Cam bearings 4.1

[lazaris]

Are the cam bearing sizes the same for 4.1 stage2 offcenters as 3.8's?

 

[9SECVSIX]

Stg11 Cam bearings

Cam bearing for the 109 blocks and the 4.1 Stg11 offcenter blocks are different, the prefered method ( by the several builders in this area that built a lot of V6 buicks for the Busch north cars)in Stg motor applications is to use the Clevite 77 # SH-1360 bearing, it,s the wide bearing ,you,ll need to order 4 of that part number, I get them through NAPA, takes about a week. If you order a set for a 4.1 (14bolt pan block) you,ll get 1 wide and 3 of the narrower bearings. Cam bearing life with all 1360 bearings is sure to be extended, especially when using big roller cams.
Something to remember , if a Stg11 block spins a cam bearing or two and needs repairs the cam bearing bores can be bored out for the .020" larger dia 109 bearings , two sets would be needed to complete the job.

9sec.

 

[lazaris]

9sec,

Thanks for the info. What different about the journals in the 4.1 stage2? Wider?

 

[Lee Thompson]

cam bearings

An 86-87-109 block has the front and rear bore .020 larger in dia. than the older 14 bolt pan blocks, which include the Stage II. All the bores in a Stage II have the same size bore. I have seen Stage blocks with all wide bearings in them. Personally myself and others are using standard bearings---The front one wide and the other 3 narrow. I believe the width of the bores are all the same.

 

[lazaris]

Thanks Lee.

 

[STP]

I am using all Clevite 1360's in mine...So far so good