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Cam question?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by richardc, Aug 7, 2000.

  1. richardc

    richardc Registered Member

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    I've got comp cams PART # 12-239-3 lift is Int .462 Ex. 480. DURATION AT .050 is intake 218, ex 226. Lope seperation 111 deg. My machinist claims it will be too radical and lope alot. This I don't want in a street/trail K5. What I was wondering was has anyone used this cam? Do you think it's too much? It will go in a 383, 9.5 comp, headers, performer intake. I have an automatic and run 4.10s with 33x12.5 BFGMT. Cam selection has always seemed a black art to me. I've also considered compcams 268H. What do you think?
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Well from what I see on the specs you provided, I don't think it will be that lumpy at all, especially with th 111 degree L.S.A.. That kind of L.S.A. is designed to minimize the bad idle characteristics of a long duration cam, as well as provide a crisp throtle response. Chevy LT-1's run a very hot cam but still idle nice (the new LT-1's) this is achieved by running a 117 degree L.S.A.
    The lift specs look fairly mild. I'm using the comp cams 260H in my Jimmy. 355, 9;1, headers etc and it idles very smooth. A 383 is going to need more cam anyways. Have you ever checked out the specs on a mild big block cam?
    Its just my opinion but I think the cam you've got will work just fine. If you're still not sure give Comp Cams a call, their tech guys are awesome.

    Rene 81 Jimmy,350,SM465,FF14 bolt,HD Dana 44,3.73's,4"susp.,35"Grabber MT's,body in progress
     
  3. Cam sounds pretty good to me!!Check out Comp's new exstreme
    4X4 cams,they are designed for 4X4 to make the best power where you need it most and keep vacume.As for the mechanic
    dont sound like he knows alot about cam tech.Call comp cams
    directly and they can help you out,sorry dont know the number.I think they there web site is {www.compcams.com}\


    IF IT AINT BIG IT AINT BAD!!!!!!
     
  4. blazer72

    blazer72 1/2 ton status

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    Cams are funning thing I have tryed a few in my blazer. Most of the hypro one were ment for much liter cars not are 6000 lbs toys. I used the run the comp cam 268 or 270 hydro cams with no lope and thogh it was the best, then I went to a Melling stock replacement 370 hp cam for the late 70s vett, I hated it! I just went the the big comp cams 4X4 cam, the bigges on they have for a SB with hydro lifters. Work great sure it dies out above 4200 rpm, but the tork starts at 1000 and builds to 2200, but it only drops 5 by the time it gets to 3000. And it stay strong to 4000. My motor is stronger than most but I run after market TPI which is realy a folded tunnelram.

    268@1000
    513@2200
    509@3100
    390@4000
    330@4500

    4500 is the self imposed redline. 400 do not like running much over that poin and with the numbers fally off like they do I dont see any reson to go over 3500 most of the time.

    I understand the jeep thing I drive a BLAZER!!

    Ken
     

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