Intake manifold for H/C c5
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
Intake manifold for H/C c5
hi guys, I have a 2001 automatic with 3.15 rear end paired with a 3400 stall tc. I am running speed engineering headers with a TSP TV2 cam on a 112 LSA. i am looking at purchasing a set of cylinder heads within the next few weeks (most likely PRC 225) and am wondering what intake manifold would be best for my set up. since my converter is stalled to 3400 I am mainly looking for mid-high end power since the low end is hardly used. I’m mainly considering a Holley hi-ram or a FAST LSXR 102. any help would be appreciated!
Tech Contributor
Joined: Jan 2007
Posts: 19,292
Likes: 1,109
From: Dyer, IN
hi guys, I have a 2001 automatic with 3.15 rear end paired with a 3400 stall tc. I am running speed engineering headers with a TSP TV2 cam on a 112 LSA. i am looking at purchasing a set of cylinder heads within the next few weeks (most likely PRC 225) and am wondering what intake manifold would be best for my set up. since my converter is stalled to 3400 I am mainly looking for mid-high end power since the low end is hardly used. I’m mainly considering a Holley hi-ram or a FAST LSXR 102. any help would be appreciated!
I do have a question though....how do you avoid using "low end" power?
Racer
Joined: Jun 2007
Posts: 304
Likes: 20
From: Massachusetts
Your already have a great intake manifold. If I remember correctly...when the FAST 102 first came out, the dyno results v/s and LS6 intake on a Heads/Cam/Headers car was 20-25 HP for a $1500 investment....not including the throttle body. .....and it does not fit without shimming the cradle or modifying the cowl. Now, if you are building a 1000 HP LSX monster.....rock on
I do have a question though....how do you avoid using "low end" power?
I do have a question though....how do you avoid using "low end" power?
I agree 1000% Richard Holdener has done a ton of dyno videos on intakes and the LS6 intake is the one to have until you get to crazy power levels. It is not worth the money IMHO. I also feel the same about the stock 78mm TB but my opinions on that seem to be less popular.
Melting Slicks
Joined: Aug 2007
Posts: 2,583
Likes: 415
From: Erwin, NC
Your cam is good to 7k RPM. A stock/ported LS6 intake or a FAST 92 (used) is all you need. The FAST 102 is too big for your current setup. You would have to put it on a big cube engine or run it to a MUCH higher RPM to see worthwhile gains.
Don't quote me on this, but I believe the 102 is a multi-piece intake, so it isn't good for forced induction either. The LS6 intake is a single piece.
Just so you don't think I'm pulling this out of my ***, here are the specs for when I was N/A and shifting at 7k RPM.
231/237 .589/.595 112 LSA
Patriot Stage 2 heads (59cc)
Fast 92 intake/Ported LS2 TB/Blackwing
Kooks LTs/Kooks ORx open
DTE Brace
LS7 clutch/LS2 Flywheel/C6Z shifter
3.73 gears
Don't quote me on this, but I believe the 102 is a multi-piece intake, so it isn't good for forced induction either. The LS6 intake is a single piece.
Just so you don't think I'm pulling this out of my ***, here are the specs for when I was N/A and shifting at 7k RPM.
231/237 .589/.595 112 LSA
Patriot Stage 2 heads (59cc)
Fast 92 intake/Ported LS2 TB/Blackwing
Kooks LTs/Kooks ORx open
DTE Brace
LS7 clutch/LS2 Flywheel/C6Z shifter
3.73 gears
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
Your already have a great intake manifold. If I remember correctly...when the FAST 102 first came out, the dyno results v/s and LS6 intake on a Heads/Cam/Headers car was 20-25 HP for a $1500 investment....not including the throttle body. .....and it does not fit without shimming the cradle or modifying the cowl. Now, if you are building a 1000 HP LSX monster.....rock on
I do have a question though....how do you avoid using "low end" power?
I do have a question though....how do you avoid using "low end" power?
Drifting
Joined: Jul 2004
Posts: 1,639
Likes: 659
From: Pingree Grove IL
With a heads and cam automatic car, you pretty much have to do the intake manifold to get over 400 wheel horsepower. Fast intake manifold has my vote, I’ve heard you can’t buy them new anymore. PRC 225 heads might require a large cam, stage 3 or larger. I might go to an AFR 205 head. For tuning purposes, I think the LS2 silver blade TB is one of the best, again, not sure if you can get one new. 3400 converter should be more then enough with the cam choice.
IMO, next time, just rebuild the entire top end and be done with it, pull the block, do oil pan gaskets and oil pump.
IMO, next time, just rebuild the entire top end and be done with it, pull the block, do oil pan gaskets and oil pump.
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
With a heads and cam automatic car, you pretty much have to do the intake manifold to get over 400 wheel horsepower. Fast intake manifold has my vote, I’ve heard you can’t buy them new anymore. PRC 225 heads might require a large cam, stage 3 or larger. I might go to an AFR 205 head. For tuning purposes, I think the LS2 silver blade TB is one of the best, again, not sure if you can get one new. 3400 converter should be more then enough with the cam choice.
IMO, next time, just rebuild the entire top end and be done with it, pull the block, do oil pan gaskets and oil pump.
