460 cam help
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Cross-Country
Joined: Dec 2003
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460 cam help
I bought a 76 f250 with a 460. It's got dove heads and a 71 block. I have done everything I know to try to get the truck to run smoothly and it just ain't working. I think it was a pulling truck before I got it. It runs great at higher rpm. Fastest I've ever gone in a dent side. Truck actually kinda scared me. It's got a Holley double pumper edelbrock performer manifold. Mallory ignition. Hooker headers. Comp roller tip rockers. I have no idea what kinda cam is in it now. It pulls around 7 lbs of vacuum at a idle. It is very fast but doesn't go down the road very easily. Seems like it wants to run at a full throttle but doesn't like cruising at 2000 rpm. I need a more street able cam that still makes good power. I have had cams in car and really like that lob lob lob. But it's gotta be driveable. Any ideas what cam I need
Elder User
Joined: May 2015
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It depends what you're going to be doing with it. Different cams will adjust your powerband higher or lower in the RPM range.
I'm in the process of selecting a cam for my 460 right now, and I think I've settled on a "mid-range" cam with a suggested ideal RPM range of 1800-5800. I want the low end grunt more than the race-ability of top end power, but the "low range" cam seems like it might be a little too much of a dog in the mid range. It was rated for 1400-5400 RPM.
You'll just have to decide what it is you're wanting to do with it. That will dictate what type of cam you want.
I'm in the process of selecting a cam for my 460 right now, and I think I've settled on a "mid-range" cam with a suggested ideal RPM range of 1800-5800. I want the low end grunt more than the race-ability of top end power, but the "low range" cam seems like it might be a little too much of a dog in the mid range. It was rated for 1400-5400 RPM.
You'll just have to decide what it is you're wanting to do with it. That will dictate what type of cam you want.
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
No one is driving their 460 truck at 5800 rpm on the street.
Find a cam for 5k at most.
... and lose the double pumper.
You want a vacuum secondary carb with a medium to heavy spring.
Once you get a cam that actually has some vacuum at idle, the progressive nature of a vacuum secondary carb will make it much easier to drive and help with mileage.
Find a cam for 5k at most.
... and lose the double pumper.
You want a vacuum secondary carb with a medium to heavy spring.
Once you get a cam that actually has some vacuum at idle, the progressive nature of a vacuum secondary carb will make it much easier to drive and help with mileage.
Lead Driver
Joined: Mar 2004
Posts: 8,924
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I bought a 76 f250 with a 460. It's got dove heads and a 71 block. I have done everything I know to try to get the truck to run smoothly and it just ain't working. I think it was a pulling truck before I got it. It runs great at higher rpm. Fastest I've ever gone in a dent side. Truck actually kinda scared me. It's got a Holley double pumper edelbrock performer manifold. Mallory ignition. Hooker headers. Comp roller tip rockers. I have no idea what kinda cam is in it now. It pulls around 7 lbs of vacuum at a idle. It is very fast but doesn't go down the road very easily. Seems like it wants to run at a full throttle but doesn't like cruising at 2000 rpm. I need a more street able cam that still makes good power. I have had cams in car and really like that lob lob lob. But it's gotta be driveable. Any ideas what cam I need
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Cross-Country
Joined: Dec 2003
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Too cold to work on it here, so I guess it sits till spring. I am gonna do bring t to a garage and see if they got any ideas. I don't know a lot about motor rebuilds, so maybe a shop that does high performance engines for a living can help me.
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New User
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Assuming all else is healthy, when going "backwards" into picking a cam, best to know compression ratio first. If it's 11:1, you have to cam differently than if it were 9.5:1 or whatever it is.
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From: In my house..
I bought a 76 f250 with a 460. It's got dove heads and a 71 block .. I have done everything I know to try to get the truck to run smoothly and it just ain't working .. It's got a Holley double pumper .. Seems like it wants to run at a full throttle but doesn't like cruising at 2000 rpm.
https://www.demoncarbs.com/1900.asp#2
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Joined: Apr 2006
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A coarse chek on lift can be done by removing valve cover and measure spring height with valve closed and measue again with vale open. Check compression helps to know mechanical some mechanical conditions. I run ported DOVE heads on a 86 short block. Best cam would be with ported DOVEs would be .535 int and .450ish exh assuming you have enough valve clearance. I dont have the clearance with stock pistons so went with a .515 int and .525 exh. Compression is a bit high at a bit less than 10.5 as an educated guess. Pulls about 18" vacuum at idle. Useing a HR 780 VS Quick Fuel and modified original Torker. Intake is a bit restrictive its much quicker with a Torker II. Have run with both intakes. Not positve as to which intake is best for towing. The Torqer II actuall pulls away in 4 th gear rolling at idle rpm a bit more smoothly than the Original version. Going to swap back to the II in the near future for a compairison after running the original for ove a year now.
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