when talking about heads, what is PI and Non-PI??? this may be a stupid question but ive been trying to figure it out myself and have so far been unsuccessful 
Thanks!
Thanks!
What does PI mean?
- Thread starter smokin'Red35th
- Start date
so what the hell is the point of Non-PI, i have seen that come up in conversation on some threads here. Their not talking about stock cus they specified. Also, do they have that kind of improvement on a 99GT?
so do 99s have PI heads stock? if so, then to gain from aftermarket heads do you have to have them ported? I'm asking because I am planning on supercharging my car in a year or two but I want to replace the heads first, and i know next to nothing about them.
would that be worth the time and cost of porting? do you know any approx. HP gains? Like i said, im still kind of a newbie when it comes to this stuff. Only owned the stang for a year, most of that time has been spent away from it......(again---> )
EDIT: BTW, thanks man! Your being a huge help!
EDIT: BTW, thanks man! Your being a huge help!
so pulling the heads having them polised and ported wont do anything to make it worth the money?
so what kind of gains do you think i would be looking at with a port and polish of my stock heads on the 99GT? The way it was explained to me is that the stock heads are pretty much the best on the market? and the only way to increase performance is to pull them and do a port/polish. Forgive me if i understood what Roger_4.6_96 told me. Am I correct in this assumption and what kind of gains would i get with a port/polish of the stock heads?
thanks! now that leads to another question that has been coming up. when i do forged internals (cuz i will be supercharging) what do i do? forged rods? pistons? crank? or all three? anything else forged???
There are a bunch of companies out there that have internals kits. Personally I like Steeda's rotating assembly kit because of how complete it is, but there are plenty of others on the market.
Generally you want new pistons, rings, rods, studs, gaskets, bearings, oil pump, and crank. You might also want a new higher capacity better design oil pan, flywheel, and balancer.
Make sure that whatever you get will put you at the right compression ratio for the boost that you want to run.
Generally you want new pistons, rings, rods, studs, gaskets, bearings, oil pump, and crank. You might also want a new higher capacity better design oil pan, flywheel, and balancer.
Make sure that whatever you get will put you at the right compression ratio for the boost that you want to run.
check out www.modulardepot.com www.modularfordpowerhouse.com and modularperformance.com for some forged sets...you would want to get the whole bottom end forged
mity2
I like Pro3 and all I got was this crappy CT.
Roger_4.6_96 said:in 99 they got 265 bhp
260hp BTW. Off topic, but i wish there is some aftermarket heads out for 4.6... I went to yahoo, and typed Mustang 5.0 head, and I got about 100 different hit....
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