Have you put both heads on a flow bench? I heard from a very reliable source that the heads have the same ports.fearless_dsm said:Which model/engine do you have?Ive got a ported base head that i did.I charge a little more for "s" heads because they are already really good from the factory and there isnt much to clean up,so it takes more skill to produce more power from those heads.But the base heads can easily be improved on,as theyre horrible,not the casting,but the shape.It was cast like that on purpose to improve economy and emissions,and not allow for fuel pooling on the back of the non used valve under 2200rpm,but for performance it sucks.If youre interested,pm me and ill provide you with pics,pricing and answer any other questions you have.Power gains depends on the head porter and what type of port you request.
I think I'll send them my head for a free port & polish. No way they can get 20HP just from P&P on the K20A2 head.Sacrifice said:That R & D 20 HP guarantee says "Most engines". I'd ask before assuming that the guarantee applies to a K20A2.
The porting itself was $800, the $1800 price was for valve springs, and new valves installed along with the P&P. I'll have to check king out though too.FireHawk said:mugen has head P&P for sale now through king motorsports, or maybe it is offered by King. Anyways they have it and it is a whole lot cheaper than 1800 package R&D offers (like 850). And the main problem edo had was that he could not find a cam that would utilize the flow potential of his ported head. I also think he did an almost full race port, but that was a while back when I read that.