Forgive me for some simple questions but I couldn't find the information that I need. I have a stock block 5.0L in a 95 GT and wanted to know the stock stamped rocker arm length is it 1.5 or 1.6? I see many with 1.7 roller rockers but are those recommended for aftermarket cams on stock pistons? I have read that at some point the pistons need to be notched but is that with a mild or wiild cam? I was considering a mild Comp Cam or TFS Stage 1 cam when I get heads and intake.
5.0L Valvetrain Questions
- Thread starter rowekmr
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I believe stock is 1.6. You can put roller rockers on a stock set up but you will see more bang for your buck elsewhere.
HiFlow5 0
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Stock ratio is 1.6:1 but because of the stamped steel they flex a lot.
A lot of guys run 1.7 rockers with a stock cam to help get a little more lift. I never understood why guys would buy 1.7 rockers and use them on an aftermarket cam? That's the point in replacing your cam with aftermarket, to get the desired lift you want with the duration designed into that cams specific lift.
Because, in addition to the lift, the duration and overlap characteristics of the cam change with the 1.7 rockers compared to the 1.6's. The 1.7's will allow the specs of the cam to be optimized for a specific engine combination.
f8tlfiveo
My wife likes my spool and blow-off valve.
HiFlow5 0
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Why not just buy a specific cam that meets the needs or your engines power band?
The cam creates the desired performance and powerband of the engine, but the rockers can tweak those characteristics. If you lift the valve with a 1.7 rocker, the valve will come off it's seat before it would with a 1.6 rocker. This will make the valve duration longer. Since the duration is longer the the overlap will increase too. The bigger advantage of using higher ratio rockers is that you can run a milder cam lobe and still have good valve action. Also, since the lifter has more mass than the rockers and valves, the higher ratio can help with high rpm stability and prevent valve float.
The rockers change cartain characteristics of the engine that cannot be ground into the cam.
The rockers change cartain characteristics of the engine that cannot be ground into the cam.
HiFlow5 0
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I don't know if I completely agree with that, but I agree with everything else you said. I still don't see the gains on any street driven car.
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