Smashmix

Ok I bought a 2002 z28 from a guy it has a 6.0 motor 317 heads 228r cam slp lid stock throttle body I'm wanting to know which direction bolt on wise I should start to go in adding horsepower to my car I'm gonna be adding a 125-150 shot also
Thanks for the info guys

conan

iTrader: (5)

What does it have for an exhaust ? Transmission ?

airfinrob

Headers and exhaust is a great place to start.

Blackpanther99

iTrader: (8)

Get some long tube 1 7/8 headers to start off with.

Smashmix

It has the long tube headers to a y pipe then to a 2.5 in manga flow glass pack dumped by rear passenger wheel
It has a 4l60e with a shift kit

conan

iTrader: (5)

Well then you already have an exhaust and I'm ASSuming because its a 02 he swapped over the ls6 intake manifold to the 6.0 .

SO...
I would either do a set of 243 heads to raise the compression... First choice
You probability have a LQ4 (more common the the LQ9) witch has dished pistons... 9.5:1 compression.

A fast 102 would be my second choice. Then hit it with a 150 shot.

When you say "Shift Kit'' do you mean a higher stall converter ?

Blackpanther99

iTrader: (8)

x2 on the 243s on that case. Port them and mill them while you are at it if you can

Smashmix

The car has an lq9 with 317 heads I'm guessing since I've seen those heads on Craigslist for 100-150 that they are not great heads I'm looking into a new intake,coil packs,maybe going aftermarket cold air intake oh and I just bought a 125 shot nos kit today anyone recommend a certain cam I like the more aggressive cams so a cam and head combo are definently on the top of the list

conan

iTrader: (5)

The 317 heads are one of the best flowing GM head, they just have the biggest combustion chamber size... 72cc So unless your going forced induction or big CI they aren't as desirable of a head as the 243's, that flow as good as the 317's with a smaller cc combustion chamber (64cc i think).

Save your money on the coils, the OEM units have made 1,000+ hp. Use the money for a intake or a H/C package.

What is your budget for heads/cam ?
Also if you do have a LQ9 you have flat top pistions and 10:1 compression with the 317 heads. So a smaller cc head will get you in the 10.5:1 - 11:1 compression range.

Smashmix

Im hoping I can find a h/c combo for sround $1500 that pkus the nitrous should get my car movin pretty good next year im thinking superchatger or turbo lol

conan

iTrader: (5)

If your serious about forced induction I would leave the H/C alone. You'll want to use the 317 heads and if your going to buy a cam get a FI specific grind.

Hit that thing with a 150 shot as it sits. You'll be pleasantly surprised

Smashmix

Thanks Conan thats my plan got 1 hell of a deal on a full nos system ready to install it tomorrow

conan

iTrader: (5)

Transam9973

agreed 317 are a great heads to start with. if you have and lq4 I wouldnt add nitrous there not high enough compression. I would get a set of ls3/l92 heads before nitrous. or turbo or superchage they both like the low lq4 compression ratio

Transam9973

leave it as it is. and add supercharger or turbo they both love those 317 heads. look in the forced induction section for more info on the 317s