K20 & K24
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By kylenjdm93
#325787 4 piston racing by far has the best flowing heads on the market

check out the 165 by 4 piston!

get a decent a2 head and your well on your way, even the a3 head apex! as you can convert it to full on vtec or buy another single rocker and run vtec killers

ill post more about it tomorrow think of this as a teaser!
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By kylenjdm93
#326000 alright so the pricing is high but the flow rate of a k series head ported is crazzy

up to 300cfm's!

blueprint racing does decent head porting, and asp does some by hand

cnc porting is the best bang for the buck, a computer controlled cnc machine will do more than anybody can by hand keeping each port the same is the only way you will get accurate flow in each cylinder