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How big of a cam can stock heads handle?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Lotsa_Faith, Jan 1, 2004.

  1. Lotsa_Faith

    Lotsa_Faith 1/2 ton status

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    What size cam can I run with stock heads, edelbrock intake and a holley carb?
     
  2. Z3PR

    Z3PR Banned

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    Need alittle more info. What are you after ??? What do you want it to do ??? I've ran some pretty big cams in the street rods with stock heads, but they wouldn't be worth a sh_t in a 4x4.
     
  3. R72K5

    R72K5 Banned

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    well depends on alot of other things liek axle ratio, intended driving conditions, etc etc.

    stock untouched heads were pretty bad about having casting flash and junk in the ports and sometimes not completely open ports, if you gasket match port out intake runners and leave them rough but remove bumps and such in them, and smooth out the exhaust ports then you can help flow tons, hog the intakes out to size of the gaket, get at least 1.50 and 1.92 valves, and rpm match the intake and carb and cam altogether to the rpm band you plan on running in, in which is determined by axle ratio, also get a torque converter that will stall higher than stock, but dont go wild on that, go with just what you need to run in band you want to run in where your HP and torque are mostly all at, but no more than that, stock crank only takes up to 5500rpm, so,,. also make sure the intake runners are ported out to same as heads intake runners are or it will ruin the whole point


    with a stock bottom end you are going to want a cam and intake through 5500 rpm and stall around 1500 probably, and 3.42 or 3.73 gears probably, and a stock Q jet would be good to run on that, you dont need so much fuel and air, with natural aspiration and stock compression ratio, you would jst be wasting alot of fuel, a q jet would be plenty


    the goal is to get a bunch of(or most of) the power out of your engine at below the limit of the crankshaft(5500RPM), and to be able to hit that rpm as close to a dead stop take-off as possible(higher stall converter) or you wil never feel it and that would be a waste
     

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