302 cam swap
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Junior User
Joined: Jul 2007
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From: Clearfield Pennsylvania
302 cam swap
I have a 92 302 that I want to change cams in. I was looking at one with an advertised 250 duration and .466 lift. The ad says this would widen the curve to idle-5000, but im not sure if i trust it. Would this be a good cam for low end torque? Primarily what Im trying to do is lower the powerband of the motor, so I dont have to scream it as much
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Joined: Nov 2006
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probly not going to find a cam with a lower power band than the stock cam. but any after market cam that will work with your computer system will most likely make more power in the same rpm range as the stock cam. what gearing are you running?
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Your '92 has SD efi so you are limited in what cams you can use, if the one your are looking at doesn't specifically say it's EFI friendly it probably won't work well in your motor.
How is your truck equipped right now.. tire size.. gear ratio?
Is the exhaust all stock?
Would you be willing to change the intake?
How is your truck equipped right now.. tire size.. gear ratio?
Is the exhaust all stock?
Would you be willing to change the intake?
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Junior User
Joined: Jul 2007
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From: Clearfield Pennsylvania
My truck has 3.55 gears and 31 inch mudders. If I cant lower the powerband I probably wont get a new cam at all because I dont like to scream the motor. Maybe a better idea would be a 460 swap haha???
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Junior User
Joined: Jul 2007
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From: Clearfield Pennsylvania
I just looked at the advertisement again the cam I am looking at is a Lunati Voodoo and a line from the ad reads as follows:
"The Voodoo series covers more applications (normally aspirated, fuel injection, RV/towing, marine, 4X4 off road, street rod, muscle car, touring, fuel economy) than any other cam series offered today."
It sounds to me like it would be compatible, right?
"The Voodoo series covers more applications (normally aspirated, fuel injection, RV/towing, marine, 4X4 off road, street rod, muscle car, touring, fuel economy) than any other cam series offered today."
It sounds to me like it would be compatible, right?
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Joined: Nov 2006
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that sounds like a description of the line of voodoo cams as a whole. you are very limited with what size cam you can use with SD. try looking for a cam with a LSA of 114 degs or more, and a intake and exhaust duration ( measured at .050 ) with less than .210. before doing a cam swap though you should look into simple bolt ons that will help out the stock mill. or swap the 460!! that would be cool! expensive tho!
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
The 302 won't ever be a torque monster but you can be improved quite a bit from stock. Look for an F4TE roller cam from a later motor and add 1.7 rockers. Bolt on a HO intake with a 1" spacer and add longtubes and a 2.5" single exhaust.
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Junior User
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From: Clearfield Pennsylvania
Ok I looked at the Lunati website as opposed to Jegs and it gave me all the specs. Its duration at .050 is 207/213 the lift is .466/.483 and the LSA is 112. With this info can you tell if it will work or screw up my truck haha. So Conanski are you saying not to bother with a cam at all?
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FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
That's a decent cam for your application but it's a flat tappet so you'll have to buy lifters and longer pushrods to convert your motor since it will have a roller cam in it right now.
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1) Anything you do to an engine of a given size raises the peak power RPM.
2) If you do nothing to an engine other than make it larger, it lowers the peak power RPM.
Note the word "general", so it is possible to improve the power band with a clever cam profile.
How old is this engine? Beware the false economy of opening up a tired engine and not doing a complete overhaul. Your performance gains will be short lived with worn rings and bearings.
The way to more grunt at low revs is displacement. Even a 331 stroker set up along with the cam, better compression and fresh parts will be an eye opener, for a lot less than the 460 swap. My guess is your existing efi will work ok with it as well. jmo, ymmv.
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From: Southern California
1. I would call Iskenderian
2. There are some "tricks" that can be used to shift the power band higher/lower by up to 500 rpm by advancing/retarding the cam timing- with the new mod engines. definitely talk to the cam grinder as they can help make this happen for you!
2. There are some "tricks" that can be used to shift the power band higher/lower by up to 500 rpm by advancing/retarding the cam timing- with the new mod engines. definitely talk to the cam grinder as they can help make this happen for you!
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Junior User
Joined: Jul 2007
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From: Clearfield Pennsylvania
Thanks for the help guys. The engine is a 92 and has a hundred thousand miles, and it runs strong in its powerband, Im not too worried about it needing a rebuild yet, although I wont be stubborn when the time comes. I was planning to stroke the motor to 347 eventually, but its looking a little expensive right now.
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