Cam Recommendations, Iron 383
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Cam Recommendations, Iron 383 Hello all,
Just picked up a LM7 block-based forged 383 (4” x 3.905”, 6.125 rods), looking for cam suggestions. Specs as follows:
6cc dish pistons
PRC 2.5 706s = 11.2:1 SCR
1.75 LTs
Holley MPFI single plane
Holley Term X
Dual 2.5 exhaust w/x-pipe
TR6060 Magnum
4.10 gears w/29” tall tires
~3,500lb total vehicle weight
I want driveability like the LS3/TR6060 in my 2017 SS sedan, but with more “under the curve” power for street funsies, spinning the motor to around 6,500 rpm. Little to no intent to drag, road course, or auto-x, just blasting around back roads and cruising. HP goal, if it puts 450 on the ground, cool. Anything more is icing on the cake. Quiet valvetrain is a bonus.
Cam motion suggested the “Stealthy Stroker” (233/240, 117 LCA, 112 ICL, .621"/.604").
It gets me to 8.3 DCR, which is good for 93 pump, but I think this cam will push the power band pretty high in the rev range and possibly have more idle/low speed driveability concerns than what I want.
Thoughts/recommendations from the experts here? Thanks in advance!
Just picked up a LM7 block-based forged 383 (4” x 3.905”, 6.125 rods), looking for cam suggestions. Specs as follows:
6cc dish pistons
PRC 2.5 706s = 11.2:1 SCR
1.75 LTs
Holley MPFI single plane
Holley Term X
Dual 2.5 exhaust w/x-pipe
TR6060 Magnum
4.10 gears w/29” tall tires
~3,500lb total vehicle weight
I want driveability like the LS3/TR6060 in my 2017 SS sedan, but with more “under the curve” power for street funsies, spinning the motor to around 6,500 rpm. Little to no intent to drag, road course, or auto-x, just blasting around back roads and cruising. HP goal, if it puts 450 on the ground, cool. Anything more is icing on the cake. Quiet valvetrain is a bonus.
Cam motion suggested the “Stealthy Stroker” (233/240, 117 LCA, 112 ICL, .621"/.604").
It gets me to 8.3 DCR, which is good for 93 pump, but I think this cam will push the power band pretty high in the rev range and possibly have more idle/low speed driveability concerns than what I want.
Thoughts/recommendations from the experts here? Thanks in advance!
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From: Mississippi
That intake is not good for under the curve performance like you mentioned. I would look into a dorman intake or a fast intake. The intake you have now dont really start coming on until 4500 or so rpm i would bet money on it.
100% agree if it something like the Victor Jr. Is your single plane something like this? This one states 2500-7000 rpm
https://www.summitracing.com/parts/h...hoCitgQAvD_BwE
https://www.summitracing.com/parts/h...hoCitgQAvD_BwE
Thread Starter
Teching In
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The intake has the “look” I’m going for though, as the motor is dressed like an old orange small block—itsa 1970 C10. I am strongly considering a TBSS/NNBS intake and just keeping the hood closed…
100% agree if it something like the Victor Jr. Is your single plane something like this? This one states 2500-7000 rpm
https://www.summitracing.com/parts/h...hoCitgQAvD_BwE
https://www.summitracing.com/parts/h...hoCitgQAvD_BwE
https://www.holley.com/products/engine/intake_manifolds/efi_intake_manifolds/cast/single_plane/parts/300-136
Hoping the 4” stroke can make up for some of the misgivings of the pretty intake. Thinking a fairly mild cam might be enough to make up for it?
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From: Mississippi
The answer is yes and no. Stroke adds torque and thats a fact however its all in the combo. That intake is your enemy.
With a deep breath the 383ci LS platform is not easy to cam etc . Most fall short of 430 rwhp. However, i do have a PROVEN COMBO in my notes for a 383ci that makes 460 plus rear wheel combo with a single pattern duration cam. I can dig that up if you are interested.
With a deep breath the 383ci LS platform is not easy to cam etc . Most fall short of 430 rwhp. However, i do have a PROVEN COMBO in my notes for a 383ci that makes 460 plus rear wheel combo with a single pattern duration cam. I can dig that up if you are interested.
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Teching In
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The answer is yes and no. Stroke adds torque and thats a fact however its all in the combo. That intake is your enemy.
With a deep breath the 383ci LS platform is not easy to cam etc . Most fall short of 430 rwhp. However, i do have a PROVEN COMBO in my notes for a 383ci that makes 460 plus rear wheel combo with a single pattern duration cam. I can dig that up if you are interested.
With a deep breath the 383ci LS platform is not easy to cam etc . Most fall short of 430 rwhp. However, i do have a PROVEN COMBO in my notes for a 383ci that makes 460 plus rear wheel combo with a single pattern duration cam. I can dig that up if you are interested.
