See if this link helps.
http://forums.y-blocksforever.com/Topic10464.aspx 

Lorena, Texas (South of Waco)

I thought it was interesting to read that Comp cams talk about oil spray over the valve springs prevent breakage! Cooling the spring etc.

the t chain and dist will still get plenty of lube,the spllage frome the rockers can only go to the dist or the chain as the valey has only drains at both ends.Unless one is looking to run 7500rpm,wher spring presure is higher and chain load is heaveyer. in my exp you will be better off with pressure rocker lube and reduced galling  on rocker shafts and partial sezing(wiping cam lobes) the stock chains ar not the best but usually good for70-to 80000miles. look at the fes,they have presure lub to the rockers with no beter lube to dit or chain,in fact the share the run off. i have not observed mid life ys that have no scored rocker shafts.. just my take.

Paul,

I honestly watched Tims videos and thought he pretty well explained the concern of distributer and timing chain oil. I would really like to hear from anyone who has tried the modification and not liked it. I would think the modification has been out long enough now to be pretty well put to the test. Although I have a set, I have never installed them or had a chance to prove or disprove them. If anyone has lost a distributer or timing chain for lack of oil from pressurized rockers, by all means, please step up.

Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's

Ah!  Pressurizing the rocker assembly.. another controversial modification. Good for the rocker assembly, but what about the reduced oiling to the distributor at one end & the Timing Chain at the other end? There have been further posts in the past about ensuring enough oil to those parts. Best check it out further if anyone plans to block off the rocker tube drain tubes.. Maybe "Ted" can direct you to those posts?   


Paul

the mods on the video are great,i did a couple with a plate and gasket. just did a set as the video showed,the hole in the stand is corect for a 5/16 tap and just need a bolt turned down,i used a screw so ther was clearance when tightning the stand bolts. great vidio

Thanks Paul,

I have a modified set of arms from Tim McMaster and I really like the video's he's done on You Tube explaining the modification and the follow up showing why he feels there is no excess of oil caused by the modification. That modification has been out there long enough I was hoping to hear from others how it had worked for them. I have not installed mine yet, and am looking at modifying another set in the near future.

Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's

I have two yblock cars.  One is a 56 Bird which I have driven to the west coat from the east coast twice and has an engine with undetermined miles although the heads have been redone..  I run the drain tubes in the stock setup.  I have no oiling problems with it this way.In the other car, it has a modified but not a race car engine.  I have done some long drives with this (but not like the Bird) and have no oil related problems.In a race car, I can see blocking the drain tubes, a street car - no. I know others disagree, but that's my feeling. I like the idea that the distributor and timing chain are getting a good supply of oil.I believe people have done a modified version on the return tubes by inserting a plug in the tube that is drilled for some oil to get through but not the full volume.



54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

the oil tube insures circulation and drains into a chanel that gives oil to timing chain,the other side drains into the dist gear end. I have blocked the the tubes as it is more important for rockers to get plenty of lube. had 1 stand that was  the lubehole leaking at the base causing spray onto intake valve ,and some smoke. so i made sure the stand was flat. also ct a grove in the stand with a flatened drill bit in the drill press,to acomidate a small oring.no more smoke and lots of oil to rockers and valve train. as others i feel when you have cast rockers runing on hard steal shafts ther should be constant pressure to rocker shaft. the other  isue in my opinion is use a good 10-30 oil as it insures oil suply when engine is cold. most yblock rocker isues started with poor serviceing re oil change etce.if you reserch load that most,10-30 oils will handel it is verry close to so called raceing oils. also with pressure at rockers ther is plenty of leak by for timeing chain lube, and dit gear.the other resuls of lighter oil is cam lube is quicker,re rod oilholes and othe leakage

So I stumbled across another hole on the opposite side of the rocker shaft. There are actually two blocks (I guess the proper name is lift?) that get oil. One towards the center of the block gets oil from the head and the one at the end of the shaft supplies the oil tube. Man it would be easy to over look these and plug your oil supply.

Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's