gbledsoe3

Here a two pictures one on the #1 intake lifter bore and the other from the #2 intake lifter bore. The cam lobe doesn't appear to be centered exactly below the lifter bore. This a hydraulic roller cam with roller lifters.

Is this ok or do I have issues?

#1 Intake Lifter Bore
#2 Intake Lifter Bore

cutlassefi

It's fine. You'll notice once you install the lifter the entire wheel is still on the lobe.

gbledsoe3

Thanks. Working on filing the cam bolt down to get .010 clearance to the front cover. I'm at .008 now so just a bit more as I sneak up on it.

Ozzie

I can understand why the designer of a flat tappet cam would want to offset the lobe so as to achieve rotation of the lifter, but I have difficulty understanding why the designer of the roller lifter cam would want to offset the lobes of the roller cam when rotation of the lifter is not desired.

GOSFAST

I would recommend matching the roller cam against the OEM piece with respect to dist drive gear location from the face of both cams, this will tell the true story?

Personally I would not use that cam with those lobes off-centered like that.

On a side note, I would also "pin" the rear main seal if using the "rope"??

Thanks, Gary in N.Y.

P.S. Also, with respect to setting the cam end-play for the roller, having done a number of these units I would recommend having the water pump bolted in place when checking the end-play, not just the timing cover. If you don't mount the pump you risk ending up having the wrong clearance. Known about this issue for years now, the pump directly affects that final clearance.

cutlassefi

Well you need to take into account a couple of things.
The cam is .040-.045 further forward because of the washer behind the cam flange. And as long as the roller is 100% still on the lobe, which it will be, it doesn't matter.

Ozzie

I can understand that it might "work" with the lobe offset, but when a design is being done from "scratch", surely the designer would have knowledge of any needed spacers and it would seem like he would have to have some purpose in mind when he purposefully includes a lobe offset in the design.





I just have difficulty understanding what his purpose was.

cutlassefi

You'd be surpeised how many manufacturers really don't know sh** about the finer points of a lot of different engines.

Ozzie

You're probably right, and they probably should be doing some other work.