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Discussion Starter #1 (Edited)
Just putting together a sticky containing info that I am always searching for. Might help some so I decided to share it. I will add to it as time progresses.

02-08 5.7L Cam Specs:
184/199 @ .050"
.294"/.286" lobe lift
.485"/.472" valve lift
115LSA
123ICL

Eagle Cam Specs:
188/205 @ .050"
243/267 @ .006"
.312"/.304" lobe lift
.515"/.502" valve lift
115 LSA

6.1L Cam Specs:
206/211 @ .050"
268/271 @ .006"
.340"/.330" lobe lift
.561"/.545" valve lift
117.5 LSA
121.5 ICL

6.4L Cam Specs:
215/221 @ .050"
.353"/.333" lobe lift
.582"/.550" valve lift
121 LSA
108 ICL



Fuel Injectors:

6.1: 34 lbs/hr
6.4: 44 lbs/hr
Blue Giants: 48 lbs/hr
SRT4 Stage 1: 55 lbs/hr

Spark Plugs:
Eagle Cylinder Heads

1 Step Colder: NGK ILZFR6D11
1 Step Colder: NGK LFR6AIX11
1.5 Step Colder: BRISK ER14YS
2 Step Colder: NGK LFR7AIX
3 Step Colder: BRISK ER12S

6.1 & 6.4 Cylinder Heads
1 Step Colder: MGK LZTR6AIZ 13
1.5 Step Colder: Brisk RR14YS
2 Step Colder: NGK LTR7IX 11
2 Step Colder: Brisk RR14S
3 Step Colder: Brisk RR12S
4 Step Colder: Brisk RR10S

Regardless of which engine you are running, use the spark plug based on what cylinder head you are running. This is just a rough guideline.
Up to 500hp: Stock Plugs
Up to 625hp: 1 Step Colder
Up to 775hp: 1.5 Step Colder
Up to 925hp: 2 Step Colder
Up to 1050hp: 3 Step Colder
Up to 1200hp: 4 Step Colder





Cam Specs and what they mean



The shaded area is overlap. Overlap is the amount of time both intake and exhaust valves are open.
Lobe Separation Angle is the angle relationship between the intake and exhaust lobes. If you narrow that angle, overlap is increased.
Overlap is what makes a cam "lope"
Duration is the amount of time in crankshaft degrees, that the valve is open. More duration with the same LSA will also increase overlap.
The raised portion of the lobe minus the base circle of the lobe gives you the lobe lift. The lifter sits directly on the lobe and when traveling on the base circle, the valve is closed. Once the bump in the lobe arrives, the lifter rides over that bump and this opens the valve.
The camshaft lobe lift is multiplied by the cars rocker ratio. Most in the industry consider our rockers to have a 1.65 rocker ratio.

Lets say you have the following cam.

220/228 350/340 113+3

220: Intake duration. The amount of time in crankshaft degrees that the intake valve is open.
228: Exhaust duration.
350: Intake lobe lift. (350 x 1.65 = 578 valve lift)
340: Exhaust lobe lift (340 x 1.65 = 561 valve lift)
113: LSA
+3: Amount of advance ground into the cam. In this case, the cam has a 110 ICL.

This particular cam has an advertised duration of 269/278 @ .006 and 220/228 at .050.
Using this cam, you get 47.50 degrees of overlap. (For 47.50 degrees of crankshaft rotation, both intake and exhaust valves are open at same time)

If we leave duration the same and change LSA to 117, we get: 39.50 degrees of overlap.

With the 117LSA and less overlap, you can expect:
a. Wider powerband, more peak power, smoother idle
b. Improved low-rpm responsiveness, better fuel efficiency, engine may run hotter

With the 113LSA and more overlap, you can expect:
a. Increased mid-range torque, faster acceleration, narrower powerband
b. lower fuel efficiency, potential for reversion. Low vacuum.


More Duration: Powerband moved higher in rpm range
Less Duration: More low-end torque
 

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Post anything you can find!
 

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Discussion Starter #3
Great Spark Plug Info from Dave at Nitrous Outlet and from forum member adanac charger.

We have to seperate this into two different types of spark plugs due to the fact that the Eagle head requires a gasket/washered seat compared to the tapered seat of the older 5.7 and 6.1's.

