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Old Nov 16, 2018 | 11:51 AM
  #21  
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https://ls1tech.com/forums/dynamomet...317-s-cam.html
came across this thread that was mentioned above, any thoughts? i realize this is an LQ9 but how realistic are these numbers?
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Old Nov 16, 2018 | 12:13 PM
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Originally Posted by 70_velle
https://ls1tech.com/forums/dynamomet...317-s-cam.html
came across this thread that was mentioned above, any thoughts? i realize this is an LQ9 but how realistic are these numbers?
That was a neat deal. 477 std. is realistic for the work he did. 250 duration 105 LSA cam designed for single plane use. Heads milled .100 and corrected intake face so decks were a little thin but held up to nitrous. I'd estimate 60cc 11.5:1 when it was done and no problem with 93 octane. Flycut pistons. 5300 converter.
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Old Nov 16, 2018 | 03:39 PM
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would i be able to get similar results with something like an LS3 or LS6 intake?
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Old Nov 16, 2018 | 04:02 PM
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Originally Posted by 70_velle
would i be able to get similar results with something like an LS3 or LS6 intake?
The ls3 intake only fits a rectangle port head. With your Lq4 , you will probably want a Dorman ls2 intake. It does require a bit of work with a truck accessory drive to make the throttle body fit. Brackets are available to do this from Ict billet for instance. 477 is a real stretch and a very dedicated drag race build. So what are you looking for in idle quality and the rpm you want to turn? How will the car be used? Are you looking to bolt it together, or are you willing to get pretty deep into machining things. The budget and your ability to do your own work plays into it.

$1000 gets you cam and valve train and the next 5% hp will cost you another $1000 and quite a bit more effort.
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Old Nov 16, 2018 | 04:21 PM
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the car is a street/strip car it does some highway cruising and goes to the track once a month or so. id rather just be able to get a cam and an intake to bolt on but id be ok doing some work to the current heads. but if that isnt enough for around 450rwhp im open to some different heads
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Old Nov 16, 2018 | 04:58 PM
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Originally Posted by 70_velle
the car is a street/strip car it does some highway cruising and goes to the track once a month or so. id rather just be able to get a cam and an intake to bolt on but id be ok doing some work to the current heads. but if that isnt enough for around 450rwhp im open to some different heads
Using the Pro Ls stage 3 412 whp unlocked converter number just as a basis; the next place to spend money is heads. The Tfs220 Heads get you the compression and flow and already have the spring pack you need with the Stage 3 cam so you can save that money. You will hit your 450 and closer to 475 number easily without machining. It will have good bottom end and will make your tuners job easy. Also fun to drive with 400 ft/lbs + starting at 3500 rpm

Last edited by Summitracing; Nov 16, 2018 at 06:04 PM.
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Old Nov 16, 2018 | 06:28 PM
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Originally Posted by Summitracing


Using the Pro Ls stage 3 412 whp unlocked converter number just as a basis; the next place to spend money is heads. The Tfs220 Heads get you the compression and flow and already have the spring pack you need with the Stage 3 cam so you can save that money. You will hit your 450 and closer to 475 number easily without machining. It will have good bottom end and will make your tuners job easy. Also fun to drive with 400 ft/lbs + starting at 3500 rpm
is there a way I can get close to that without aftermarket heads?
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Old Nov 16, 2018 | 06:37 PM
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Get the Stage 2.5 port job from TSP. Good quality job at a great price.
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Old Nov 16, 2018 | 06:40 PM
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Not really. The big 317 chambers could be milled .030 and still fit pretty easily. That will help, but compression only jumps a little. The heads are still stock and don’t flow welll. If you mill .030 and swap the spring pack, you are realistically looking at 420. That being said, if you’ve never experienced 420whp, that will make your Chevelle really scoot and you can always add heads later and sell your old 317’s with spring packs to a turbo guy.

Last edited by Summitracing; Nov 16, 2018 at 07:03 PM.
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Old Nov 16, 2018 | 06:42 PM
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Originally Posted by G Atsma
Get the Stage 2.5 port job from TSP. Good quality job at a great price.
Agreed this is a good mid-range deal along with work by Total Engine Airflow. Our main point is the 5cc smaller chamber even before milling will help you get to your goal quicker.
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Old Nov 16, 2018 | 08:15 PM
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Originally Posted by Summitracing

Agreed this is a good mid-range deal along with work by Total Engine Airflow. Our main point is the 5cc smaller chamber even before milling will help you get to your goal quicker.
Right. TEA is good too, I'm just more familiar with TSP. They're both very good!
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