IMO, next time, just rebuild the entire top end and be done with it, pull the block, do oil pan gaskets and oil pump.
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
Your cam is good to 7k RPM. A stock/ported LS6 intake or a FAST 92 (used) is all you need. The FAST 102 is too big for your current setup. You would have to put it on a big cube engine or run it to a MUCH higher RPM to see worthwhile gains.
Don't quote me on this, but I believe the 102 is a multi-piece intake, so it isn't good for forced induction either. The LS6 intake is a single piece.
Just so you don't think I'm pulling this out of my ***, here are the specs for when I was N/A and shifting at 7k RPM.
231/237 .589/.595 112 LSA
Patriot Stage 2 heads (59cc)
Fast 92 intake/Ported LS2 TB/Blackwing
Kooks LTs/Kooks ORx open
DTE Brace
LS7 clutch/LS2 Flywheel/C6Z shifter
3.73 gears
Don't quote me on this, but I believe the 102 is a multi-piece intake, so it isn't good for forced induction either. The LS6 intake is a single piece.
Just so you don't think I'm pulling this out of my ***, here are the specs for when I was N/A and shifting at 7k RPM.
231/237 .589/.595 112 LSA
Patriot Stage 2 heads (59cc)
Fast 92 intake/Ported LS2 TB/Blackwing
Kooks LTs/Kooks ORx open
DTE Brace
LS7 clutch/LS2 Flywheel/C6Z shifter
3.73 gears
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Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
I agree 1000% Richard Holdener has done a ton of dyno videos on intakes and the LS6 intake is the one to have until you get to crazy power levels. It is not worth the money IMHO. I also feel the same about the stock 78mm TB but my opinions on that seem to be less popular.
Drifting
Joined: Jul 2004
Posts: 1,639
Likes: 659
From: Pingree Grove IL
Last edited by Beast; Aug 13, 2025 at 02:41 PM.
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
you want 440 wheel horsepower on an automatic car. How big is that cam? Big cam, the PRC 225 heads and the fast intake people are talking about, might get you to 440 wheel, I’m not sure. And with a big cam, you might want to change out the 3.15 gears. @RonSSNova might have some great advice for you. According to my knowledge he runs a 226/230 cam, not sure about the lift, and he’s done low 11’s, maybe even a high 10???
Safety Car
Joined: Aug 2011
Posts: 4,436
Likes: 404
From: Portland OR
I have AFR 205 Mongoose heads from way back. Still a great head. Bought them used here. They were milled to 58cc. So 11.4:1 CR
Also have the fast 102, LS2TB, LS2 injectors. Bought that all used here as well.
Mine is a 2000 coupe, so didn't have the better intake.
Anyway, it made 443 on a Dyno Dynamics dyno with the converter locked. -25 hp unlocked. I'll let you guys look up the diff between this dyno and the DynoJet.
I was the dyno operator and tuner BTY. I did that for about 5 years, mostly Mopars.
Cam is indeed 226/230 .600 114. Custom EPS grind.
On a cool night with good traction it ran 10.99 @ 123. Typically ran 11.0's. All depends on the weather.
Also have the fast 102, LS2TB, LS2 injectors. Bought that all used here as well.
Mine is a 2000 coupe, so didn't have the better intake.
Anyway, it made 443 on a Dyno Dynamics dyno with the converter locked. -25 hp unlocked. I'll let you guys look up the diff between this dyno and the DynoJet.
I was the dyno operator and tuner BTY. I did that for about 5 years, mostly Mopars.
Cam is indeed 226/230 .600 114. Custom EPS grind.
On a cool night with good traction it ran 10.99 @ 123. Typically ran 11.0's. All depends on the weather.
Melting Slicks
Joined: Aug 2007
Posts: 2,583
Likes: 415
From: Erwin, NC
I have AFR 205 Mongoose heads from way back. Still a great head. Bought them used here. They were milled to 58cc. So 11.4:1 CR
Also have the fast 102, LS2TB, LS2 injectors. Bought that all used here as well.
Mine is a 2000 coupe, so didn't have the better intake.
Anyway, it made 443 on a Dyno Dynamics dyno with the converter locked. -25 hp unlocked. I'll let you guys look up the diff between this dyno and the DynoJet.
I was the dyno operator and tuner BTY. I did that for about 5 years, mostly Mopars.
Cam is indeed 226/230 .600 114. Custom EPS grind.
On a cool night with good traction it ran 10.99 @ 123. Typically ran 11.0's. All depends on the weather.
Also have the fast 102, LS2TB, LS2 injectors. Bought that all used here as well.
Mine is a 2000 coupe, so didn't have the better intake.
Anyway, it made 443 on a Dyno Dynamics dyno with the converter locked. -25 hp unlocked. I'll let you guys look up the diff between this dyno and the DynoJet.
I was the dyno operator and tuner BTY. I did that for about 5 years, mostly Mopars.
Cam is indeed 226/230 .600 114. Custom EPS grind.
On a cool night with good traction it ran 10.99 @ 123. Typically ran 11.0's. All depends on the weather.
Drifting
Joined: Jul 2004
Posts: 1,639
Likes: 659
From: Pingree Grove IL