Eagle Cylinder Heads
1 Step Colder: NGK ILZFR6D11
1 Step Colder: NGK LFR6AIX11
1.5 Step Colder: BRISK ER14YS
2 Step Colder: NGK LFR7AIX
3 Step Colder: BRISK ER12S

6.1 Cylinder Heads
1 Step Colder: MGK LZTR6AIZ 13
1.5 Step Colder: Brisk RR14YS
2 Step Colder: NGK LTR7IX 11
2 Step Colder: Brisk RR14S
3 Step Colder: Brisk RR12S
4 Step Colder: Brisk RR10S


Regardless of which engine you are running, use the spark plug based on what cylinder head you are running.
Up to 450hp: Stock Plugs
Up to 550hp: 1 Step Colder
Up to 625hp: 1.5 Step Colder
Up to 700hp: 2 Step Colder
Up to 800hp: 3 Step Colder
Up to 1000hp: 4 Step Colder


Please use this as a reference and not as gospel. Each application will be different and depending on the power adder used, the heat requirements of the plug will also be different. You can use this as a starting point as long as you understand that you might have to change again based on actual results with your vehicle.
 

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Discussion Starter #4 (Edited)
We use Brisk Racing plugs for one main reason. They use Silver instead of copper, platinum, or iridium.

Silver is the best thermal (heat) conductor of all metals
- Allows for a wide spark plug heat range
- Excellent heat dissipation under max. power
- Excellent resistance to fouling under light load operation
Silver is the best electrical conductor of all metals
- Most free electrons
- Best power delivery
- Most powerfull spark

Construction:
- 1.5 mm Silver Fine Wire Center Electrode
- Low ignition voltage requirements (easier for spark to jump over)
- Reduces stress and wear on your coil and other ignition components
- Fires properly even if partially fouled, where standard plugs will fail
- Excellent for:
o Standard and High compression engines
o Forced induction applications
o Nitrous applications
o Methanol/ethanol injection
o LPG
o Any hard to ignite type of fuel applications
o High RPM race engines where is a short time for the ignition coil saturation
o Beneficial even for old vehicles with a weak ignition systems and/or excessive oil consumption

Tapered or Cut-Back Ground Electrode
- Provides sharp edges for easy spark discharge
- Excellent spark exposure to the air/fuel mixture
- Faster flame front propagation in the initial stages of ignition due to reduced ground electrode obstruction
High dielectric strength
- Fine wire center electrode (not just tip) increases the thickness of insulator between the center electrode and the spark plug shell for higher mechanical and dielectric strength.

BRISK SILVER RACING SPARK PLUG Low Required Supplied Ignition Voltage – is achieved by utilization of optimized diameter Silver center electrode, along with tapered ground electrode. Silver is the best thermal and electrical conductor of all metals and provides far superior electron flow for best possible spark plug spark delivery. This spark plug feature is beneficial in forced induction applications, or applications where the ignition system is pushed to the limit in modified power applications, and applications with hard to ignite fuels such as alcohol, LPG, Nitromethane and other. Brisk Silver Racing Spark Plug Lower Required Supplied Ignition Voltage is also beneficial for easier cold starts and operation under partially fouled spark plug condition caused by A/F management problems, oil consumption and other. Small diameter of the spark plug center electrode allows for thicker ceramic insulator walls and increased distance between the spark plug center electrode and spark plug shell walls. Increased spark plug center el. to spark plug shell distance, and spark plug special thick design insulator provides exceptional spark plug dielectric strength, and keeps the spark plug from dielectric break down in the most extreme working environments.

Spark Plug Buyer’s Guide Questionnaire
1) Name of series: Brisk Silver Racing spark plug
2) Spark plug intended use: Forced Induction applications, and all other applications. Brisk Silver Racing spark plug is the most versatile spark plug. It is excellent choice for old high mileage vehicles as well as modern high performance race and LPG applications.
3) Spark plug center electrode material: Silver – The material with the most free electrons. Silver is by far the best thermal and electrical conductor of all metals.
4) Spark plug center electrode diameter: 1.5 mm
5) Spark plug electrode style:
Projected: heat ranges 17, 15, 14, 12
Non-projected: heat ranges 12, 10, 08
6) Spark plug side electrode style: Tapered cutback ground
7) Spark plug shell material: DIN QST 36-3
8) Spark plug gap: ~ 0.7 mm
9) Available spark plug heat range: Brisk 17, 15, 14, 12, 10, 08
 
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