Eddie1999

I have a 1999 Silverado with the 4.8. It has 862 cathedral heads. I want good cam sound and drive-ability on street and strip. Looking to get a LS 255/261 525"/525" 114°. Any input is appreciated.

mjs1012

iTrader: (36)

Take a look at this for an idea. I'm pretty sure you don't need a different converter to run this cam.
https://ls1tech.com/forums/dynamomet...hp-22rwtq.html

SSEUL8R

Anything around 208/212 or 212/218 is what I would run in my 4.8 if I decided to cam swap it. I wouldn't over cam a 4.8 in a truck. It's low compression, low displacement in a 4400 lb vehicle.

spawne32

iTrader: (2)

did i read 255/261 correctly? you are talking advanced duration right? I wouldnt run anything over 210 duration on either the intake or exhaust. My 214/220 in my 5.3 pushed my powerband up pretty high as it was.

96capricemgr

iTrader: (1)

First, cams are usually discussed in .050" duration not advertised.
Second when comparing 5.3l results the smaller displacement will show compromises sooner, while the above linked cam might be fine in a 5.3 with stock stall that does NOT mean a 4.8l will be.
I wouldn't try a bigger cam in a 4.8 without the expectation of needing a higher stall.

Eddie1999

I plan on using a stall converter. That is advertised duration. Specs show
Application: Chevrolet Gen III/IV LS Series 3-Bolt 1997-Present
Ignition Firing Order: OE (1-8-7-2-6-5-4-3)
Cam Style: Hydraulic Roller (with Cathedral Port Heads)
Basic RPM Range: 1000-5600
Manufacturers Description: Big torque in 4.8L, 5.3L, or 5.7L. Needs good intake and exhaust.
Intake Duration @ .050": 208
Exhaust Duration @ .050": 214
Advertised Intake Duration (@ .006"): 255
Advertised Exhaust Duration (@ .006"): 261
Intake Valve Lift with OE Rocker Ratio (1.70): .525"
Exhaust Valve Lift with OE Rocker Ratio (1.70): .525"
Intake Lobe Lift: .308"
Exhaust Lobe Lift: .308"
Intake Valve Lift with 1.72 Rocker Ratio: .531"
Intake Valve Lift with 1.75 Rocker Ratio: .540"
Intake Valve Lift with 1.80 Rocker Ratio: .556"
Exhaust Valve Lift with 1.72 Rocker Ratio: .531"
Exhaust Valve Lift with 1.75 Rocker Ratio: .540"
Exhaust Valve Lift with 1.80 Rocker Ratio: .556"
Lobe Separation Angle: 114 Degrees
Intake Centerline: 110 Degrees
Lifters Included: No
Small Base Circle: No
Cam Gear Attachment: 3-Bolt
Valve Adjustment: Zero Lash Plus ½ Turn
Manufacturer: Howards Cams & Racing Components
Manufacturer's Part Number: 192705-14
Weight: 10.0 lbs.

I have looked at several and this was recommended by Howard's Cams. Just need input on whether this is going to give me the sound I want and still be a good driver.

Tuskyz28

Sound is not all in the cam.... lobe separation angle is part of it but a lot of it is in the tune.

DavidBoren

I'm actually surprised by how different this is compared to both Kip's and Martin's truck cams.

Kip's truck cam:
205/210 .510/.510 115+4
16.5, 41.5, 36, 6

Martin:
206/206 .560/.540 114+4
15, 41, 33, 7

Your Howard cam:
208/214 .525/.525 114-4
6, 34, 45, 11

Eddie1999

I have not been able to find much info on this particular one.

DavidBoren

What information are you looking for?

The numbers separated by commas are the IVO, IVC, EVO, EVC events (respectively). You can't get much more detailed information than that.

As for real world results for that particular cam in a vehicle comparable to yours... I have nothing.

Eddie1999

That is what I am looking for lol. Someone who possibly has used this one.