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Unread 01-07-2004   #1 (permalink)
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Default Stud vs pedestal mount rockers

I am trying to help a friend in Europe who has a 5.0L 1985. He wants a pair of Edelbrock cylinder heads. Apparently, 2 types: one for pedestal mount rocker arms (#60379) and one for stud mount rockers (#60329). Unfortunately, I don't know the difference between these 2 types of rockers . Can you help ?

Also, what are the rail rockers (#60329 will not accept them) ?

An last , would you know if he has hydraulic lifters or roller lifters (this is to select a camshaft kit).

Thank you...
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Unread 01-07-2004   #2 (permalink)
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The 85 manual transmission had a hydraulic roller camshaft . I dont know if the auto did or not . The difference between a stud mout and pedestal mount is easy enough . The stud mount heads have studs for the rocker arms the pedestal ones dont . Look for 8 studs sticking out of the top of the head . If you see them , then they are stud mount . If they are not there then they are ped mount . Why would your friend want 2 different types of heads ?

I will assume he only wants one type and you are asking what ones to get correct ? If thats the case then I would go with the stud mount , because they are stronger .

Another thing to consider is the pistons . I dont think his pistons will accept aftermarket heads . Someone correct me if I am wrong , but I think they wont .

I think you will have a hard time selecting the correct components for your friend . Maybe he or she should check out the web site and figure out what all will be needed . Or have them call edelbrock .
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Unread 01-07-2004   #3 (permalink)
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Sorry to inject my question, but do the rockers interchange from a stud and pedestal? Is it the way they are held down that is different or all the components?

Rail Rockers were only made in '76-'77 and they stopped some deflection in the rockers but added wear to the tip of the valve. In a drastic case the tip might wear far enough down to actually free the spring keeper and allow the valve to drop into the combustion chamber.
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Unread 01-07-2004   #4 (permalink)
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The rockers are not interchangeable. Pedestals have a fixed mounting position and are bolted solidly to the head. Stud mounts are for adjustable valvetrain and sit on larger diameter studs. Stud mounts are supported solely by the valve spring and the lifter, whereas the pedestals are held by the cylinder head.
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Unread 01-08-2004   #5 (permalink)
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He can use the 60329 (stud) head with 1.6 rockers.
I beleive the 85 pistons are flat tops also, so there shouldnt be a valve clearance problem with the edelbrock 1.90 intake valves, only if he goes to the 2.02 head (60359)
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Unread 01-08-2004   #6 (permalink)
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Thanks for all your answers.

Yes he wants only one type of heads. We are trying to match his engine with what Edelbrock recommends. I have talked with Edelbrock and once we know whether he has stud or pedestal, I think we'll be clear.

I'll ask him to open up his valve cover and confirm whetehr he has studs or pedestal. Based on the above, he shouldn't have any rails. Then we will go with the 60329 if he has studs or 60379 if he has pedestals.

Per Edelbrock, both these heads will work with the stock pistons. He will just need hardened pushrods with the 60329.

Another question: what is the 1.6 in a 1.6 rocker (GTRaptor) ?

For the hydraulic or roller lifters, I guess there is no easy way to know right ? Is there a code on the engine which would tell ?

Thanks.
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Unread 01-08-2004   #7 (permalink)
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If your friend is not rebuilding the short block with new pistons, he will have to pay attention to the amount of lift of his camshaft. For your question of either hydraulic or roller lifters. The lifters are hydraulic roller lifters.
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