Converting stock 8mm rockers to 10mm [Archive] - GrandAmGT.com Forum

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chris_gt_74
08-19-2012, 10:12 PM
I seem to have the hardest time locating a near new or new set of 10mm rocker arms. Is there a source for them? How expensive?

But in the meantime I did recently buy some really cheap from blackhart71 that were supposed to be 10mm and ended up being 8mm but are nearly new looking with little to no wear. My car originally took 8mm stock but after a head mix up when I got ported and polished one's, they are now 10mm. My first set of 10's were worn pretty badly for my liking and I only used them because of the head mix up. Well then I found another set from another user on here that were in better condition but still fairly worn which are installed on my car now. Well I took one of 8mm rockers and compared them to one of the pretty worn out 10mm rockers and I wondered if either one or both of these solutions would net me a usable set of 10mm rockers that are very close to new. The first question I had was if the hole in the roller could be widened with a drill press to accept the 10mm studs. The 8mm rockers have a hole that is ~.336" and the 10mm rockers have a hole that is ~.400". The 2nd question was whether or not the whole bearing/roller part could be swapped without being damaged by using a press or punch and various tools I had around. I had some other some junk rockers I fooled around with to see how difficult it would be to take them apart. Well it turned out to not be hard to get them apart and undamaged pretty easily. But putting them back together was a bit more challenging getting the bearings and everything snug and lined up. But after much cleaning and teadious needle bearing repacking I have the whole set of 8mm's swapped to 10mm. Here are some pictures if anyone wants to see them. Now the only real question is how much side to side play does a stock rocker have in the bearings? I got them to where there is very little play in them and the bearing spins freely without any snags. In fact they spin better than those really worn out one's I did have. Probably because they are clean and don't have any crud in the bearings. If I had thought of it before hand I would have made some better observations on how centered and bearing play there was. If no one can really say then I will leave them as they are until I decide to install them and compare them to the one on my car right now. Anyway here are the pics.

Completely disassembled
http://i289.photobucket.com/albums/ll234/grand_am_gt_74/IMG_20120819_123900.jpg

Just to show there condition
http://i289.photobucket.com/albums/ll234/grand_am_gt_74/IMG_20120819_123948.jpg

All parts cleaned and ready to go back together
http://i289.photobucket.com/albums/ll234/grand_am_gt_74/IMG_20120819_131316.jpg

The final product, 10mm rocker arms :)
http://i289.photobucket.com/albums/ll234/grand_am_gt_74/IMG_20120819_171911.jpg

HOYS
08-19-2012, 10:28 PM
Thats cool! Are those my old ones?

chris_gt_74
08-19-2012, 10:32 PM
Thats cool! Are those my old ones?

Yep. The studs, rollers (whatever they are called lol), and bearings came from the old 10's I got from you.

HOYS
08-20-2012, 02:24 PM
Awesome, good work!

chris_gt_74
08-20-2012, 03:34 PM
Awesome, good work!

Thanks! I'm gonna make a few adjustments to them before I call them totally done but the hard stuff is finished.