rocker studs - Team Camaro Tech
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post #1 of 3 (permalink) Old Jul 7th, 01, 03:15 AM Thread Starter
Join Date: Dec 2000
Location: Federal Way WA USA
Posts: 5

More fun with the 68 Camaro Z28 302 Running ruff so pulled valve covers and found no 3 rocker off valve stem. checked push rods and adjusted clearance all the way around[solid lifters]Drove it a few days and running ruff again,pulled covers,no3 off again.Looks like the stud is pulling right out of the head with that big bad GM factory cam.Is there a threaded stud mod or is it time for some new heads or any other fix. Thanks John
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post #2 of 3 (permalink) Old Jul 7th, 01, 07:58 AM
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Join Date: Jan 2001
Location: skiatook, ok
Posts: 3,692

You can tell if a stud is pulling out by laying a straight edge across the top of the studs...the ones that are higher than the others will be obvious. I am assuming they are pressed in studs? If you do indeed have studs pulling out, the correct way to fix this is to yank the heads and go get them machined for screw in studs. If the studs are even, then most likely your rocker nuts are worn and need replaced. These nuts are pinched around the edges to get a better grip on the stud threads...after a while they loose their pinch and will back off quite easily. If the nuts are the problem then this would be a good time to upgrade to poly locks.

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post #3 of 3 (permalink) Old Jul 8th, 01, 07:11 AM
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Join Date: May 2001
Location: Michigan
Posts: 2,920

Travis is right, the best thing to do is pull the heads and have a machine shop pull the studs out, and machine the heads for screw in studs. I would also mill the stud bosses for use with pushrod guide plates as long as you are doing this. You'll want to run hardened pushrods afterwards. I have milled the stud bosses myself and it's qquite easy if you have access to a good mill. It's also very easy to drill and tap the heads yourself for screw in studs. But unless you have experience and a good set of machine tools leave it to a good shop. It doesn't cost much. I would also like to recommend you use ARP studs not GM. ARP have more clearance in the radius base and are longer overall. They also have more threads that run further down the stud. This is important in case the machine shop doesn't remove quite enough material it will allow you to adjust for the correct valve train geometry. Dorman and Summit both offer screw in studs, but Summit's don't have as much clearance in the radius area and Dormanhave a base nut that is quite thick which will take away from the correct geometry you're shooting for.
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