high ratio rockers
#11
Join Date: Apr 2010
Location: Mentor, Ohio
Posts: 12,195
Rockers vs Cam is all dependent on what you're end goal is.
As I understand, some times you can use rockers in place of an aftermarket cam (as they are easier to swap then a cam). But I am far from a master with understanding cams and all the math behind what's going on with how they affect valve timing.
As I understand, some times you can use rockers in place of an aftermarket cam (as they are easier to swap then a cam). But I am far from a master with understanding cams and all the math behind what's going on with how they affect valve timing.
#12
Cam, by a long shot. However, if you're only going to mod just a little bit, then your gains from a cam won't be near as much as if you went all out. All rockers do is make the engine act like the cam has a bigger lift then it actually does, but with a different cam you can control not just how much lift you have, but also how long each valve is open.
Basically speaking, rockers control:
Lift
A cam controls:
Lift
Duration
Centerline
Lobe Seperation Angle
Basically speaking, rockers control:
Lift
A cam controls:
Lift
Duration
Centerline
Lobe Seperation Angle
#13
if you go with rockers, go with a set of rollers, the modified rockers flex and deflect making them less effective. The rollers that are available do not flex and reduce friction, and they quiet down the valvetrain as well
105# springs would remedy this, but they eat the timing chain faster than stock,
and by the way you can get the yella-terra's from intense-racing.com or ZZP, ZZP appears to be out of everything from 1.8 up so 1.7's are the biggest you can get there for a while, i got mine from intense about a year ago
As I understand, the '05 LT is a naturally aspirated 3800. You'll want more then just rockers to get the most out of the mods. If you talk to the guys on the Bonneville forums, mod #1 should be a port matched LIM.
I'd say the absolute basic formula for what you're doing:
- ZZP DP w/ High flow cat (which you got) and a PLOG
OR
- Headers (depends what your full intentions are)
then rockers, a throttle body that allows more air in, maybe a CAI
I'd say the absolute basic formula for what you're doing:
- ZZP DP w/ High flow cat (which you got) and a PLOG
OR
- Headers (depends what your full intentions are)
then rockers, a throttle body that allows more air in, maybe a CAI
I don't see ANY UPGRADED SPRINGS on that list, and you went up to 6800 RPMS??? You shouldn't go above 5900 on the stock valvetrain.
What's better rockers or cam?
The only real benefit to rockers is ease of install. A cam in these FWD cars is really a pain to remove compared to just removing a few brackets, the valve covers- and swapping rockers out.
#15
You don't have to buy new lifters.
As far as the valve springs are concerned, it would depend on which cam you buy as to whether or not you would need new valve springs. If you do need new valve springs, you would then need to figure out which valve springs to get. Do you need 90# springs, 105#, 130#, etc. After that, you then need to decide if you need stronger springs for you intake valve compared to your exhaust valves. Some people have installed 130# springs on the intake valves while their exhaust valves had 90# springs installed. It all depends on the build.
As far as the valve springs are concerned, it would depend on which cam you buy as to whether or not you would need new valve springs. If you do need new valve springs, you would then need to figure out which valve springs to get. Do you need 90# springs, 105#, 130#, etc. After that, you then need to decide if you need stronger springs for you intake valve compared to your exhaust valves. Some people have installed 130# springs on the intake valves while their exhaust valves had 90# springs installed. It all depends on the build.
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