Going LS1 Ws6 FI TVS2300
Thread Starter
Teching In
Joined: Oct 2021
Posts: 11
Likes: 6
From: Hamilton
Going LS1 Ws6 FI TVS2300 Hey guys, just wondering if I could get a 2nd opinion (or more 
) on what info I've gather here so far in terms of going on the path of FI, particularly the selection on heads when it comes down to optimal compression and flow.
-Have an 02 Ws6 w/t56
-Going maggy Tvs2300 hawks kit
-Goal 550-680ish -/+ rwhp
From what I've gathered so far there are a few options to choose from when choosing the type of heads to go pair with the LS1 when going boost, I've been seeing alot of talk about going with the 317 heads (currently have 241 heads) I've also looked into 243 heads, but might be too high of CR but could be remedied by dished pistons or something for more CC..
317 heads 71cc stock gasket .058 9.6:1 CR
317 heads 71cc LS9 gasket .051 9.7:1 CR (im thinking this is the one to go with? If so would anyone know the pushrod size to go with?)
317 heads 71cc cometic gasket .040 10:1 CR
Will also be doing rods and pistons, I might go with what they have at summit direct (pro LS) hence asking earlier about dished pistons with 243 heads if it'll perform better than the 317 heads, Though I hear they flow pretty similarly. The thing is I get can a set of 317 heads for like 50- $100 👀
Trying to control cost, i think the stock crank can handle the power, though I assume even if I select good quality forged pistons and rods with the same specs as stock size the rotating assembly will still have to be balanced?
or maybe there's also a few secret sauces I've missed? 🤔
Thanks guys!!
) on what info I've gather here so far in terms of going on the path of FI, particularly the selection on heads when it comes down to optimal compression and flow.-Have an 02 Ws6 w/t56
-Going maggy Tvs2300 hawks kit
-Goal 550-680ish -/+ rwhp
From what I've gathered so far there are a few options to choose from when choosing the type of heads to go pair with the LS1 when going boost, I've been seeing alot of talk about going with the 317 heads (currently have 241 heads) I've also looked into 243 heads, but might be too high of CR but could be remedied by dished pistons or something for more CC..
317 heads 71cc stock gasket .058 9.6:1 CR
317 heads 71cc LS9 gasket .051 9.7:1 CR (im thinking this is the one to go with? If so would anyone know the pushrod size to go with?)
317 heads 71cc cometic gasket .040 10:1 CR
Will also be doing rods and pistons, I might go with what they have at summit direct (pro LS) hence asking earlier about dished pistons with 243 heads if it'll perform better than the 317 heads, Though I hear they flow pretty similarly. The thing is I get can a set of 317 heads for like 50- $100 👀
Trying to control cost, i think the stock crank can handle the power, though I assume even if I select good quality forged pistons and rods with the same specs as stock size the rotating assembly will still have to be balanced?
or maybe there's also a few secret sauces I've missed? 🤔
Thanks guys!!
Last edited by Ivan02ws6; Oct 16, 2021 at 06:44 PM. Reason: Spelling
First question, What fuel are you going to run? How much boost do you plan on running? One thing to think about when picking heads, Whatever the engine makes NA will translate into what it makes under boost. Basically if the heads you pick will improve power NA they will also improve power under boost by a like amount.
Depending on fuel you'll run you'll want to stay between 9:5 and 10:0, You can make it work higher that that but with a roots style blower there is no real for higher compression like the turbo guys do to give the engine more torque while not seeing boost. You'll make tons of low end torque even at 9:1.
If you can afford to get the 317's cnc ported you should easily hit your goal and probably run less boost while doing so.
Depending on fuel you'll run you'll want to stay between 9:5 and 10:0, You can make it work higher that that but with a roots style blower there is no real for higher compression like the turbo guys do to give the engine more torque while not seeing boost. You'll make tons of low end torque even at 9:1.
If you can afford to get the 317's cnc ported you should easily hit your goal and probably run less boost while doing so.
Thread Starter
Teching In
Joined: Oct 2021
Posts: 11
Likes: 6
From: Hamilton
First question, What fuel are you going to run? How much boost do you plan on running? One thing to think about when picking heads, Whatever the engine makes NA will translate into what it makes under boost. Basically if the heads you pick will improve power NA they will also improve power under boost by a like amount.
Depending on fuel you'll run you'll want to stay between 9:5 and 10:0, You can make it work higher that that but with a roots style blower there is no real for higher compression like the turbo guys do to give the engine more torque while not seeing boost. You'll make tons of low end torque even at 9:1.
If you can afford to get the 317's cnc ported you should easily hit your goal and probably run less boost while doing so.
Depending on fuel you'll run you'll want to stay between 9:5 and 10:0, You can make it work higher that that but with a roots style blower there is no real for higher compression like the turbo guys do to give the engine more torque while not seeing boost. You'll make tons of low end torque even at 9:1.
