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cam and intake question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Liberator, Dec 16, 2001.

  1. Liberator

    Liberator 1/2 ton status

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    I found a GM Goodwrench 350 crate motor for my Blazer. The engine has about 80,000 miles on it. I spent a few hours today getting it ready to put in my truck but thought I'd do a few things before putting it in. I don't really want to use the stock intake/cam setup and was wondering if anyone knows the best combination for the motor. I was initially thinking going with a Performer intake and a Comp Cams Extreme 4x4 cam. Would this be a good combination? Does anyone else have any suggestions keeping the cost factor in mind?
    As far as I know, the engine is totally stock. I'll be running the stock Quadra Jet carb.

    Thanks in advance!

    Bo

    If it breaks, it wasn't good enough!
    http://coloradok5.com/gallery/liberator
     
  2. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    OK, using the cam with the 206/214 duration and the edelbrock manifold will give you.... 232hp at 4,000 rpm and 321 lb/ft tq at 3,200 rpm. This is also using your stock manifold and 2.5" dual exhaust with no cats.

    At least this is what engine analyzer says.

    <a target="_blank" href=http://new.wavlist.com/movies/031/ag-blow.wav>"I ain't nobody, dork."</a>
     
  3. Liberator

    Liberator 1/2 ton status

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    Wow! That's outstanding! Can you do another calculation! How about using the 218/226 duration, .462/.480 lift, 262 grind? I need to get that program you have!

    Bo

    If it breaks, it wasn't good enough!
    http://coloradok5.com/gallery/liberator
     
  4. Bigmeats

    Bigmeats 1/2 ton status

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    The comp cam is around 169.00 and the edelbrock Performer cam to match the intake is 109.00 Just checked the prices last week at a local shop, they are very close to summit prices

    Bigmeats.....Manhattan Il

    1975 Blazer
     
  5. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Well, at 3,650 rpm, its pushing 314 lb/ft of tq. Its hits the 300s at 3,000 rpm and falls out at 4,300. At 4,250 rpm, its pushing 244 hp.

    <a target="_blank" href=http://new.wavlist.com/movies/031/ag-blow.wav>"I ain't nobody, dork."</a>
     
  6. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Hmm, I'd go with the smaller cam. I have the 210/218 cam running my 400 (still have to tear the block apart) and its supposed to do 398hp and 461 lb/ft of tq. The biggest mistake when first doing cams is over camming. The numbers are just marginally higher, but the motor will idle rougher and have less vacuum. You'll need a bigger torque convertor because bigger cams make less power on take off, hence the higher stall speed which lets the engine build up power.

    (My 400 figures are a little inflated because on my example I have lower friction bearings, roller tip rockes, vortec heads ported for 5% more efficency, fancy manifolds, no accesories, and open exhaust....if your exact motor where on the dyno it would do 344 lb/ft at 3,400 and 255hp at 4,200, with the 206/214 cam. I forget to mention how leaving off accessories and mufflers helps to inflate figures. I'm sure companies do that when they advertise there crate motors. Go with the baby cam , more low end power and smoother operation.)

    <a target="_blank" href=http://new.wavlist.com/movies/031/ag-blow.wav>"I ain't nobody, dork."</a>
     

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