Small duration + high lift = ???
06-06-2006, 01:31 AM
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Small duration + high lift = ???
My cam right now is 230/236 @ .050, with .510/.520 lift. I'm putting on 1.6 rockers before I head up to the track, so it will be .540/.550 lift on that duration (maybe add 2-3 degrees because of the rollers). To me that seems like a lot of lift for those duration numbers. Do you agree? How does that affect the performance of the motor and how does it shift the power band?
06-06-2006, 03:08 AM
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Car: 1989 Pontiac Trans Am GTA
Engine: 357 Tuned Port Injection
Transmission: Borg Warner T-5
Axle/Gears: BW 3.45 9-Bolt
Are those cams hard on valvetrain parts? I have a 230/236 .596 .571 114lsa going into my bird. Someone told me I was going to be breaking parts. Should I have to worry about this?
06-06-2006, 10:17 AM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
it's hard-er on parts then a tamer cam. You get more power, with less high duration drawbacks. Instead of the cam lasting 150,000miles, maybe 80,000....? It's not just the high lift/duration, but the high pressure springs that you need to keep the lifters on the cam, that wear it out sooner.
06-06-2006, 11:08 AM
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Car: 86 Trans Am
Engine: 406
Transmission: TH350, 4200
Axle/Gears: Moser 9", 3.89
My cam is a solid roller. I use a stud girdle and have Comp 954 springs. The springs have 237 lbs on the seat and 537 open.
06-06-2006, 03:18 PM
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Car: Formula
Engine: 6.0 LSX
Transmission: 4L60E
Axle/Gears: 9 Bolt 3:27
The springs I run are not as high as the post above but are around 140 on the seat and 414 open. I also have Trick Flow rods, Comp pro mag rockers, titanium locks /retainers, and surprisengly the stock but cleaned 88K mile roller lifters.
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