What would it take to make 1.44 lbs-ft per cid ?
Now I'm not saying this chart is right, but as I figure out each decent heads port velocities they seem to fall in the 250-300 fps average range and the more impressive heads do seem to be closer to 260 fps. Now I could be calculating wrong, port length and even cc are hard info to come by.
Now stock 273/318/360 heads all seem to be in the 260's and they responded decently but not like LS and some of these other heads, For one I've only basically been looking at intake side, not the exhaust, chambers, port shape, the overall curve, port flow coefficients etc... But far as I can tell 250-300 is a good range to shoot for and closer to 260 the better but an hard number to hit cause it's seem it far easier to gain cfm than port volume which tends to push it towards the higher average fps.
The other questions I got, how does the fps change if you operating at an rpm higher or lower than ideal for a certain cid does that raise or lower fps ? Same with VE% what effect would that have on fps ?
Now I'm not saying this chart is right, but as I figure out each decent heads port velocities they seem to fall in the 250-300 fps average range and the more impressive heads do seem to be closer to 260 fps. Now I could be calculating wrong, port length and even cc are hard info to come by.
Now stock 273/318/360 heads all seem to be in the 260's and they responded decently but not like LS and some of these other heads, For one I've only basically been looking at intake side, not the exhaust, chambers, port shape, the overall curve, port flow coefficients etc... But far as I can tell 250-300 is a good range to shoot for and closer to 260 the better but an hard number to hit cause it's seem it far easier to gain cfm than port volume which tends to push it towards the higher average fps.
The other questions I got, how does the fps change if you operating at an rpm higher or lower than ideal for a certain cid does that raise or lower fps ? Same with VE% what effect would that have on fps ?