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Hi,
I want to change some parts on the Challenger's 440 engine so it will look more stock. Already have HP-manifolds and a stock iron intake lying around. Need help on choosing the right cam.
440 0.030 over
9.7:1 CR (measured)
2500-2800 stall converter
3.23 gears
want a hydr cam which gives streetable power from around 2000 to 5500
As I currently have a 20years old design solid cam I already have Isky 1.5:1 rockers.
Carb is a Holley 800DP which may stay if it works.
Heads are MP Stage 5 iron from the late 80s. Ported with 2.14 and 1.81 valves.
2.5" exhaust system, TTI, still to be bought

Basically my goal is a stock looking engine with HP-manifolds that can perform a bit better than stock. Don't want a F.A.S.T. car, no extrude hone or such. Want to run the stock dual snorkel air cleaner. Intake might be changed to aftermarket dual plane if it helps.

I read about the Comp cams XE275HL. Will that cam be too much for stock intake and exhaust? Should I rather go with standard lift? Whats the rpm where the HP manifolds will considerably cut power off?

Thanks
Jens

IMO the Lunati 60304 would be another choice for a camshaft.The Comp will have a bit more power above 5000 but the Lunati will have a bit more torque thruout the range and nearly the same h.p.Either cam will work very well.

I would also recommend the Edelbrock Performer RPM over the stock int.Big improvement.800 DP is a fine choice.

The 3 inch exh system will be helpful with the stock manifolds and minimize the lack of headers.

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Have Dwayne Porter or Bob K. custom grind you something special for your exhaust manifold engine.

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One of the better choices in camshafts. Excellent
call!!!

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I would have one of the professionals recommend a custom ground cam. I am guessing something with a wider LSA, and maybe extra exhaust duration if you are running stock exhaust manifolds.
Just look at the unusual specs of the stock 440 HP cam:
268/284 duration, 115 LSA, installed at 113 intake CL. Timing Events:
IO=21
IC=67
EO=79
EC=25
Overlap=46

This profile allows the exhaust to open really early to reduce pumping losses, while minimizing overlap that could cause reversion into the intake to get that smooth idle quality.

The XE275HL cam is a good cam (nice fast lobe profile), but really is setup more for use with headers. This cam is 275/287 duration, 110 LSA installed at 106 degrees:
cam timing:
IO=31.5
IC=63.5
EO=77.5
EC=29.5
Overlap=61

Looking at the timing specs, the stock cam actually opens the exhaust valve sooner that the comp cam does, and the comp cam (with more duration) closes the intake valve sooner than the stock valve, so most of the extra duration is in the overlap period of 61 degrees vs. 46 degrees.

my (about what its worth), might be ordering the XE275HL cam on a 112 or 113 LSA, and install it at about 108-110 degrees?
Example of the XE275HL cam with 112 and 113 LSA installed at 108 and 110 intake CL.:
Duration is still 275/287
112/108 ----- 113/110
IO=29.5 ----- IO=27.5
IC=65.5 ----- IO=67.5
EO=79.5 ----- EO=79.5
EC=27.5 ----- EC=27.5
Overlap=57 -- 55

I like the look of the 112/108?

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Makes sense to me!!! That 112-110 range
of centerline and lower overlap, can really
compliment a good dual plane manifold. Better
response and wider powerband.

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This article has more cam testing that I did with that engine.

http://www.compcams.com/Community/Articles/Details.asp?ID=-1849542054

(all of these articles are in the tech archives on this board)

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