95DarkGreenGTS
Active Member
Im just wondering I hear people talk about Pi non PI heads whats the difference?
Non PI and PI ?
- Thread starter 95DarkGreenGTS
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DropTopPony
Post Whore
Tbuck07 said:
People can ask anything here, even if its been covered 9000000 times.
If everyone just used the search feature then nothing would ever get posted and the forum would die a slow death... kind of like Modular Depot, did because all the people were grumpy know it alls who kept badgering noobs with SEARCH BEFORE YOU POST BS.
If the veterans don't feel like answering a question they just ignore it, by giving attitude to a potential long term member they may just say F this place i'll go somewhere nicer.....
AaRoN
King Post Whore
P.I. stands for "performance improved". When you hear "N.P.I.", that means "non performance improved".
LI98GT
Well-Known Member
The stock camshaft lift for 96-98's (NPI) are 473/.473-inch lift and PI 99-04's are .505/.534-inch lift. PI heads flow a lot more than NPI (stock) and NPI intake has short length runners where the PI intakes have long length runners. Add them all up and you get your ~35hp PI over NPI.
The last two responses...
Yes, we here are ready to answer the same questions over and over... and we get better at our answers each time for our SN-95s. This is not that sort of site where we pump up our chests cause the question was asked before. And I hate when we state political responses that make us hate each other.
From my experience, NPI has "tear drop" ports compared to "squared" "PI" ports... PI ports have better air flow. Also, the manifold has different intake runner lengths again resulting in better air flow. Out side of that, I'm sure someone else can clime in to add to the differences. PI had 35 extra hp than NPI '98s and 45 more hp over the NPI '95 through '97s...
Not a real problem correcting this.
Yes, we here are ready to answer the same questions over and over... and we get better at our answers each time for our SN-95s. This is not that sort of site where we pump up our chests cause the question was asked before. And I hate when we state political responses that make us hate each other.
From my experience, NPI has "tear drop" ports compared to "squared" "PI" ports... PI ports have better air flow. Also, the manifold has different intake runner lengths again resulting in better air flow. Out side of that, I'm sure someone else can clime in to add to the differences. PI had 35 extra hp than NPI '98s and 45 more hp over the NPI '95 through '97s...
Not a real problem correcting this.
AaRoN
King Post Whore
Also, one nice little tidbit that may or may not mean anything; the P.I. intake outflows an LS1 intake.
Codycougar91
Member
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basically, a "PI Swap" is required for anyone with a mod motor who wants to make some serious hp down the road
GDTrumbo
Well-Known Member
BrandoGT said:
......when PI heads are installed on a '96-'98 short block.
GT
