Cam bearings installed wrong
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Teching In
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Cam bearings installed wrong I have the workshop manual and it says to place the oil holes for the cam bearings at 5 o,clock. However I noticed that they are flipped and the holes appear to be at 7/8 o’clock. Is this going to cause a major issue or is it okay? Engine is a 5.7l lt1 out of a 93 camaro.
I believe there is an oil galley all the way around the outside of the bearing so oil pressure builds and comes through the cam bearing hole regardless.
I could be wrong but that's what i recall from when I rebuilt my top end.
I could be wrong but that's what i recall from when I rebuilt my top end.
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Joined: Jun 2013
Posts: 853
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From: Kernersville, NC
I have the workshop manual and it says to place the oil holes for the cam bearings at 5 o,clock. However I noticed that they are flipped and the holes appear to be at 7/8 o’clock. Is this going to cause a major issue or is it okay? Engine is a 5.7l lt1 out of a 93 camaro.
"How to Rebuild Small Block Chevy LT1/LT4 Engines"
#1 - holes at 10 and 2 o'clock
#2 - hole at 2-3 o'clock
#3 - hole at 2-3 o'clock
#4 - hole at 2-3 o'clock
#5 - hole at 2-3 o'clock
That book is well worth the money if you are rebuilding a GEN II LT1.
What Ace said is correct but many ppl and machine shops have run cam bearings in different positions and suffered no ill effects. Here's a quote...
It also says you don't want the hole in the bearing to line up with the block oil passage hole, because it might cause a momentary pressure feed-back that can prevent oil from traveling around the journal (the LT1 has full circumference grooves around the journal for oil flow to the bearing oiling hole and to the mains). They note that this also makes bearing position a little less critical.
Previous SBC blocks that did not have the full circle oil groove needed to have the oil holes aligned.
But for peace of mind i would get them re positioned if possible. But if you didn't chances are the motor would still live.
It also says you don't want the hole in the bearing to line up with the block oil passage hole, because it might cause a momentary pressure feed-back that can prevent oil from traveling around the journal (the LT1 has full circumference grooves around the journal for oil flow to the bearing oiling hole and to the mains). They note that this also makes bearing position a little less critical.
Previous SBC blocks that did not have the full circle oil groove needed to have the oil holes aligned.
But for peace of mind i would get them re positioned if possible. But if you didn't chances are the motor would still live.
