fst100

iTrader: (5)

my original intent was to go F/I with a procharger setup but i've been thinking about jusy staying N/A. what are my options of bumping up my compression ratio with my cam specs? i am uncertain on the PTV clearance so those who are way more mechanically savvy i'd really appreciate your inputs and suggestions.

im currently running ported and 3-angle valve job 317 heads with colorado speed gold dual springs, chromoly PR, LS6 lifters, and here's my cam spec 232/238 .599"/.601", w/ls6 manifold.
current whp wise i imagine its sitting around 370-380 as it traps 114-115mph at around 300' above sea-level. i would like to shoot for 450-475whp if that's doable on heads alone.

conan

iTrader: (5)

If it were me I would stay with the procharger plan. I love my D1 procharged car.

If your set on staying N/A I would sell the 317's and pick up some 243's and get the compression back up.

fst100

iTrader: (5)

if i go with a procharger i'd just get a P1SC, only looking to get around 500-575whp if thats attainable on 8psi. D1 or even a F1 style is way out of my budget and im not planning on forging the LQ4 block.

A.R. Shale Targa

iTrader: (2)

IIWM I'd consider some Trick Flow as cast 220's set up TEA or Brian Tooley
with powdered metal guides and perhaps some turned down LS3 valves.
These will flow tremendous amounts of air, jack the compression back up,
and the 13.5 degree valve angle will help with your piston to valve clearance.
Your power level will be met rather easily.

Detoxx03

iTrader: (14)

I'd stick to the blower route. You will be kicking yourself if you don't.

fst100

iTrader: (5)

maybe but perhaps it's that im getting older and being quickest around the are isn't important but just enough would suffice. so im now leaning towards 70% if staying N/A. the 317 heads right now im running lunati double valvesprings with max lift of .660" and ls7 lifters, TR .080 7.4" pushrods. with those specs and the cam specs in post #1, any idea on what type of head options are out there? get a set of 243s or 799s and swap the pushrods, springs, and lifters over? just concerned with the PTV clearances and such. would like to have the CR 10.1:1 or as high as possible with the cam and other parts re-useable please. :-)

TIA

fst100

iTrader: (5)

or possibly just mill the 317 heads some?

fst100

iTrader: (5)

ok, im leaning toward staying n/a. after some reading i can get either 243s or 799s. was thinking about being able to swap the parts from the 317s over to the 243/799 like the TR 7.4" PR, .650" dual springs and ls7 lifters. was thinking about milling the 243/799 to 0.020 or maybe 0.030 and if possible to using ls3 HG? or what HG should i go with and whether measuring the PTV clearance? was also thinking about doing a 3-angle valve job as well? that'll bump the compression up past 10.1 or 10.5:1 if going unported 243s???

fst100

iTrader: (5)

bueller? bueller? bueller?

intenseblue

iTrader: (1)

Youd want the blower but if not id pick up some 243s a.d send them to TEA

fst100

iTrader: (5)

yea im most likely sticking the N/A route. i'll be content on mid 400 whp if thats attainable bumping up the compression ratio. plus its about third of the price of what a blower kit goes for. the only things im concerned is PTV and pushrod length.

MikeWS6

Mines close to that with heads/cam but now I want a procharger.

luigiandme

iTrader: (2)

If you're looking for 450+rwhp you're going to have to send those heads out and get them ported. Not sure which intake manifold you're using but the LS6 wont cut it.

Go with the Procharger setup. It may cost a little extra but its a nice gain in power and theres always room for improvement with a blower setup.

intenseblue

iTrader: (1)

Ls6 intake WILL make 450+

99Bluz28

iTrader: (35)

What the LSA on you cam and the ICL(advance).

fst100

iTrader: (5)

113/109 lsa/icl

fst100

iTrader: (5)

i found the spreadsheet for calculating DCR but apparently there are a few variations thats floating out on the net. specifically the values that are in there already under the cam duration@0.200
any body have any idea on how to calculate those? i plugged my specs on teh cam and motor and it shows a DCR of 8.66:1. is that correct?

99Bluz28

iTrader: (35)

Did you plug-in the intake and exhaust duration at .006" for the particular lobes on you cam..?
..also what head gasket thickness are you figuring it with?

fst100

iTrader: (5)

yes under the DCR Manual Calculator tab for those uncertain which tab to go to.

99Bluz28

iTrader: (35)

So you put in the correct duration(for your cam) for the intake and exhaust .006" in line 3 and 4 of Column B?