If you can afford to get the 317's cnc ported you should easily hit your goal and probably run less boost while doing so.
I have the option to run 94 where I'm at, but I usually run 93 90% of the time, 91 in a pinch. Don't mind running 94 though.
I'm thinking at least 8-10 lbs of boost
Thats good to know that one can dip lower on the compression scale closer to 9.1 and still make great torque with a supercharger, prolly will also give the bottom end an easier time too..
I might as well definitely get the 317 cnc'd if that's the case for more power and less boost
I'd keep the CR above 10:1. I've had TVS2300's on four different LS engines. Two on stock bottom LS3's at 10.7, one built 6.0L at 10.5 and a stock bottom L33 at 10:1. First two were in C6 Vettes. The last two engines were in a heavy assed pickup truck. Still running the L33 without the blower. That particular TVS2300 finally gave it up after only 250,000 miles.
Don't skimp on your fueling and definitely have someone familiar with tuning PD blown LS engines do the calibration. The strongest/most expensive bottom end on the planet won't survive if it starves for fuel or runs with a crappy tune.
I agree on having the heads ported if you can swing it. Tx Speed does it for $800. That includes CNC port work, multi angle valve job, milling if you want it, and assembly with your valve spring of choice. Lot of bang for your buck right there. That, along with a blower cam, will lower your boost considerably. Less boost = less heat. Absolutely no need for a big cam either. How fast you spin the blower will have WAY more effect on power levels than a monster cam. I used a Cam Motion custom 218/230 118+2 .610 lift in the L33. Slightly bigger in the LS3's. The LS3's made mid 600's at the wheels with 9ish PSI. Both had manual transmissions. The truck made quite a bit less mostly due to a 4L80 transmission and heavy truck rear end.
Don't skimp on your fueling and definitely have someone familiar with tuning PD blown LS engines do the calibration. The strongest/most expensive bottom end on the planet won't survive if it starves for fuel or runs with a crappy tune.
I agree on having the heads ported if you can swing it. Tx Speed does it for $800. That includes CNC port work, multi angle valve job, milling if you want it, and assembly with your valve spring of choice. Lot of bang for your buck right there. That, along with a blower cam, will lower your boost considerably. Less boost = less heat. Absolutely no need for a big cam either. How fast you spin the blower will have WAY more effect on power levels than a monster cam. I used a Cam Motion custom 218/230 118+2 .610 lift in the L33. Slightly bigger in the LS3's. The LS3's made mid 600's at the wheels with 9ish PSI. Both had manual transmissions. The truck made quite a bit less mostly due to a 4L80 transmission and heavy truck rear end.
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317 CNC ported heads and LS9 gaskets.
Had those same heads on my last turbo car with a mystery turbo cam it made 700+whp at 13-14 lbs. on pump 91 only on an SBE LS1 for years.
I'd give up the point of compression for boost any day.
Blowers are a little different but that lower compression can be a bit of a safety net should you get a crappy tank of gas.
Had those same heads on my last turbo car with a mystery turbo cam it made 700+whp at 13-14 lbs. on pump 91 only on an SBE LS1 for years.
I'd give up the point of compression for boost any day.
Blowers are a little different but that lower compression can be a bit of a safety net should you get a crappy tank of gas.
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Verdad Gallardo I'd add a point of compression any day to a low boost engine. No reason to skimp on CR is you're limiting yourself to 10psi. What's the point of adding a blower if you want to throw power in the dumpster with a low static CR? I've run +/- 10psi for years on pump 93 with no ill effects. Literally 100's of thousands of miles.
I'd add a point of compression any day to a low boost engine. No reason to skimp on CR is you're limiting yourself to 10psi. What's the point of adding a blower if you want to throw power in the dumpster with a low static CR? I've run +/- 10psi for years on pump 93 with no ill effects. Literally 100's of thousands of miles.
Lets keep the boost and power low said no one ever.
Here's a crazy fact for you. You can make 6, 7, or 800 horsepower at 10.5:1 compression ratio. It just takes less boost to do it. Less boost equal less heat. I'm sure you know how that works. With more CR you get better manners, better fuel eco and a more efficient engine. All kinds of better street attributes. Just curious here.....have you had any experience with a TVS blower? I'm going to jump out on a limb here and guess not.
Here's a crazy fact for you. You can make 6, 7, or 800 horsepower at 10.5:1 compression ratio. It just takes less boost to do it. Less boost equal less heat. I'm sure you know how that works. With more CR you get better manners, better fuel eco and a more efficient engine. All kinds of better street attributes. Just curious here.....have you had any experience with a TVS blower? I'm going to jump out on a limb here and guess not.
Point for pound you make more power with boost than compression, that's a fact.
We're talking about less than one point of compression not like going from 10.5 down to 9:1 so no one is suggesting "dumping" compression here.
The difference in street manners is non-existent with a loss of less than .6 points in compression and no one cares about fuel economy with a blown V8.
