1.6 roller rockers question
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Joined: Apr 2019
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From: Bay area
1.6 roller rockers question So I'm about to install some 1.6 comp cam magnum pro roller rockers. Self align.
And currently running some 1.52 roller rocker that I installed a while back, when I did my cam swap.
My question is what will be the difference between the 1.52 & 1.6?
Whats the hp gains & will the exhaust tone change?
I have supporting mods already like intake, headers, valvetrain Mods, tune, cam etc
The cam im running is a 502 comp cam 218/224 durations with. 495/503 lift and 112 ls
And currently running some 1.52 roller rocker that I installed a while back, when I did my cam swap.
My question is what will be the difference between the 1.52 & 1.6?
Whats the hp gains & will the exhaust tone change?
I have supporting mods already like intake, headers, valvetrain Mods, tune, cam etc
The cam im running is a 502 comp cam 218/224 durations with. 495/503 lift and 112 ls
Last edited by LT1DG; Aug 14, 2022 at 02:35 AM.
Launching!
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So I'm about to install some 1.6 comp cam magnum pro roller rockers.
And currently running some 1.52 roller rocker that I installed a while back, when I did my cam swap.
My question is what will be the difference between the 1.52 & 1.6?
Whats the hp gains & will the exhaust tone change?
I have supporting mods already like intake, headers, valvetrain. Mods, tune, cam etc
The cam im running is a 502 comp cam 218/224 durations with. 495/503 lift and 112 ls
And currently running some 1.52 roller rocker that I installed a while back, when I did my cam swap.
My question is what will be the difference between the 1.52 & 1.6?
Whats the hp gains & will the exhaust tone change?
I have supporting mods already like intake, headers, valvetrain. Mods, tune, cam etc
The cam im running is a 502 comp cam 218/224 durations with. 495/503 lift and 112 ls
Thread Starter
Launching!
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From: Bay area
Some has said that there exhaust tone slightly changed when they upgraded to 1.6, why is that?
Launching!
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Last edited by Fast355; Aug 15, 2022 at 09:00 AM.
Thread Starter
Launching!
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From: Bay area
Because you are making the whole love of the cam larger. It bleeds off the exhaust pressure earlier when it still has more exhaust energy. On my 383 with a Comp custom grind that had too much exhaust duration (Comp told my my intended grind was way wrong and pressured me to a dual pattern grind with a 10° split and a wider LSA when I knew I wanted and needed a single pattern on a tighter LSA), I just went from a 1.7 exhaust rocker to a 1.5 exhaust rocker and gained a good bit of low-speed torque without killing any power up top.
What are the other benefits fron this mod? Heat, I assume temp will be kinda cooler.
Last edited by LT1DG; Aug 15, 2022 at 09:51 AM.
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From: Kernersville, NC
I'm pretty sure just roller rockers will not give you any chop to the idle if you don't already have it. You have to change the cam for that. For hp numbers, you might pick up around 10-15hp depending on the mods.
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Thread Starter
Launching!
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From: Bay area
Maybe on a stock cam, it will be a little bit noticeable.
Will the motor be noisy with the 1.6?
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Verdad Gallardo TECH Resident
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From: Kernersville, NC
I have the NSA 1.6 pro mags with my CC503. They sound like a bunch of sewing machines when the hood is lifted. I'm not sure how the self-aligning ones will sound. You can hear what my Z28 sounds like here.....
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Launching!
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From: Bay area
I have the NSA 1.6 pro mags with my CC503. They sound like a bunch of sewing machines when the hood is lifted. I'm not sure how the self-aligning ones will sound. You can hear what my Z28 sounds like here.....
https://www.youtube.com/watch?v=5K5G2VkoiCs
https://www.youtube.com/watch?v=5K5G2VkoiCs
Thread Starter
Launching!
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From: Bay area
I should of done this long time ago when I cam swap it. I don't know why I got the 1.52 lol. What was I thinking.
