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Old 09-20-2003, 11:40 PM
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From what chevy high performance magazine says. The 305 vortec heads are not the same as the 350`s, they do not recommend they be used, they have a smaller port and don`t flow enough. this is not to say they won`t work, they will, but if you used the correct 350 vortec heads it would easily make 30 plus more horses than the 305 heads. placing 305 heads on a 350 is the same as making it breathe through a straw, the engine will be real throttle responsive and have good low end power, but will be a dead player from 3500 RPM and up. as for 11:1 compression on 93 octane gas, the only way that can be done is by using a big cam that bleeds off some cylinder pressure, or the timing set so low it wouldn`t make much power so what`s the point? many guys do this, and many have asked me about it, and I say don`t waste your time, we did it years ago, we ported a set of 305 heads and put them on a 350 with a bigger cam, headers, intake, carb, hot igntion and headers, it ran a decent time in the 8th mile, the next year we added a set of dart II heads and no other changes, it ran almost a half a second faster. you have to remember, flow IS power.
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