how much more do 1.6 rockers open valves?
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From: Greenwood, Indiana
Car: 1984 Trans Am
Engine: Vortec 355
Transmission: TH-700R4
Axle/Gears: GM Axles and GM 3.73
how much more do 1.6 rockers open valves?
ok i was checkin out www.paceparts.com
and i was lookin at the LT4 cam
this is what it says
well im gonna b runnin 1.5 rockers
my friend said that i should just take the valve lift and divide by 1.6....then multiply by 1.5 and that would get me the valve lift of it with the 1.5 rockers.....is this the correct way to do it?
if so.....then that means im gonna get bout 446/450 lift.....right?
and i was lookin at the LT4 cam
this is what it says
This is an LT4 production cam 1996. The duration at .050" tappet lift (intake/exhaust) is 203/210; and maximum lift with 1.6 rocker ratio (intake/exhaust) is 476/480. Valve lash is zero/zero and lobe centerline is 115 degrees. This is a hydraulic roller camshaft.
well im gonna b runnin 1.5 rockers
my friend said that i should just take the valve lift and divide by 1.6....then multiply by 1.5 and that would get me the valve lift of it with the 1.5 rockers.....is this the correct way to do it?
if so.....then that means im gonna get bout 446/450 lift.....right?
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Thats right. Dividing the valve lift by the rocker arm ratio gives you the cam lift, which really is a more important number to have IMO, especially since quite a few of the cam specs I have seen dont specify the ratio used, and then you find out they used an uncommon ratio. Then with cam lift you just multiply that by the rocker arm ratio and that gives you the valve lift.
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Joined: Jun 2001
Posts: 3,238
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From: Calgary, Alberta, Republic of Western Canada
Car: 1986 Sport Coupé
Engine: 305-4v
Transmission: 700R4 and TransGo2
With 1.5 rockers that will be an excellent street cam for a 305. I think you are going to like it a lot 
Thread Starter
Supreme Member
iTrader: (1)
Joined: May 2001
Posts: 1,638
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From: Greenwood, Indiana
Car: 1984 Trans Am
Engine: Vortec 355
Transmission: TH-700R4
Axle/Gears: GM Axles and GM 3.73
well i dont plan on putting this into my 305
im gonna build up a vortec 350.......lol
but thanks for the info
im gonna build up a vortec 350.......lol
but thanks for the info
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