Mild Cam or Wait?
Dec 4, 2024 | 03:48 AM
#11
TECH Addict
Joined: Nov 2015
Posts: 2,084
Likes: 552
From: Coastal NC
completely depends... here's my blower cam with no overlap.
https://www.youtube.com/watch?v=xltlG9FOGgc
to an extent. for the most part, supercharging will 'enhance' the N/A power curve because it performs based on RPM. that said, i'd use cam specs to make up for deficiencies in the blowers' inherent design traits (e.g., run a higher-rpm stick with a PD blower because it makes plenty of off-idle torque but needs help up top... versus a centrifugal would benefit from a mid-RPM cam because it pushes lots of air up top but none down low). in both cases, zero or negative overlap will prevent bleeding off manifold pressure (wasting blower efficiency)... but having overlap ain't necessarily as detrimental as it would be with a turbo.
https://www.youtube.com/watch?v=xltlG9FOGgc
to an extent. for the most part, supercharging will 'enhance' the N/A power curve because it performs based on RPM. that said, i'd use cam specs to make up for deficiencies in the blowers' inherent design traits (e.g., run a higher-rpm stick with a PD blower because it makes plenty of off-idle torque but needs help up top... versus a centrifugal would benefit from a mid-RPM cam because it pushes lots of air up top but none down low). in both cases, zero or negative overlap will prevent bleeding off manifold pressure (wasting blower efficiency)... but having overlap ain't necessarily as detrimental as it would be with a turbo.
Dec 6, 2024 | 09:25 AM
#13
LS1Tech Sponsor
Joined: Jan 2008
Posts: 462
Likes: 243
From: Ohio, Georgia, Nevada, Texas
OP,
Your Denali build sounds awesome! For your goals, the SUM-8720R1 that @68Formula mentioned would be a great fit. Specs on it are .600/.600, 218/227 112+2 with -1* of overlap. It's mild enough for now but ready for a supercharger later.
Here’s what you’ll need:
Here's an idle video of the 8720R1 in a 6.0:
Installing the cam now will save you time and prepare you for the future supercharger. Let us know if you need help selecting parts or have any questions—we're excited to see how it turns out!
Your Denali build sounds awesome! For your goals, the SUM-8720R1 that @68Formula mentioned would be a great fit. Specs on it are .600/.600, 218/227 112+2 with -1* of overlap. It's mild enough for now but ready for a supercharger later.
Here’s what you’ll need:
- .600" Beehive Valve Springs: Will help keep the valvetrain happy to 6,500+ RPM.
- Pushrods: Likely 7.400" or 7.425", but measure to confirm.
- Delphi LS7 Lifters & Trays: A solid upgrade during the swap.
- LS2 Timing Chain and Cam Change Gasket Kit: Includes the extras to simplify the process.
Here's an idle video of the 8720R1 in a 6.0:
Installing the cam now will save you time and prepare you for the future supercharger. Let us know if you need help selecting parts or have any questions—we're excited to see how it turns out!
Last edited by Summitracing; Dec 6, 2024 at 09:32 AM.
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