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Old 08-01-2012, 11:43 PM
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Rocker arm geometry

I checked the Manley website. The stock 351C push-rod is 8.400 long for hyd lift cam. Another forum said solid lift cams use 8.500 length push-rods. This is a 5/16 x .080 heavy wall diameter. It is a starting point for your push-rod checker. Take a black marker color the valve tip. Setup push-rod checker and roller rocker arms. Then spin the roller to leave a witness mark. It should be near center towards front of valve tip. Not dead center. After getting the correct length that leaves this mark as said measure push-rod checker. Another thing you may want to check into a set of Crane Gold roller rockers.


Last edited by cdminter59; 08-01-2012 at 11:50 PM.
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Old 08-08-2012, 11:34 PM
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Ok, for those that are interested in this post still i have officially found out the problem
I was told to call comp to get the specs and measurements of the rocker arm to check if they were possibly boxed wrong. and while talking to the tech, the reason the push rods were coming out of the seating cup, was the type of rocker i was trying to run was a cast aluminum stock replacement, and that being said, the thickness of the metal around the main bearing trenion had to be thicker, which is fine for stock, but i was told that they would nt have have held the 440 open spring pressure nor the lift that im using. so back to summit they went and im going with some scorpion roller rockers. the specs match up fine. and im told i should be really happy with the switch out. so for anyone that might have the same problem, take the time and call the company of the part your getting, summit doesn't know any specs unless provided by the company that makes the product. and most rocker arm companys dont post this with summit do your home work. and for the price, scorps will work great.
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