How are these #'s for cnc 243's?
I apologize if I am asking a newbie question here..
If you aren't looking for flow much above .600, does it matter? Does this matter if I'm planning to run a .600 lift cam? Are you saying that turbulence that occurs, say, at .630 lift is indicative of similar or other issues at lower lift?
Thanks..soaking in the knowledge..or pretending to.
If you aren't looking for flow much above .600, does it matter? Does this matter if I'm planning to run a .600 lift cam? Are you saying that turbulence that occurs, say, at .630 lift is indicative of similar or other issues at lower lift?
Thanks..soaking in the knowledge..or pretending to.
A cylinder head is normally tested and flowed at 28" of depression on a flow bench.
A running engine may see 60", 80" even 100" of depression in some high end finely tuned race engines(think Comp Eliminator or Pro Stock). A flow bench cannot simulate this and only certain wet flow benches are equipped to do so. Even then they can't come close to what a running engine may see on the intake stroke.
A head that stalls or goes turbulent at .600" lift on a flow bench flowed at 28" may in fact stall or go turbulent well below .600" lift on an actual running engine.
A running engine may see 60", 80" even 100" of depression in some high end finely tuned race engines(think Comp Eliminator or Pro Stock). A flow bench cannot simulate this and only certain wet flow benches are equipped to do so. Even then they can't come close to what a running engine may see on the intake stroke.
A head that stalls or goes turbulent at .600" lift on a flow bench flowed at 28" may in fact stall or go turbulent well below .600" lift on an actual running engine.
Martin- These are the heads I was inquiring about the other day when I was ordering the cam kit etc.. for my lq4 build. I was hoping to get some insight on if I should pull the trigger on these or not. Otherwise I will leave my castings stock until funds allow for a more reputable outfit to port them.
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Probably just didn't want to remove any more material from that area. I would consider that a cosmetic thing and not judge it good or bad.
You can't tell a good port by a pic, sometimes you might see something bad like the LT1 owner who was proud of his .030" crooked milled heads......... That was end to end and nobody in the following 80 posts pointed it out. Which brings me back to my comment about "do you even know how to evaluate good?"
You can't tell a good port by a pic, sometimes you might see something bad like the LT1 owner who was proud of his .030" crooked milled heads......... That was end to end and nobody in the following 80 posts pointed it out. Which brings me back to my comment about "do you even know how to evaluate good?"
Wonder what's the theory behind leaving that part untouched?
No I do not, hence asking all the questions. If I knew, I would either buy them or move on and not ask an opinion. I appreciate the feedback on them. How did you learn to evuate "good"?