GMC_DUDE

I'm installing an LPE gt2-3 cam (among other things) in my 2003 4.8, and I noticed the cam bearings are worn to copper on the passenger side, but still have the silver babbit on the driver side. A search of this forum and PT.NET as to whether this was excessive wear turned up a definite "maybe" , so I decided to buy a micrometer and measure them. Unfortunately I can't find the dimensions anywhere. The Helms manual lists the o.d. for the journals on the cam itself, but not the i.d. for the bearings. Anyone know what this should be? Thanks.

JPH

iTrader: (2)

copper=no good. you can diffently tell which the cam side loads in the motor. .002 i think.

willyfastz

Bore's in the block
1-5 2.327 - 2.329
2-4 2.317 - 2.319
3 2.307 - 2.309

cam journal 2.164 - 2.166
outa round .001
run out .002

Lurius

iTrader: (7)

Not going to be fun to replace those if the engines in the truck.



-Lurius

GMC_DUDE

I have those numbers, but isn't the cam journal value the o.d. of the cam? At least that is the way it's shown in the manual.

The engine is not in the truck.

According to some threads here, not necessarily. That is why I want to measure.

427

iTrader: (3)

Some LS engines have the copper look when new. It is not uncommon to see copper in small patches on these engines. It looks like they bored or reamed the bearings in place on some blocks, kinda like the old Mopar engines.

Kurt

GMC_DUDE

Thanks for the info, Kurt. I think my safest bet right now is to just leave them alone. My oil pressure was fine before, the cam wasn't giving me any problems (except it needed to be bigger ), I'm not competent enough to do the job myself, and I don't trust any of the shops around here (they are all old-school SBC types). If it starts giving me problems later on, I'll deal with it then. Peace.

chriswtx

iTrader: (5)

Yeah, I have a brand new LS6 block and some of the cam bearings are showing copper...