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Old 03-05-2006, 08:43 PM
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should I go with a roller cam

My question is about choosing a camshaft for my 383 stroker motor I am building.The motor is not built yet,and I used a desktop dyno,and the roller cam I was looking at made 542 horses & 453 ft lbs of torque @6500 rpm.The roller cam I was thinking about buying is a lunati with 290 Adv. duration and 555/555 lift intake and exhaust rpm range is 3000-6600 here is the part number 638-50157 jegs.The cam I was originally going to use was a comp magnum 305 with 525" lift flat tappet.I'm going to race,and drive on the street some.Is the roller worth it ?I want to get my 70 camaro to be in the 11s,and anyone can help please post,and tell what kinda mods should I make,or should I stick with the comp cam? I can give all the engine specs if needed.The compression ratio is 11:1 with a 6" rod. thanks

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Old 03-10-2006, 12:14 AM
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Not for a street car and not for some of the race cars either.A roller is fine for 7500-8000 or more rpms for reliablility and quick ramp rates,but isnt necessary. Look at all the flat tappet factory cams that were around. That 305 cam is a nice street cam,but really isnt the deal for racing. Look for a flat around 250 -260@.050 for marginal street and if the heads are decent,.550 to .600 lift on a 108 lobe seperation. Use a edge orifice lifter and 135 seat pressure and around 400 open. roller will have to have 250 seat and 650 -750 open pressure like a K950 1.550 dia or K-1000H 1.625 dia and roller lifters which dont hold up very well on the street and stout pushrods and crane rockers with 7/16 studs,etc,etc. Dont skimp on the valve train if youdont want to pick up pieces. check everything.Still need more specs tho.
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