318 Poly Flow Test

Killer6 said
Dude, wtf does that have to do with comparing a Poly head to an LA head? And if You're a Mopar Guy with all of these tech answers, how do You not know or have a reference at Your fingertips what the installed ht. Polys have...??? Gary Pavlovich & crew have probably done as well as will be done with a Poly, with some modern upgrades, it may cough up a few more hp....but at what cost?? You should look up the Chrysler Power articles & anything related to the PolyPac folks, including the one run in the Engine Masters competition.....it's been done..
This was supposed to be a comparison thread, I thought anyways,......trick valves, custom lengths & springs can be done to ANY head....what is the comparison in results 'twisted wedge before twisted wedge was a thing' Polys vs inline wedge LA 'teener heads.

OOOH, someone got out of the wrong side of the bed. Maybe time for an afternoon nap today, get your beauty sleep, eh.
Earlie A was comparing two heads and mentioned valve sizes. I just post a possibility that is inexpensive to a degree. Yes machining to put the 8mm guides in is costly. But good chance those poly heads are due for guides anyway. Whether you chose the Magnum or LS valves, the smaller stems provide much lighter valves. I would venture the LS have a lower cost.
Intake flow is area ruled up to a lift of 1/4 the effective valve diameter which is 0.91 × measured head diameter. So a 1.84" valve has an effective seat diameter of 1.6744". That × .25 is about 0.42", so the valve is in most cases the limiting factor in port flow up to that lift. At higher lifts the port flow is more the limiting factor. Old engines only had about 0.375" lift, so big ports were not required. Stovebolt Chev 6's only had 0.3" lift, definate tractor engines.
Your choice what you want to do with that information.