"Develop a new type of non PI head"??? "Changing the ports and stuff around"??? "Invent a new type of head for the 4.6"???tangerine said:it isn't that bad porting and polishing heads. I am in the process of trying to develop a new type of non PI head. I am trying to change the ports and stuff around to see if I can get some good gains out of it. I would like to invent a new type of head for the 4.6 since that department is lacking now. I had some extra heads laying around and I was just bored so I decided to hack them up and try something new.
No, you've got it backwards - I've got the brains NOT to try hacking a pair of heads.tangerine said:what I am doing is trying out different types or port sizes and styles and puttingthem on a flow bench to see if the velocity will rise and how many more cfms they will push. You can laugh all you want but just because you don't have the brains to try something new doesn't mean that I don't.
yes he is true, there was a writeup in MM&FF i think in which they showed the cfm numbers on ported NPI heads compared with PI heads and they were higher. until you port the PI heads that is.SMRcalidiv said:a friend of mine says that he was told his p&p'd non pi heads flow better than pi heads, something seems fishy about this though...
tangerine said:what I am doing is trying out different types or port sizes and styles and puttingthem on a flow bench to see if the velocity will rise and how many more cfms they will push. You can laugh all you want but just because you don't have the brains to try something new doesn't mean that I don't.
bierbelly said:Don't waste your money. I'm not convinced that you really get much if any gains out of P&P, and it's expensive to take off/put on the heads...I was going to say if you don't do it yourself, but considering all the new headbolts, gaskets, etc, it's even kinda expensive to do it yourself.
cobra killer said:Hmm..How about 267rwhp- 289TQ to 323rwhp and 324TQ with race ported heads on a low compression 99 GT..That convince you?
yes it is expensive tho....
Tim
bdcardinal said:yes he is true, there was a writeup in MM&FF i think in which they showed the cfm numbers on ported NPI heads compared with PI heads and they were higher. until you port the PI heads that is.
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