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Old 04-19-2006, 06:07 PM
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Comp Cam 286HR

Would a Comp Cam 286HR be too big for a 1957 Chevy Truck that will be driven on the street? The Comp Cam will paired up with Iron Eagle Platinum heads with 200cc, Comp Cams Magnum 1.5 rockers, TCI 400 super street fighter transmission, Eagle 3.75 forged crankshaft, Eagle 5.7 forged H beam rods, and Speed Pro forged pistons. Also, what carburetor would be good for this set up and what kind of horsepower should I expect to make?

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Old 04-19-2006, 06:47 PM
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you did not give the engine size
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Old 04-19-2006, 08:26 PM
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Comp Cams 286HR

The engine is a Chevy 383 small block.
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Old 04-19-2006, 09:18 PM
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Too big?

Well, no, not if you are prepared to run 10.0 to 11.5 compression ratio, install shorter gears and a 3,000+ converter and put up with very little manifold vacuum. Power brakes will need an accumulator or electric vacuum pump.

If you haven't ordered the cam yet, you may be interested to know that you can order a reduced base circle cam to help with con rod clearance, but you'll have to use longer pushrods to compensate.

Oh, I almost forgot. With a lift of 0.560", you should leave some time in your schedule to change valve springs on a regular basis unless technology has caught up with fatigue.
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Old 04-20-2006, 05:18 AM
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I run the XR282 with 1.6 rockers in my 408. It runs just fine on the street with a mild choppy idle and I get 14.5" inches vacuum with low drag 1/16" rings. I also got mine in a reduced base circle which cost me right under $300 2 years ago and I used 7.5" pushrods to get correct geometry. The 383 cubic size will absorb some of the duration and lift as most all cam companies spec their cams for 350's. If worried about vacuum, run a set of gapless rings to help bring up the vacuum. I'd run a 2500 stall and minimum a 750cfm carb.
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Old 04-20-2006, 09:26 AM
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valve springs

I hate to break it to the first guy to reply,but valve spring technology has caught up plenty.You can now buy exotic metal valve springs(not titanium) that can withstand many more wear cycles than available just two years ago.Crane and Comp Cams have two such examples in their catalogs right now.Go for it and enjoy the results.
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Old 04-20-2006, 02:06 PM
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not even close to over kill.it will be right at home.
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Old 04-21-2006, 03:12 AM
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Comp Cam 286HR

Thank you all for the information. I will be building my Chevy 383 and have decided on a 750 Holley for the set up.
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Old 04-21-2006, 01:09 PM
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You might be interested to know that the booster configuration plays a big part in idle and part-throttle driving characteristics,such as dog-leg boosters or annular discharge.I'd go that route if I wasn't going to use EFI.
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Old 04-21-2006, 03:33 PM
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Just for the record, I have this same cam (comp 286h) in my 383 with 10.9:1 CR. It has sportsman II heads, and a holley 750. This is in an '86 chevy pickup short bed, with 2500 stall and a 3.73 gear. It runs really strong above 2500 all the way to about 6000. I'm very happy with the cam. (Sounds great also)

Jeremy

uhhooooo I just noticed that yours is a roller. Sorry... mine is hydrolic. You'll still be in good shape, and with no worries b/c it's a roller


Jeremy
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