Theoretical H/C question
10-23-2009, 03:11 PM
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Theoretical H/C question I was just wondering, if one were to put a set of ported ls6 heads on a 346 and it gained say, 40HP, then you swapped the same heads onto a 402, would they gain more than 40HP over the stock ls2 heads?
What I'm asking is, do heads react better to bigger cube motors? If i were to go from 346 would the heads make a bigger difference?
I hope this is clear.
Thanks.
What I'm asking is, do heads react better to bigger cube motors? If i were to go from 346 would the heads make a bigger difference?
I hope this is clear.
Thanks.
10-23-2009, 03:23 PM
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that depends on many things, such as runner size, as well as the which heads were being compared to. As a rule of thumb, you increase the displacement, you increase the runner size proportionally, but just as much success could be had with small runners.
Typically there is a balance between intake velocity as well as flow. Sure you can make a head that flows all out, but that also decreases velocity, so there is a fine line to be had.
Typically there is a balance between intake velocity as well as flow. Sure you can make a head that flows all out, but that also decreases velocity, so there is a fine line to be had.
10-23-2009, 05:12 PM
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When you see 205 vs 215 vs 225 etc, is that runner size? I see that on a 346 people are having the best luck on 205's, would it be safe to say that a 402/416 would benefit from a 215?
Does a runner size too big for a particular motor hurt performance everywhere or just down low?
Thanks for clearing this up, i did search, but the information is unclear.
Does a runner size too big for a particular motor hurt performance everywhere or just down low?
Thanks for clearing this up, i did search, but the information is unclear.
10-23-2009, 07:13 PM
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is would gain more also depending on bore size, if you swapped the heads onto an engine with a bigger bore you would be unshrouding the valves which should show more gains.
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10-24-2009, 08:37 AM
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You mean that a bigger number of cubes does not tell us whether it is a larger bore or a longer stroke?
In that sense, when is an engine a stroker. I know it means you have a longer stroke, but a longer stroke than what? Does stroker just mean the stroke is bigger than the bore? Or is there a formula for it?
In that sense, when is an engine a stroker. I know it means you have a longer stroke, but a longer stroke than what? Does stroker just mean the stroke is bigger than the bore? Or is there a formula for it?
