Hi Guys, Just had a new set of Hardened Dura-Bond cam bearings installed and i see that they only have a narrow slot for p***ing oil to the rocker shafts? My cam is the grooved version from john Mummert. Ans i am just wondering if i should drill out the bearing to enlarge these "slots" so that i will have more flow to the rocker shafts? thanks much.
I haven't put a wrench on the innards of a Y block in about 50 years, but I do remember there was a real problem with oil to the rockers from the beginning. But seems to me that someone has come up with a method involving the cam bearings to cure it. If you change your thread ***le to reflect that this is on a Y block, we have several experts on y block stuff around and one of them just might spot the thread.
The big problem with Y block rocker oiling is the block and head p***age don't line up. Most plugs I've seen are in the cross over at the deck surface. With todays better oils and regular service I don't see a problem.
The block/head oil p***age can be a problem, go over to yblocksforever, you can do a bit of relief work there. Most of the problems were non-detergent oil, road draft tubes, and no oil changes. John's cams have the groove properly cut for depth. You can also restrict the oil flow out of the rocker shafts, either with a drilled plug or a flattened tube. No worries about oil to the bottom end. I always run a closed PCV system. PCV valve choice is somewhat dependent on your cam choice and vacuum level. McTim or Ted Eaton sometimes machine a groove under the cam bearing (can't remember who) for added insurance. I've been fine with just John's cams and good oil. These are nice motors, I had my first one in '67, I'm still running 2. Makes me feel young when I look in the rear view mirror.
fun stuff. When I did my Edsel 292, I just put new cam bearings in it, and it worked fine...no other mods needed. The cam bearings are kind of narrow, and that center one with the grooves just doesn't have much bearing width, not enough to support the cam. It wears out kind of fast (60k miles on mine, it was work quite a bit). The groove in the cam only makes it worse. Good luck...
i recall kits that included oil lines that ran to the valve covers, but in those days i think a lot of the problem was non-detergent oil.
For the proper answers to all of your questions send a private message to Tim McMaster. He has the scoop on what you need to do for a reliable and strong Y Block build including oiling requirements. He also has a relatively simple procedure for pressurized oiling of the rocker shafts. His techniques are proven to work. http://www.jalopyjournal.com/forum/members/mctim64.68991/
Thanks very much for all the input. i think i will jut pressures and leave the holes alone as most have suggested again Many Thanks
We built a cutter to cut groove the inside of the cam journal like the FE motors have. Sent from my SM-G900V using The H.A.M.B. mobile app
Have a 292 with the oil holes drilled larger. Did this years ago and the car still runs great. Not a race car, just a daily driver. No issues and it is visibly better with the valve cover off.
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