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Thread: 1957 Power- Pac option

  1. #1
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    1957 Power- Pac option

    On the 1957 Chevrolet's , the power pac option included ; 4 barrel power pac heads, with bigger valves. 4- barrel intake, and carburetor. 4 barrel oil bath air cleaner,and dual exhaust. Bama can you tell me if the 4 barrel power pac version also used a different cam? How about the carburetor linkage? Is their something else different, besides the gas lines running on the outside of the frame on the 4 barrel car's ? I believe the 2 barrel versions put out 185 HP and the 4 barrel car's 220HP. I have heard that the 2 barrel car's will leave faster, because the 2 barrel carb's have bigger primary's , but when your rolling along at 40 or 50 and you get into it and the secondary's kick in, you know you have a 4 barrel . Also the Dual exhaust , must really make a difference.

  2. #2
    Registered Member BamaNomad's Avatar
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    I cannot tell you for certain re the cam, but I DO believe the power pak cam was different than the stock cam that came wtih the base engine. I think all you posted is correct. 35 hp difference is significant!

  3. #3
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    Forgot to mention that the distributor , is also different on the Power Pac 4 barrel version. The distributor has different mechanical weights, so the power band comes on differently than the two barrel version.

  4. #4
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    PP heads have same 1.72/1.5 valves as stock. PP heads are smaller chamber for more compression.

  5. #5
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    Thanks', the knowledge is priceless, and disappearing. Dom

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