I am using a victor jr as an intake. Obviously the heads do not work with the cam, my powerband is very short, and this is a 4X4 truck. I want to now attempt to install a new cam and intake that will take full advantage of the old hump heads. I have been thinking of an rpm air gap intake but am lost as far as cam choice. I want to have a noticable idle and I have a 2400 stall converter to play with. I mainly want power and torque to start from 1800 to 2000 rpm instead of 3000-3500 in my current situation. Any input would be greatly appreciated. Thanks, Sam

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Old 03-27-2005, 06:16 AM
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Need to know engine displacement, bore and stroke, automatic or standard, converter stall speed, gear ratio, compression ratio, vehicle weight, tire size, and intended usage just to name a few.
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Old 03-27-2005, 06:38 AM
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Its a 355, 350th trans. 83 4x4 pickup(don't know weight exacally but its heavy) Have flat top pistons and i think it has 373 gears. This will be a weekend driver that I intend to fully restore. Have a 2400-2600 stall. 31X10.5 tires.
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Old 03-27-2005, 06:43 AM
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For rock climbing the xe268 and for mud xe274, but i'm not a 4x4 guy and that's just a guesstimate.
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Old 03-27-2005, 07:28 AM
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I would stick with the plain old Edelbrock Perfromer intake.

The cam I would use would be a Lazer hydraulic grind. For more information go to www. lazercams.com


HYDRAULIC
Slightly choppy idle, mild performance use, highway driving some towing in 400 V8, 3.08-3.55 rear gear. Stock torque convertor OK in 305 and larger engine

1200-5600
2000-2400


2650116


265
265


215
215


.454
.454


110


106


.000
.000
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Old 03-27-2005, 09:09 AM
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I like the dyno sheet for the xe274 but I wonder what it would look like with my heads. Told lazer cams what I want and am waiting to hear back. Thanks for the tip.
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Old 03-27-2005, 10:00 AM
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Considering your heads, I would go with a split duration cam. 268xe comes to mind, maybe even step it down to a 262xe, but I'm concerned your compression maybe a little to high with that smaller cam and may have detonation. If you want something a little less aggressive to keep you out of detonation, consider a similarly spec'd cam from crane's new "Z" line or Lunati's "voodoo" line.

Do you know your compression, we can help more then. Im guessing its around 9.6 to over 10:1. Do you know what your quench distance is or have the heads been milled any?
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Old 03-27-2005, 10:29 AM
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The heads have just had the corrosion milled off the bottom and the block to head surface was milled for a nice mating but was not zero decked or anything. We figured over 9.0 but less than 9.5 but I am not abosutely sure what my comp. is. It does not detonate with the cam I have in it now on 93 pump gas(comp cam 12-250-3). The 268xe looks good and the 262xe makes a little more power than the 268. Will this cam still produce a noticable idle, 268 or 262
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Old 03-27-2005, 11:04 AM
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i am running the double hump heads, slightly ported and polished with an rpm air gap intake and the xe274 cam. noticable lumpy idle but not too bad...combination works very well and power comes on around 2500 rpm and pulls hard well past 6000. would recommend the combination to anyone...you will be happy.

steve
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Old 03-27-2005, 11:10 AM
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What stall speed do you have.
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Old 03-27-2005, 11:31 AM
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Sam, keep in mind that you have a very heavy Blazer. You will need a cam with less duration than guys running light weight vehicles. You will need more low speed power than what would be required in a smaller car or truck.

Actually, an ideal cam would probably not really lope at all, but since you want a little rumble to it, you could maybe cheat just a hair, but not much.
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Old 03-27-2005, 11:38 AM
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NAIRB,
Do you think the xe262 or xe268 would be a better choice. Probably will be Mon before I hear from lazer cams.
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Old 03-27-2005, 11:48 AM
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Any of them would be a decent choice. I use Lazer cams because of the personal service I get from them. You get to talk to the owner of the company, not some schmuck. His cam grinds offer the latest fast acting ramps that make modern cam profiles work so well.

Don't get me wrong, the Comp stuff works well, but I prefer to pay my extra money for the service I get with Lazer. With Comp, you are paying a premium for advertising.
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Old 03-27-2005, 11:58 AM
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I hear what you're saying. I'll see what they have to say come Monday. Thanks for all the help.
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