@Tuskyz28 Definitely interested. I’d like to see it if you don’t mind sharing. No sense putting this engine in the truck and not maximizing its potential.
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From: Mississippi
383ci
229/229 duration 578/578lift cam
TEA LS6 2.5 heads
1 7/8 headers
Ported LS6 90mm intake
11.3 compression
wiseco pistons
465rwhp
Thats a proven combo. Im go say its more power in that combo above thats left on the table.
Contact Martin Smallwood for a cam ive seen one of his cammed 383ci make over 490 rwhp with PRC heads. Cam was like a 235/239 duration camshaft. Hope this helps.
229/229 duration 578/578lift cam
TEA LS6 2.5 heads
1 7/8 headers
Ported LS6 90mm intake
11.3 compression
wiseco pistons
465rwhp
Thats a proven combo. Im go say its more power in that combo above thats left on the table.
Contact Martin Smallwood for a cam ive seen one of his cammed 383ci make over 490 rwhp with PRC heads. Cam was like a 235/239 duration camshaft. Hope this helps.
Before you go dumping tons of $$$ one way or the other on the build, try some things first. If it were my build, I would keep the single plane, go bigger on the cam, bigger on the exhaust and slap a high quality 4000rpm converter in it. 383's need a lot of flow, most fall on their face, as do most strikers. I think the camming is off on the vast majority of them, also not enough intake volume as when that longer stroke comes down, the plenum volume needs to be there to support it. You have the single plane, run it first and see what it does Don't cheat on the throttle body either, go big. If you do swap intakes, I would spend the $$$ and do the LSXRT or LSXHR and port it. The biggest problem I see off the bat is the exhaust, that 2.5 isn't going to cut it. 3in min, maybe 3.5 even.
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Dave- the op is running a stick shift tranmission. No 4000 stall for him.
If he decide to keep the intake i would go with a cam on a 110 LSA to 111 MAX to pull as much power under the curve as possible. My LS2 build showed BIG TIME how LSA plays a major role under the curve. ZZracer proved that on his dyno first hand with two cars basically set up the same but on a different LSA. I would be even willing to go 110+2 on this combo for the op.
If he decide to keep the intake i would go with a cam on a 110 LSA to 111 MAX to pull as much power under the curve as possible. My LS2 build showed BIG TIME how LSA plays a major role under the curve. ZZracer proved that on his dyno first hand with two cars basically set up the same but on a different LSA. I would be even willing to go 110+2 on this combo for the op.
Dave- the op is running a stick shift tranmission. No 4000 stall for him.
If he decide to keep the intake i would go with a cam on a 110 LSA to 111 MAX to pull as much power under the curve as possible. My LS2 build showed BIG TIME how LSA plays a major role under the curve. ZZracer proved that on his dyno first hand with two cars basically set up the same but on a different LSA. I would be even willing to go 110+2 on this combo for the op.
If he decide to keep the intake i would go with a cam on a 110 LSA to 111 MAX to pull as much power under the curve as possible. My LS2 build showed BIG TIME how LSA plays a major role under the curve. ZZracer proved that on his dyno first hand with two cars basically set up the same but on a different LSA. I would be even willing to go 110+2 on this combo for the op.
BTW, not related to this, but I scored a set of AFR 205 heads and a similar cam to yours. Both are going on my TBSS LS2 and I am fgoing to port a TBSS intake for now. Will see how it does.
Last edited by DualQuadDave; Dec 11, 2024 at 10:06 PM.
Thread Starter
Teching In
Joined: Nov 2024
Posts: 15
Likes: 10
383ci
229/229 duration 578/578lift cam
TEA LS6 2.5 heads
1 7/8 headers
Ported LS6 90mm intake
11.3 compression
wiseco pistons
465rwhp
Thats a proven combo. Im go say its more power in that combo above thats left on the table.
Contact Martin Smallwood for a cam ive seen one of his cammed 383ci make over 490 rwhp with PRC heads. Cam was like a 235/239 duration camshaft. Hope this helps.
229/229 duration 578/578lift cam
TEA LS6 2.5 heads
1 7/8 headers
Ported LS6 90mm intake
11.3 compression
wiseco pistons
465rwhp
Thats a proven combo. Im go say its more power in that combo above thats left on the table.
Contact Martin Smallwood for a cam ive seen one of his cammed 383ci make over 490 rwhp with PRC heads. Cam was like a 235/239 duration camshaft. Hope this helps.
