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Author Topic:   How can you tell ratio of rocker arm?
JT54
Dirt Maniac

Total posts: 170
posted September 10, 2005 06:18 PM  
I had what I thought were 1.5 stainless rockers on my engine I wanted to get a little more lift so I went to put 1.6 rockers on and they compress the springs way les than the other rockers.....I am thinking they must be 1.7 or 1.8 how can I tell ?....the only markings are a zero on the push rod end....thanks ...JT

DJR22
Dirt Maniac

Total posts: 111
posted September 11, 2005 12:56 AM  
Can I assume your talking sbc? I'm pretty sure you could tell the differance between a 1.5 and 1.7/1.8. Big block chevy's use a 1.7 I think and they won't even fit under the small block valve cover. I'm no expert but to make a different ratio do they just make the valve end longer and the push rod end the same length?...maybe not. Measure your lift at the cam lobe and then at the valve and divide the two and there you have your rocker ration...more or less.

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JT54
Dirt Maniac

Total posts: 170
posted September 11, 2005 09:57 PM  
Oh the old arithmatic thing...thanks!

stockcar5
Dirt Forum Champ
Total posts: 578
posted September 13, 2005 03:40 PM  
to make a higher ratio they move the pushrod cup on the rocket closer towards the rocker fulcrum (pivot). flip them over and see how they compare. if the are the same brand it should be very easy to tell.

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