I'm checking out a CVO ST 135"
Seasoned HDF Member
Joined: Jan 2007
Posts: 5,630
Likes: 4,096
From: Virginia
Dont know about the kit but the CNC manifold is stock on the 135 crate motor.
At the time, when I did my SE 121-135 Stage IV Kit, my Technician recommended the additional purchase of the 68mm manifold from the P&A Catalog. Im assuming my manifold was CNCd to match the ports on the heads.
Now, a 68mm manifold is included in the kit but it sounds like you are saying that manifold is not CNCd to match the ports in the heads?
That being said, it sounds like an additional purchase would still be required if someone wanted the CNC manifold.
That doesnt make any sense!
Why would the MoCo make two different 68mm manifolds?
Would the MoCo really do that?
I know their R&D is following the factory race team, but would there be that much difference in performance?
Now, a 68mm manifold is included in the kit but it sounds like you are saying that manifold is not CNCd to match the ports in the heads?
That being said, it sounds like an additional purchase would still be required if someone wanted the CNC manifold.
That doesnt make any sense!
Why would the MoCo make two different 68mm manifolds?
Would the MoCo really do that?
I know their R&D is following the factory race team, but would there be that much difference in performance?
Road Master
Joined: Jan 2012
Posts: 897
Likes: 307
From: se wi
Dont you love the games dealers play at times? Hopefully they get it soon and you can take it home, sounds like it would be a fun bike to ride.
Supporter
Joined: Jun 2014
Posts: 439
Likes: 483
From: Montana
Anyway, Im excited and happy for you!
Youre going to love the ride!
The power band is so wide its happy in just about any gear.
Thread Starter
|
Stellar HDF Member
Joined: Apr 2011
Posts: 2,446
Likes: 1,553
From: Central Wisconsin
They must not make a SE Stage IV badge for the stock intake. I cannot find one. I'm not sure if I will swap the a/c out yet or not. It has the badge on the cam cover and the the derby cover, but not the intake.
Stellar HDF Member
Joined: Jul 2013
Posts: 2,341
Likes: 982
From: Trinity NC
Below are the differences listed in the HD parts catalog for the crate vs kit.
The 135ci Crate engine consists of: All-new Screamin' EagleŽ Extreme CNC-ported cylinder heads, new SE8-550 high-lift cam, new high-compression forged pistons, 68mm throttle body and new CNC-machined Extreme Flow 68mm intake manifold
The Stage IV kit consists of: All-new Screamin' EagleŽ Extreme CNC-ported cylinder heads, 68mm throttle body and new cast 68mm intake manifold, new SE8-550 high-lift cam and 6.8 g/sec fuel injectors work together to feed the engine large volumes of air and fuel to help maximize power
The 135ci Crate engine consists of: All-new Screamin' EagleŽ Extreme CNC-ported cylinder heads, new SE8-550 high-lift cam, new high-compression forged pistons, 68mm throttle body and new CNC-machined Extreme Flow 68mm intake manifold
The Stage IV kit consists of: All-new Screamin' EagleŽ Extreme CNC-ported cylinder heads, 68mm throttle body and new cast 68mm intake manifold, new SE8-550 high-lift cam and 6.8 g/sec fuel injectors work together to feed the engine large volumes of air and fuel to help maximize power
Stellar HDF Member
Joined: Jul 2013
Posts: 2,341
Likes: 982
From: Trinity NC
From the way you described the bike and upgrades it will be worth the wait. GL with your purchase!
Last edited by Mofo67; Sep 12, 2025 at 04:41 AM.
Supporter
Joined: Jun 2014
Posts: 439
Likes: 483
From: Montana
The Stage IV kit consists of: All-new Screamin' EagleŽ Extreme CNC-ported cylinder heads, 68mm throttle body and new cast 68mm intake manifold, new SE8-550 high-lift cam and 6.8 g/sec fuel injectors work together to feed the engine large volumes of air and fuel to help maximize power
Thanks for the research!
Glad my Technician recommended the upgrade.
Mine was an early kit they had on hand in 2024, and it seems like that kit included a 65mm manifold.
Im on a trip right now riding the Lolo Pass & Trail, when I get home Ill check the P/Ns installed.
My technician probably included the manifold that came in the kit with my take offs.
Its really just a mute point for me since Ive got good numbers and the bike rips!
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Times Harley-Davidson Chucked Tradition Out the Window
Verdad Gallardo
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
Seasoned HDF Member
Joined: Jan 2007
Posts: 5,630
Likes: 4,096
From: Virginia
"It’s really just a mute point for me since I’ve got good numbers and the bike rips!"
As a life long rider, I learned a long time ago chasing numbers and dyno sheets is a fool's game. Your butt is the best judgeof if your bike's performance is satisfactory or not. Leave it at that.
As a life long rider, I learned a long time ago chasing numbers and dyno sheets is a fool's game. Your butt is the best judgeof if your bike's performance is satisfactory or not. Leave it at that.
