simple rocker arm question
Thread Starter
Burning Brakes
Joined: Apr 2005
Posts: 1,110
Likes: 0
From: JUPITER FLORIDA
simple rocker arm question
can your rocker arms change the lift of your cam?
i have vortec heads and the max lift is .480 , what parts limit my lift? what can i do to upgrade the heads for a higher lift?
Still learning about this stuff, thanks if you can give info!
i have vortec heads and the max lift is .480 , what parts limit my lift? what can i do to upgrade the heads for a higher lift?
Still learning about this stuff, thanks if you can give info!
Drifting
Joined: Mar 2005
Posts: 1,923
Likes: 0
From: GA
Going to 1.6 rockers will give you about 0.030" more lift at the valves.
If your current cam is .480" lift now you'll end up at .510" (or there about). If you have stock vortec heads you'll probably need different springs, and you had better get screw in rocker studs.
If your current cam is .480" lift now you'll end up at .510" (or there about). If you have stock vortec heads you'll probably need different springs, and you had better get screw in rocker studs.
Thread Starter
Burning Brakes
Joined: Apr 2005
Posts: 1,110
Likes: 0
From: JUPITER FLORIDA
so that means a decent gain in horse power with the added lift?
and just studs and springs is all i would need to make the heADS support the higher lift? sorry about so many questions!
and just studs and springs is all i would need to make the heADS support the higher lift? sorry about so many questions!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by cplonner
and just studs and springs is all i would need to make the heADS support the higher lift? sorry about so many questions!
RACE ON!!!
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
I agree with the posts. Anytime that you change the factory valvertrain parts or geometry, you must check everything. Aftermarket rockers are sometimes known to rub on the edges of the spring retainer also.
Burning Brakes
Joined: Aug 2000
Posts: 1,146
Likes: 2
From: Albuquerque NM
Originally Posted by cplonner
can your rocker arms change the lift of your cam?
i have vortec heads and the max lift is .480 , what parts limit my lift? what can i do to upgrade the heads for a higher lift?
Still learning about this stuff, thanks if you can give info!
i have vortec heads and the max lift is .480 , what parts limit my lift? what can i do to upgrade the heads for a higher lift?
Still learning about this stuff, thanks if you can give info!
The press in rocker studs limit the valve spring rates-thus RPM and or max lift.
In MY opinion don't look at anything beyond the lt4 hot cam (moderate lift and slow ramp rates)
good luck
btw what intake are you going to run?
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by cplonner
can your rocker arms change the lift of your cam?
i have vortec heads and the max lift is .480 , what parts limit my lift? what can i do to upgrade the heads for a higher lift?
Still learning about this stuff, thanks if you can give info!
i have vortec heads and the max lift is .480 , what parts limit my lift? what can i do to upgrade the heads for a higher lift?
Still learning about this stuff, thanks if you can give info!
No, changing rocker arms doesn't change the lift of the cam. The cam lobe lift remains the same.
What they do is change the amount and rate the valve is lifted off its seat. In other words, the valve is lifted higher and quicker when you swap from 1.5 to 1.6 rockers. Now, if you go the other way, change from 1.6s to 1.5s, the reverse occurs.
1.6 rockers also increase effective spring open pressure, because the springs are being compressed about .030" more. Many times, this increase in open spring pressure will cause press-in studs to pull out.
To switch to screw-in studs calls for pulling the heads to have the stud bosses tapped. The other option is to have your existing studs pinned, but that, too, calls for the heads to be removed.
Jake
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Thread Starter
Burning Brakes
Joined: Apr 2005
Posts: 1,110
Likes: 0
From: JUPITER FLORIDA
i have a .474 int/exh lift cam in there right now, and my intake manifold is the scoggins dickey ported base manifold.
if i have a .474 lift in there right now, then i would have to set up the heads to accept a higher lift than .480 so that i can accept the 1.6 rocker arms, is this right?
i wanna pull the heads in a little while to port and polish them, so i problably will do it all then if need be.
let me know if im way off track with the rocker arms and the lift please
if i have a .474 lift in there right now, then i would have to set up the heads to accept a higher lift than .480 so that i can accept the 1.6 rocker arms, is this right?
i wanna pull the heads in a little while to port and polish them, so i problably will do it all then if need be.
let me know if im way off track with the rocker arms and the lift please
