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Good truck cam?
#2357956
08/22/17 01:52 AM
08/22/17 01:52 AM
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Joined: Aug 2015
Posts: 84 Wisconsin USA
themoparmanjc
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Posts: 84
Wisconsin USA
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I just bought a NOS mopar direct connection purple shaft cam and lifter set from a friend for cheap. I am concerned with the duration being too high and sacrificing low end torque. First off, it's going in a .040 over 360 with slightly more compression than stock. This motor is going in my W350 which has an automatic and 4.10 gears. The part number is P4286671. The duration is 272. The overlap is 48. Lift is .455"/.455". Recommended installation centerline is 108. What can I expect out of this cam?
Don’t Buy From Famous Bob AKA Bob McCarty in Oklahoma. He is a Crook!
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Re: Good truck cam?
[Re: themoparmanjc]
#2358429
08/23/17 01:32 AM
08/23/17 01:32 AM
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Joined: May 2015
Posts: 259 n.c.
geo.
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n.c.
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I've got that cam in my '85 d350 four door, 360, stock compression, stock intake, headers, duals, automatic, same gear. Rough idle, poor low end, great at highway speeds. So I guess I'd recommend a milder grind, or more compression, or try advancing it. I degreed mine and set it to whatever the cam card suggested. I guess it's been in the truck since '98, keep thinking I'm gonna change it one day!
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Re: Good truck cam?
[Re: themoparmanjc]
#2358508
08/23/17 11:50 AM
08/23/17 11:50 AM
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Joined: Aug 2015
Posts: 84 Wisconsin USA
themoparmanjc
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Posts: 84
Wisconsin USA
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Thanks for the input guys. I think I will sell this one and get something with lower duration.
Don’t Buy From Famous Bob AKA Bob McCarty in Oklahoma. He is a Crook!
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Re: Good truck cam?
[Re: mgoblue9798]
#2358738
08/23/17 08:08 PM
08/23/17 08:08 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
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I Live Here
Joined: Jan 2003
Posts: 16,376
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228 intake duration at 50 lift? No way is this a truck cam. It's the predecessor to the 761 cam that Mopar Performance used a thousand years ago to make around 400 hp with a 318 with their ported 302 heads. The 757 cam is much easier to live with.
I think I'd look at Lunati's smallest or second smallest Voodoo or a Hughes with around 208 intake duration at 50.
The really sick part is that when this camshaft was being sold, Direct Connection/Mopar Performance refused to publish any figures for duration at 50 lift. Reading the engine manual at the time it sounded like they thought the public was too stupid to use the information properly. Their suggestion was to pick the cam by the lift, and they'd tell us what lift to use to get what results. There was a series of recipes in the old engine books, for example, how to build a 13.50 machine, something like that.
R.
Last edited by dogdays; 08/23/17 08:36 PM.
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Re: Good truck cam?
[Re: themoparmanjc]
#2367253
09/07/17 11:44 PM
09/07/17 11:44 PM
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Joined: Aug 2015
Posts: 84 Wisconsin USA
themoparmanjc
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Wisconsin USA
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The cam selection is no longer a problem. I found a complete running Cummins 4x4 5 speed truck for 1000 bucks that will be my new parts truck. Thanks for the input everyone.
Don’t Buy From Famous Bob AKA Bob McCarty in Oklahoma. He is a Crook!
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