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From: Euless, TX
I have the NSA 1.6 pro mags with my CC503. They sound like a bunch of sewing machines when the hood is lifted. I'm not sure how the self-aligning ones will sound. You can hear what my Z28 sounds like here.....
https://www.youtube.com/watch?v=5K5G2VkoiCs
https://www.youtube.com/watch?v=5K5G2VkoiCs
First startup, open header and still had tuning to do.
Running 3" open cutouts.
With the cutouts closed and the exhaust routed into the quiet walker ultraquiet muffler the sewing machine noise is much more noticeable. With the insulated engine cover in place you do not hear it inside. Unlike my cammed 5.7L Hemi that you could hear the valvetrain at 60 mph inside the truck.
The 218/228 cam with Rhoads V-Max lifters is barely noticeable with a quiet muffler in an 11:1 383.
I need to open up the base air rate screw on the BBK throttle body and possibly port the IAC passageways on it. The most noticeable thing is the IAC hiss especially with the ac on. Its at 60-65 iac counts at warm idle with no load on the engine. It gets amplified by the 4" air intake and custom K&N setup. When the iac opens for throttle follower function you can hear the hiss even driving down the road. When I had the IAC wide open at 310 counts doing this ac performance test at 1,150 rpm, the iac was loud.
Last edited by Fast355; Aug 17, 2022 at 09:52 PM.
Thread Starter
Launching!
Joined: Apr 2019
Posts: 206
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From: Bay area
I have a similar sound with my Scorpion non self aligning 1.7s and now 1.7 Intake/1.5 Exhaust combination. I have a comp 218/228 @ 0.050 on a 108 LSA cam and Rhoads V-Max lifters. I think some of the noise is the hardened pushrods banging around on the hardened guide plates.
First startup, open header and still had tuning to do.
https://youtu.be/FzEDpuSIwJc
Running 3" open cutouts.
https://youtu.be/1xXFPoS3Y2Y
With the cutouts closed and the exhaust routed into the quiet walker ultraquiet muffler the sewing machine noise is much more noticeable. With the insulated engine cover in place you do not hear it inside. Unlike my cammed 5.7L Hemi that you could hear the valvetrain at 60 mph inside the truck.
https://youtu.be/zJBiw3xkiYY
The 218/228 cam with Rhoads V-Max lifters is barely noticeable with a quiet muffler in an 11:1 383.
https://youtube.com/shorts/T29nCd8sifQ?feature=share
I need to open up the base air rate screw on the BBK throttle body and possibly port the IAC passageways on it. The most noticeable thing is the IAC hiss especially with the ac on. Its at 60-65 iac counts at warm idle with no load on the engine. It gets amplified by the 4" air intake and custom K&N setup. When the iac opens for throttle follower function you can hear the hiss even driving down the road. When I had the IAC wide open at 310 counts doing this ac performance test at 1,150 rpm, the iac was loud.
https://youtube.com/shorts/4Ok9s8cMM2Y?feature=share
First startup, open header and still had tuning to do.
https://youtu.be/FzEDpuSIwJc
Running 3" open cutouts.
https://youtu.be/1xXFPoS3Y2Y
With the cutouts closed and the exhaust routed into the quiet walker ultraquiet muffler the sewing machine noise is much more noticeable. With the insulated engine cover in place you do not hear it inside. Unlike my cammed 5.7L Hemi that you could hear the valvetrain at 60 mph inside the truck.
https://youtu.be/zJBiw3xkiYY
The 218/228 cam with Rhoads V-Max lifters is barely noticeable with a quiet muffler in an 11:1 383.
https://youtube.com/shorts/T29nCd8sifQ?feature=share
I need to open up the base air rate screw on the BBK throttle body and possibly port the IAC passageways on it. The most noticeable thing is the IAC hiss especially with the ac on. Its at 60-65 iac counts at warm idle with no load on the engine. It gets amplified by the 4" air intake and custom K&N setup. When the iac opens for throttle follower function you can hear the hiss even driving down the road. When I had the IAC wide open at 310 counts doing this ac performance test at 1,150 rpm, the iac was loud.
https://youtube.com/shorts/4Ok9s8cMM2Y?feature=share
I can kinda hear my iac at idle. That thing sounds good btw
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