The slightly softer compression provides a cushion in the event the op gets a bad tank of gas because that does and will happen.
The op isn't running an LS3, 6.0L or an L33, he's running an SBE LS1 and those rods do not like lots of low end torque which a higher base compression will generate.
Tune the car on 91, run 94 when available or when racing, then the op is covered for DD duty.
Dang it. I guess I misread the first post in this thread. I thought "Will also be doing rods and pistons" meant he was doing rods and pistons...as in forged rods and forged pistons. I guess he could do 30 cc dished pistons and live with a 6:1 static CR. That would be super safe, wouldn't it? Just turn up the boost right? Lean on that little 2.3L blower like it has an infinite amount of air flow potential. Smart guys trying to make a small PD blower do big blower stuff is what gave them a bad name in the eyes of so many clueless folks. Not saying you're clueless, just that I politely disagree with you.
Its okay to disagree and I agree with your point of not dumping compression but again no one is saying that and now your down to 6.0:1 so....
OP: Keep the compression in the 9.7-10.25:1 range and you'll be money, the 2300 won't care about .5 points of compression.
Confirmed with a local gent here who runs the TVS2300 on a SBE LS1 w/ stock 317's, LS9 gaskets and a small cam makes about 560whp through a T56 on pump 91, he just keeps the timing a little low in the lower rpm range to save the stock rods plus its DD for him so he isn't pushing it too hard.
If you order the Summit pistons and rods, either combination will work very well, don't think if you go to 317's that the car will be a pig or something because it won't.
Flat top pistons / CNC 317's / LS9 gaskets - 9.7:1
Flat top pistons / CNC 243's / LS9 gaskets - 10.25:1
Old timer is correct in that the TVS2300 will only move so much air before turning into a heat pump, if you want to squeeze every last bit out of it then go higher on the base compression but make sure your tuner is competent because not even forged pistons will save you from bad gas and detonation.
Good luck with your build.
OP: Keep the compression in the 9.7-10.25:1 range and you'll be money, the 2300 won't care about .5 points of compression.
Confirmed with a local gent here who runs the TVS2300 on a SBE LS1 w/ stock 317's, LS9 gaskets and a small cam makes about 560whp through a T56 on pump 91, he just keeps the timing a little low in the lower rpm range to save the stock rods plus its DD for him so he isn't pushing it too hard.
If you order the Summit pistons and rods, either combination will work very well, don't think if you go to 317's that the car will be a pig or something because it won't.
Flat top pistons / CNC 317's / LS9 gaskets - 9.7:1
Flat top pistons / CNC 243's / LS9 gaskets - 10.25:1
Old timer is correct in that the TVS2300 will only move so much air before turning into a heat pump, if you want to squeeze every last bit out of it then go higher on the base compression but make sure your tuner is competent because not even forged pistons will save you from bad gas and detonation.
Good luck with your build.
Its okay to disagree and I agree with your point of not dumping compression but again no one is saying that and now your down to 6.0:1 so....
OP: Keep the compression in the 9.7-10.25:1 range and you'll be money, the 2300 won't care about .5 points of compression.
Confirmed with a local gent here who runs the TVS2300 on a SBE LS1 w/ stock 317's, LS9 gaskets and a small cam makes about 560whp through a T56 on pump 91, he just keeps the timing a little low in the lower rpm range to save the stock rods plus its DD for him so he isn't pushing it too hard.
If you order the Summit pistons and rods, either combination will work very well, don't think if you go to 317's that the car will be a pig or something because it won't.
Flat top pistons / CNC 317's / LS9 gaskets - 9.7:1
Flat top pistons / CNC 243's / LS9 gaskets - 10.25:1
Old timer is correct in that the TVS2300 will only move so much air before turning into a heat pump, if you want to squeeze every last bit out of it then go higher on the base compression but make sure your tuner is competent because not even forged pistons will save you from bad gas and detonation.
Good luck with your build.
OP: Keep the compression in the 9.7-10.25:1 range and you'll be money, the 2300 won't care about .5 points of compression.
Confirmed with a local gent here who runs the TVS2300 on a SBE LS1 w/ stock 317's, LS9 gaskets and a small cam makes about 560whp through a T56 on pump 91, he just keeps the timing a little low in the lower rpm range to save the stock rods plus its DD for him so he isn't pushing it too hard.
If you order the Summit pistons and rods, either combination will work very well, don't think if you go to 317's that the car will be a pig or something because it won't.
Flat top pistons / CNC 317's / LS9 gaskets - 9.7:1
Flat top pistons / CNC 243's / LS9 gaskets - 10.25:1
Old timer is correct in that the TVS2300 will only move so much air before turning into a heat pump, if you want to squeeze every last bit out of it then go higher on the base compression but make sure your tuner is competent because not even forged pistons will save you from bad gas and detonation.
Good luck with your build.
