Factory cast iron vs alum logs, any difference
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Factory cast iron vs alum logs, any difference

  1. #1
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    Default Factory cast iron vs alum logs, any difference

    Got a PCM 454 330hp with some rusty iron factory manifold/risers. I also have some old alum logs with snails available. Is there any performance difference between these two options? I realize that neither are great for high performance apps but was just wondering if going to the logs would have a detrimental effect......

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  3. #2
    Senior Member Schiada 201's Avatar
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    Certainley the weight factor is. depends on the style used as their are many.

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    The cast units are center riser and the alum's are the old M1's if that gives you any info! I'm mainly wondering the effect at low to mid range rpm's.

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    whoops, actually M2-4's

  7. #5
    Senior Member MACHINEHEAD1's Avatar
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    At 330 hp, it wont be a big power robber. You may sense a little soggy-er throttle on the bottom-mid. The center risers have a little bit more primary lenth which helps the throttle response.. The logs look better and are lighter. Run um!

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