[eutu1960]

I am trying to find out the clearance between the dog bones and lifter on a gen 1 sbc with the factory roller lifters, I have tried searching
but so far have not found anything, I also looked in the fsm and could not find any reference. Thanks in advance.

 

[johnsongrass1]

.003 max between the lifter and inside the hole of the retainer
.350ish max lobe lift
Generally speaking.....Dont wanna get too small a base circle either.

 

[eutu1960]

.003 max between the lifter and inside the hole of the retainer
.350ish max lobe lift
Generally speaking.....Dont wanna get too small a base circle either.

Thanks For The Info.

 

[eutu1960]

Brand new retainers from Summit measure .009 clearance, oem with 245 k on them measure .005,
I am measuring using a feeler gage. I am using Brian Tooley lifters.

 

[BOOT77]

Are you checking clearance in the engine, as I'm sure the lifter bores can vary engine to engine.

How much do your rollers move?

 

[eutu1960]

Are you checking clearance in the engine, as I'm sure the lifter bores can vary engine to engine.

How much do your rollers move?

I am referring to the lifter to dog bone retainer clearance, lifter bores are fine.

 

[BOOT77]

I am referring to the lifter to dog bone retainer clearance, lifter bores are fine.

So am I, measure the Dog Bone clearance when the lifters are in the engine!

 

[lmsport]

Summit brand or GM?

https://www.summitracing.com/parts/nal-12550002

 

[eutu1960]

Summit brand or GM?

https://www.summitracing.com/parts/nal-12550002

As I said earlier " Brand new retainers from Summit measure .009 clearance, oem with 245 k on them measure .005"

 

[BogiesAnnex1]

Less is better if the old ones provide less clearance without binding anywhere in the vertical movement of the lifter then reuse them.

The less of any roller misalignment error to the lobe the better.

Bogie

 

[Eduramac]

So am I, measure the Dog Bone clearance when the lifters are in the engine!

Of course.

 

[lmsport]

As I said earlier " Brand new retainers from Summit measure .009 clearance, oem with 245 k on them measure .005"

OK. lifters are defective, get GM lifters. The ls7 lifters are a good upgrade.

 

[eutu1960]

OK. lifters are defective, get GM lifters. The ls7 lifters are a good upgrade.

I have brand new Ls7 lifters, that is what I am using to check the clearance.

 

[BogiesAnnex1]

Keep in mind that the LS uses a plastic guide, in my mind this makes me wonder just how critical this is?

Bogie

 

[lmsport]

I checked a lifter and guide---clearance is 0.0025"

 

[eutu1960]

I checked a lifter and guide---clearance is 0.0025"

Thats much better than what I have

 

[eutu1960]

I have brand new Ls7 lifters, that is what I am using to check the clearance.

My lifters are actually Brian Tooley Lifters not gm.

 

[lmsport]

some of the link bar lifters are not very well aligned, especially like the old Crane pieces that had the spring to lift them out of the bore when the pushrod was removed. this may not be worth getting worried about, only during valve float would I be concerned.

 

[ericnova72]

This isn't a huge issue. The link bar or dogbone is just there to keep the lifter from rotating while it is on the base circle section of the cam lobe, with little(hydraulic roller) or no(solid roller lash) spring pressure on it.
As long as the lifter doesn't get sideways on the base circle, once the lifter starts up the actual lobe flank the roller wheel automatically aligns itself in the direction the wheel rolls, due to spring pressure in combination with lobe shape and wheel shape.

the lobe and wheel has a natural tendency to realign itself as the lobe begins to lift the lifter

 

[eutu1960]

This isn't a huge issue. The link bar or dogbone is just there to keep the lifter from rotating while it is on the base circle section of the cam lobe, with little(hydraulic roller) or no(solid roller lash) spring pressure on it.
As long as the lifter doesn't get sideways on the base circle, once the lifter starts up the actual lobe flank the roller wheel automatically aligns itself in the direction the wheel rolls, due to spring pressure in combination with lobe shape and wheel shape.

the lobe and wheel has a natural tendency to realign itself as the lobe begins to lift the lifter

I agree with you, considering how many miles I have I the oem ones.