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Old Jan 22, 2010 | 09:25 AM
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Rocker Arm Studs

I'm putting some scorpion 1.6 roller rockers on my ported E7TE heads. I've looked on ARP's website and found some part numbers, but I want to make sure that they are the correct size studs.

ARP Rocker Arm Studs Part # 100-7101
 
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Old Jan 22, 2010 | 10:27 AM
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E7 heads use pedistal rockers so you don't need studs.
 
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Old Jan 24, 2010 | 10:06 AM
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Crane makes some 1.6 roller pedestal mount rockers, FWIW.
 
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Old Jan 24, 2010 | 03:53 PM
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Do you have to get different pushrods with those rocker arms?
 
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Old Jan 24, 2010 | 03:57 PM
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No the stock pushrods should be fine. You could potentially gain some power using 1.7 ratio rockers but how much and if there is clearance for that depends what cam the motor has.
 
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Old Jan 25, 2010 | 08:26 AM
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Here is the specs on my cam

270/280 adv. duration, 204/214 at .050", 448/472 lift, 107/117 lobe sep
 
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Old Jan 25, 2010 | 12:20 PM
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No I wouldn't risk 1.7 rockers with that cam. Check out summit racing for the rockers they have a selection for these motors.
 
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Old Jan 25, 2010 | 04:36 PM
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I have a set of 1.6 rockers. You think that would work, if not what do you recommend. I'm trying to not have to change pushrods.
 
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Old Jan 25, 2010 | 04:36 PM
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Why would 1.7 rockers not be good?
 
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Old Jan 25, 2010 | 09:56 PM
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If you have 1.6 pedistal rockers then you're good but if they are stud mount then no you can't use them. My comment about the 1.7 rockers was based on a guess that they would produce quite a bit more than 0.500" lift but after actually running it through the calculator I see that they would only just exceed 0.500" lift on the exhaust and that's OK. The stock springs can only handle a little over 0.500" lift so that's why this is a concern.
 
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Old Jan 26, 2010 | 07:59 AM
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Well I bought these ported E7's from as guy that works with my brother. The springs are not stock, he said they were softer than stock springs. The motor he was going to put the heads on had close to the same cam I'm runnning.
 
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Old Jan 26, 2010 | 08:04 AM
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I doubt the springs are softer than stock I don't think you can buy any that weak, but regardless springs are not going to be an issue anyway.
 
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Old Jan 26, 2010 | 08:13 AM
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So your recommending 1.7 over 1.6. What do those numbers actually mean?
 
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Old Jan 26, 2010 | 09:01 AM
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Rocker arm ratio is simply how much it multiplies cam lobe lift. Your cam has lobes that are 0.280/0.295" high, so multiply that by 1.6 or 1.7 to get the actual valve lift.
 
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Old Jan 26, 2010 | 11:06 AM
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Where does the 0.280/0.295" high cam lobe numbers come from?
 
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