Before you go dumping tons of $$$ one way or the other on the build, try some things first. If it were my build, I would keep the single plane, go bigger on the cam, bigger on the exhaust and slap a high quality 4000rpm converter in it. 383's need a lot of flow, most fall on their face, as do most strikers. I think the camming is off on the vast majority of them, also not enough intake volume as when that longer stroke comes down, the plenum volume needs to be there to support it. You have the single plane, run it first and see what it does Don't cheat on the throttle body either, go big. If you do swap intakes, I would spend the $$$ and do the LSXRT or LSXHR and port it. The biggest problem I see off the bat is the exhaust, that 2.5 isn't going to cut it. 3in min, maybe 3.5 even.
Dave- the op is running a stick shift tranmission. No 4000 stall for him.
If he decide to keep the intake i would go with a cam on a 110 LSA to 111 MAX to pull as much power under the curve as possible. My LS2 build showed BIG TIME how LSA plays a major role under the curve. ZZracer proved that on his dyno first hand with two cars basically set up the same but on a different LSA. I would be even willing to go 110+2 on this combo for the op.
If he decide to keep the intake i would go with a cam on a 110 LSA to 111 MAX to pull as much power under the curve as possible. My LS2 build showed BIG TIME how LSA plays a major role under the curve. ZZracer proved that on his dyno first hand with two cars basically set up the same but on a different LSA. I would be even willing to go 110+2 on this combo for the op.
Ok, I see what you are trying to do. Here is my recipe, go with the Cam Motion cam or, my preference, 235/239 112+4. Both will make good power, but the 235/239 will kill it on overall powerband torque. You can tune driveability into both, it's all in the tune. Question, send me more info on the throttle body(part number) and what single plane intake do you have exactly? Port work can make it better, usually. Don't be afraid of getting the cam right. Overlap will make torque and make it fun.
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Posts: 418
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From: Franconia, PA
You guys are reinforcing what I was already thinking. Bigger header primaries and a long runner intake.
@Tuskyz28 Definitely interested. I’d like to see it if you don’t mind sharing. No sense putting this engine in the truck and not maximizing its potential.
@Tuskyz28 Definitely interested. I’d like to see it if you don’t mind sharing. No sense putting this engine in the truck and not maximizing its potential.
https://ls1tech.com/forums/dynamomet...o-results.html
like others said, ditch that intake. Tbss or fast 102.
TECH Veteran
Joined: Sep 2014
Posts: 4,893
Likes: 703
From: Mississippi
check this link out. I love the summit 8710s specs. 230/242, .625, .605, 113+3. This car makes over 400tq from about 2700k rpms to 6200. The numbers are with STD correction, so figure 470whp/450wtq with SAE. Very stout.
https://ls1tech.com/forums/dynamomet...o-results.html
like others said, ditch that intake. Tbss or fast 102.
https://ls1tech.com/forums/dynamomet...o-results.html
like others said, ditch that intake. Tbss or fast 102.
Abs- the LS3 combo you posted is good numbers but its a whole different animal. A 383ci LS motor doesnt have the bore size no where near a LS3 bore. I know a 376ci isnt far from a 383ci on paper UNTIL you factor in the STROKE and BORE of each setup. Totally the opposite. The op is limited on head selection , etc vs a LS3 combo due to his smaller bore
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Posts: 418
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From: Franconia, PA
zerofox-yes thats blackbird 383 combo.
Abs- the LS3 combo you posted is good numbers but its a whole different animal. A 383ci LS motor doesnt have the bore size no where near a LS3 bore. I know a 376ci isnt far from a 383ci on paper UNTIL you factor in the STROKE and BORE of each setup. Totally the opposite. The op is limited on head selection , etc vs a LS3 combo due to his smaller bore
Abs- the LS3 combo you posted is good numbers but its a whole different animal. A 383ci LS motor doesnt have the bore size no where near a LS3 bore. I know a 376ci isnt far from a 383ci on paper UNTIL you factor in the STROKE and BORE of each setup. Totally the opposite. The op is limited on head selection , etc vs a LS3 combo due to his smaller bore
TECH Regular
Joined: May 2023
Posts: 418
Likes: 139
From: Franconia, PA
383ci
229/229 duration 578/578lift cam
TEA LS6 2.5 heads
1 7/8 headers
Ported LS6 90mm intake
11.3 compression
wiseco pistons
465rwhp
Thats a proven combo. Im go say its more power in that combo above thats left on the table.
Contact Martin Smallwood for a cam ive seen one of his cammed 383ci make over 490 rwhp with PRC heads. Cam was like a 235/239 duration camshaft. Hope this helps.
229/229 duration 578/578lift cam
TEA LS6 2.5 heads
1 7/8 headers
Ported LS6 90mm intake
11.3 compression
wiseco pistons
465rwhp
Thats a proven combo. Im go say its more power in that combo above thats left on the table.
Contact Martin Smallwood for a cam ive seen one of his cammed 383ci make over 490 rwhp with PRC heads. Cam was like a 235/239 duration camshaft. Hope this helps.
