Thread: SBC Cylinder Head Info Request

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Those are the old "Power Pack" heads (neat sounding name, but pretty much obsolete). As mentioned they have relatively small runners and valves. A couple of other things that make them less than desirable are that they have no accessory bolt holes in the end of the heads which can make mounting accessories a challenge and they do not have hardened seats.

They could be opened up to 1.94 intakes, but trying to go out to 2.02s would likely put you into the water jackets.

I did a set of those heads about a year ago for an era correct 283 I was building. I went through then and with the machine work, new valves, hardened seats and opening them up to 1.94s etc, there were a lot cheaper alternatives out there. Even with the work I did on them I personally would not run them on anything bigger than a relatively stock 350.

Just my 2 cents.


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