rocker arm ratio ??? - Pontiac GTO Forum
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post #1 of 8 (permalink) Old 10-29-2005, 04:07 PM Thread Starter
 
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rocker arm ratio ???

what is the stock rocker arm ratio ??????
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post #2 of 8 (permalink) Old 10-30-2005, 12:04 PM Thread Starter
 
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anybody ??????????
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post #3 of 8 (permalink) Old 10-30-2005, 12:16 PM
 
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I believe it's the same as the LS1 it's 1.6.
Be careful if your planning to change it to a higher ratio, you will need to upgrade the springs and check for piston to valve interference.
BTW I changed from 1.6's to 1.85 on my C5 and it made a nice midrange and upper end improvement.
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post #4 of 8 (permalink) Old 10-30-2005, 12:20 PM Thread Starter
 
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thats why im asking....might get some harland sharp rollers ?????
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post #5 of 8 (permalink) Old 10-31-2005, 01:09 PM
 
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Quote:
Originally Posted by flht3
thats why im asking....might get some harland sharp rollers ?????
I used the SLP's, their made by the same mfg that makes the stock roller rockers, the roller tip is of no advantage on the Harland Sharps.
They only need it because they don't maintan the true geometry of the stockers that the SLP's do.
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post #6 of 8 (permalink) Old 10-31-2005, 04:56 PM Thread Starter
 
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i never heard that ??? i do know the intake and exhaust rockers are tied together {with the harland sharps}, to keep the proper geometry...and any jessel set up i have seen, has roller tips and there top shelf..
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post #7 of 8 (permalink) Old 11-01-2005, 12:46 AM
 
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Rocker ratio is 1.7
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post #8 of 8 (permalink) Old 11-01-2005, 09:00 AM
 
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Quote:
Originally Posted by Route 66
Rocker ratio is 1.7
Yep your right it is 1.7.
But it's easy to increase the ratio just by moving the fulcrum point but it destroys the rocking action at the tip.
It then becomes a sliding action which side loads the valve stem increasing the wear on the guide.
So to compensate for it they add a roller tip that eventully fails and becomes a valve keeper remover!
It's really hard to beat the stock design and most after market rockers actully weigh more then the stockers.
And if there was any real gains to be made by tieing the intake to the exhaust using the same shaft I would bet the General would have done it.
Look at the top engine builders and they all use the stockers unless the customer insist's otherwise. A&A Corvettes, ECS, etc.
Frankly if your doing your own work (I do) and don't want to break open the engine to replace the cam it's worth while if you get a good price on the rockers and springs and retainers (I did).
If you have to pay someone else to do it then it's a tolal waste of money IMHO
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