BOBS99SS

iTrader: (2)

I'm looking to get some heads for my 99ss,full bolt on ms4 cam,ok here is what the game plan is for next year,arp rod bolts,12 bolt 4.30s or 4.56s,ported fast 90,stage 1 t56 rebuild,I can't make up my mind on heads,I was looking at the prc 227 heads ,any of you guys run those,any numbers ,times or opinions,I also was looking at the 215s,but I think the 227s would be a better way to go,any suggestions,thanks guys God bless

BOBS99SS

iTrader: (2)

Haven't made up my mind on a gear to go with eithier,I want to spray a lil and untill I make up my mind on that I didn't wanna make a gear choice just yet,I would like to get into the low 11 second range,I don't know what the car runs now after the first round of mods,by the time it was done the track was closed for the year,I plan on a bunch of suspension also but most of that will be put together in the spring,just trying to get the big stuff out of the way,if any of you guys have some ideas that would better off my combo I'm all ears for ideas

Jason 98 TA

iTrader: (4)

The PRC 227 heads without a doubt would be my pick out of any head for a all out LS1 3.9" bore setup. The PRC 227 heads flow the most air of any production 3.9" bore cylinder head I've ever seen. That is the cylinder head we currently run on the fastest stock bottom end heads/cam car!

BOBS99SS

iTrader: (2)

Sold,lol

BOBS99SS

iTrader: (2)

Yeah I'm pretty set on those,I didn't really wanna go cheap on the heads,I hope they make for a pretty wicked head and cam setup,with the 4.56 gears that should make for some decent times,cobras will fall next year lol

j.timbs

That is pretty much the same set up im looking to go with but i have a trex

BOBS99SS

iTrader: (2)

Yeah I wanted to get at least mid to high 11s on motor,that should be pretty good for me next year,that should make for a pretty solid street car

john563

iTrader: (17)

How do these heads compare to your stage 2.5 5.3 heads? In other words if one has your 5.3 heads and swapped them out for these how much rwhp can someone expect

BOBS99SS

iTrader: (2)

I guess no one is running these yet? Would really love to see what people gained with these using a ms3,ms4 ,happy turkey day to all God bless

mike c.

iTrader: (1)

Talk about flowing more air but my cnc ported l92 heads out flow my trickflow heads by near 20cfm on the intake and yet i made the same peak power.I gained 20hp and 10lbs of tq all over under the curve and in some spots gaining 15lbs of tq. This tells me there must be more to a head then just airflow to make power.

1NASTYZo6

iTrader: (5)

Would that be velocity, tubulance, combustion chamber design, ect.
My .02

_GTO_

I'm not an expert but the air velocity is defiantly one of the important things you should consider when getting heads .

I don't know but the PRC 215 seems to be better on 3.900 bore (small intake runner will make the air faster) and it has the same exhaust flow that 227 has (correct me if I'm wrong) .

soundengineer

iTrader: (16)

I would think the Company that sells them and designed them....who posted above....
should be a good enough answer...

TSP runs them on their Record Holding Car.....not the 215's or the 237's or any other head... they run PRC 227's

I run the 227 head as well...
you can see by my graph in my signature how well this head flows... the broad and fairly flat torque curve shows how well it flows..
I'm running a 240/244 .608/.6122 113lsa+2 cam in a 408 with a fast 92/92
I shift at 6900

and on November 20th..I ran 11.9@123mph on 245/55/16 street tires

_GTO_

Off course , I didn't say that I know better than TSP , I really like the 227 and I pm'd Jon before regarding these heads but I guess I saw one of TSP guys said that for 346ci the 215 is good enough.

Nice dyno curve and like you said you have 408ci .

janaka

iTrader: (7)

For a regularly mod'd 346 I'm sure the 215's are a great match but Jason from TSP said for an "all out" 346ci the 227's would be a better match.

As usual its all about matching parts.

JustANoob

Actually according to the video on TSP website they run the 215s...with the MS4. So there's your answer.

http://www.precisionracecomponents.com/982pass.wmv

soundengineer

iTrader: (16)

was just quoting what he said here....

mike c.

iTrader: (1)

1NASTYZ06-My l92's were flowed before i got them and i got flow numbers from t.e.a on my tfs heads. the l92 heads had a higher flow according to the papers. and my trickflow gained more power under the curve and gained at the track a well. If i just went by flow numbers according to shops i would of chosen the l92's over the tfs.

soundengineer

iTrader: (16)

as your test shows... its not always about Flow #'s.. its about port velocity...