Choosing a solid roller Cam

guru

Well-known member
Joined
Mar 25, 2008
Messages
393
So here is my criteria:
355ci motor
6" rods
10.27:1 compression
Comfortable at street driven RPMs (1000-3000)
Racing RPM range 4500-7000
Shifting 6800 RPM
Easy on Parts
With the AFR heads and their good exhaust port, I am all about a single pattern cam.

If easy on parts translates into lift under .55 I will use AFR 180 heads. If easy on parts translates into lift around .6 I will use AFR 195 heads.
I am unsure on the appropriate intake manifold, a weiand stealth (Dual plane) or Team G (single plane).

Thoughts?

Cammotion has a 270 at .02 lobe, 238 at .05 and .325 lift
This will make a nice mild .52 lift with 1.6 ratio

Lunati offers a 278 at .02, and 242 at .05, and 158 at .2, and .371 lobe lift
This would make a nice .594 lift with a 1.6 ratio rocker ratio

Compcams has a 274 adv, and 236 at .05 and .376 lobe lift
This would make a nice .602 lift with a 1.6 rocker ratio

Crane cams has a 278 at .02 and 228 at .05 and .338 lobe lift
This would make a nice .541 lift with a 1.6 rocker ratio
 
It's sooo easy to overcam an engine. With your 10.2:1 CR I'd be looking at the Comp HR (I think 282) with 230-236 duration ground on 112LS... lift is .510/.520 with 1.5 rockers... with an automatic trans I'd consider even this one too hot for a 350 or 355.... it will allow shifting at 6800 though.....

What are you going to do with this engine ? Race only or street use ??

I have this cam (above) in my 383 and the engine does not like to cruise at 1500 or even 1700 rpm....

If you don't bump your CR to at least 11:1 I don't see why you would need a solid roller cam....
 
If you don't worry about valve train wear or counteract it with a shaft rocker setup, you could make the cam more radical and still have one that is streetable with good vacuum. All you do is use smaller mayor intensity numbers. Maybe this would mean buying a custom cam. At least that is what i did.
 
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