305 heads on a 350

Discussion in 'GM Powertrain' started by dwgmc1313, Aug 13, 2009.

  1. dwgmc1313

    dwgmc1313 New Member

    Ok, I have read alot about these 305 heads (601) castings and I have heard great things and bad things. I got these head completely rebuilt and with 2.02 and 1.60 valves. No port work has been done. I plan on running these with stock bottom end, lunati bracket master II, edelbrock rpm performer Intake and carb 600 cfm, and long tube headers. I was curious what type of hp I can expect? I am also looking at dish pistons. What compression will I run with this setup. thanks for answering a rookies questions.
  2. spottweld

    spottweld New Member

    305 heads

    The 601 heads are so so, first off the 305 bore is too small for 2.02 intakes, dont get me wrong I did it years ago and when i put a 510 lift cam i bent my valves. I seriously doubt that you have 2.02's but the 1.94's are good for building torque. It is good that they are not ported for there isn't much room for porting before you hit a water jacket. Yes they do have a little smaller chamber than most smog motor 350 heads and probably will raise you compression ratio but dont expect much more than 9 to 1. you would be a wise man to get a set of vortech heads and you will be guaranteed 25 hp youll be lucky to gain 10hp with these heads
  3. dwgmc1313

    dwgmc1313 New Member

    I"m putting the 305 heads on a 350, not a 305....so bore should be fine.

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