oil mod?
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Senior User
Joined: Aug 2002
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oil mod?
does anyone smarter than me think it's possible to drill the 7/16" hole in vitro? like, with the block still in the truck? my old 352 still runs great, good compression, it seems to pile oil up in the top end. or could i just put the holley jets under the rocker stands to restrict the top oiling and forget about the 7/16 hole for now?
thanks
thanks
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Not safely possible. You should be fine with the stock oiling system for now. Its just an easy way to make the engine last longer during a rebuild. If it is running good right now I would run it till she pukes.
Do you have a high volume pump? If you don't then the pooling of oil is caused by excessive clearance between the shafts and rockers OR your shafts are upside down. I would check this first. If the stands are correctly installed then jetting it would probably be the best option.
Do you have a high volume pump? If you don't then the pooling of oil is caused by excessive clearance between the shafts and rockers OR your shafts are upside down. I would check this first. If the stands are correctly installed then jetting it would probably be the best option.
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Senior User
Joined: Aug 2002
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you know, i never though about the rocker shafts, even though i learned the same lesson years ago with my last fe.how would a guy check clearances? i remember the last time, they were obviously pretty well shot. replaced em with an adjustable set, back then i think it was about $80 a side.
thanks again
thanks again
Post Fiend
Joined: Jan 2003
Posts: 8,600
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From: Iowa
You can use a caliper (that goes to thousandths) to check the inside of the rockers, and a 0-1" mike to check the shafts. Clearance should be .003" - .005", with a wear limit of .006". Usually, if you can see the wear on the shafts, and feel it with your finger they're shot.
Fleet Mechanic
Joined: Jul 1999
Posts: 1,360
Likes: 1
From: Iowa
If your old 352 is all original, it's possible that your oil drain holes are plugged with peices of valve stem seals. It happened on my 390. The first time I tore it apart I noticed a lot of debris, and not a lot of valve stem. I pulled the heads (without removing those bolts from the oil drainholes), cleaned everything up, replaced the valve stem seals and put it back together. They do drain a lot better now.
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
That is another good point I didn't think about. There was a whole bunch of that stuff in my heads when I tore my 360 apart. There was hardly any oil making it up to the heads by that point anyway. I have no idea how that engine stayed running.
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update. installed new shaft/rocker assembleys. cured problem. now i am hearing what i am sure is valve lash above 3000 rpm, just one or two. gonna pull it apart again and make sure no bent push rods. could have a soft spring? should have just spent the money on adjustables!
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