Cam selection
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Senior User
Joined: May 2010
Posts: 223
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From: Florida
Cam selection
74 390, would a cam with 514 lift on intake and exhaust, with 223 duration at 50 be ok to use? Truck has power brakes and vacum operated AC controls. I have never understood these numbers, i just want it to have a lope at idle. Thank you.
Freshman User
Joined: Nov 2010
Posts: 40
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From: northwest PA
Hey, I used one of comp cams extreme energy cams in a 390 i built. Comp called it XE262H, it was a great running cam with a noticeable idle (but not real rough). The lift was .513 on the intake and .520 on the exhaust (to compensate for smaller exhaust valve). The duration @ .050" was 218 intake, and .224 exhaust. If you go to comp cams web site and select the fe engines (don't worry about the grind), they have a decription of how the cams run and idle. I reccomend checking it out, Great web site!
Certified Thread Hijacker
Joined: Aug 2001
Posts: 14,441
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I would consider that cam about a step and a half over stock. It will wake the engine up a little, the lobe seperation angle will give an idea of what kind of idle to expect. Especially with those small duration numbers. Lift doesn't matter.
109-110 is choppy
111-112 is moderate
113-115 is mild
Josh
109-110 is choppy
111-112 is moderate
113-115 is mild
Josh
Freshman User
Joined: Nov 2010
Posts: 40
Likes: 0
From: northwest PA
Hey, I used one of comp cams extreme energy cams in a 390 i built. Comp called it XE262H, it was a great running cam with a noticeable idle (but not real rough). The lift was .513 on the intake and .520 on the exhaust (to compensate for smaller exhaust valve). The duration @ .050" was 218 intake, and .224 exhaust. If you go to comp cams web site and select the fe engines (don't worry about the grind), they have a decription of how the cams run and idle. I reccomend checking it out, Great web site!
