Comparing LS1 and LS6 heads and Cam for Power
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TECH Fanatic
Joined: Aug 2002
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From: Objects in mirror no longer matter.
Re: Comparing LS1 and LS6 heads and Cam for Power A disjointed question, but I will attempt to answer. First off, you ask what effects "velocity, tumble and swirl" differences between the LS1 and LS6 castings given "equal raw flow numbers". Well, the LS6's raised floor and smoother short turn radius change the velocity profile of the air charge. In other words: you can't change the velocity, tumble and swirl characteristics and still have EQUAL raw flow numbers <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Those factors directly effect flow numbers, so by saying two heads have equal flow numbers, the cam selection should be more or less equal. A better question would have been "how should I choose a cam to better match an LS6 head over an LS1 head?" That question is relatively simple to answer IMO since a hydraulic cam is limited to max lift of the lobe profile rather than a max lift where port stall occurs for both heads. In other words, stick as much lift as you can in the cam with either head and you are golden <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
On The Tree
Joined: Nov 2001
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From: Dallas, TX
Comparing LS1 and LS6 heads and Cam for Power Im curious of the bennefits of the LS6 head over the LS1 head.
Obviously the LS6 head has casted characteristics that make it be a higher flowing head, whether comparing LS1 stock, to LS6 stock, or ported to ported.
However, I was more curious about cam selection. Since the more aggressive/radical you go in a cam, the less drivability, and durability you have in your motor.
Is it possible to get any bennefits, of a ported LS6 head over a ported LS1 head (raw flow numbers being fairly equal), if not going with a very aggressive cam?
Empirically, what popular camshafts out there, looking at lift/duration metrics, would begin to utilize the design characterisics of the ported LS6 head, over the ported LS1 head, again, with raw flow numbers being fairly equal.
To me, the considerations, given equal raw flow numbers, become; velocity, tumble, swirl, etc.
Where do these characteristics in an LS6 head over LS1 head, given equal raw flow numbers, become a factor relative to cam selection and why?
Obviously the LS6 head has casted characteristics that make it be a higher flowing head, whether comparing LS1 stock, to LS6 stock, or ported to ported.
However, I was more curious about cam selection. Since the more aggressive/radical you go in a cam, the less drivability, and durability you have in your motor.
Is it possible to get any bennefits, of a ported LS6 head over a ported LS1 head (raw flow numbers being fairly equal), if not going with a very aggressive cam?
Empirically, what popular camshafts out there, looking at lift/duration metrics, would begin to utilize the design characterisics of the ported LS6 head, over the ported LS1 head, again, with raw flow numbers being fairly equal.
To me, the considerations, given equal raw flow numbers, become; velocity, tumble, swirl, etc.
Where do these characteristics in an LS6 head over LS1 head, given equal raw flow numbers, become a factor relative to cam selection and why?
