Foxy Green Foxbody Build

The ticking comp lifters measure in at:

.8730 to .8731

New Johnson's measure in at:

.8738 to .8739

Just saying it out loud
 
So maybe the noise was from the comp lifter's being too loose? Can also cause scuffing.
Your lifter bore will not tighten up with heat, it will increase in clearance.
Cast iron will change in size more than harder steel alloys.
 
Badd_Dadd said:
So maybe the noise was from the comp lifter's being too loose? Can also cause scuffing.
Your lifter bore will not tighten up with heat, it will increase in clearance.
Cast iron will change in size more than harder steel alloys.
Click to expand...

You are the second person today to tell me that too much clearance will cause a ticking lifter
 
If the Johnson lifter's slide in with light lube and fall by their own weight, I'd consider em good.
You shouldn't feel a sloppy fit, if you do, your likely about .003 or greater.
You get a feel for that shit when you've perfected wrist pin fit an the Harley.
 
If the clearance was too big for the Comps I think that problem Johnson lifter would've fit.
 
Badd_Dadd said:
If the Johnson lifter's slide in with light lube and fall by their own weight, I'd consider em good.
You shouldn't feel a sloppy fit, if you do, your likely about .003 or greater.
You get a feel for that shit when you've perfected wrist pin fit an the Harley.
Click to expand...
I think part of the reason Johnson is so adamant about .0018" is because of the axle oiling feature. I don't know if being reduced travel is affected by clearance
 
Steve439 said:
If the clearance was too big for the Comps I think that problem Johnson lifter would've fit.
Click to expand...
Not necessarily.

The burr made the lifter measure .8750" according to the guy that checked it. He just took a diamond hone to the burr when he finally found it.

Even if the bore was .8750 it would have felt like a press fit and I didn't try to force it.
 
89 Fox 427 said:
I think part of the reason Johnson is so adamant about .0018" is because of the axle oiling feature. I don't know if being reduced travel is affected by clearance
Click to expand...
Internal mechanism should not be affected unless it is not being fed adequate oil.
The lifter feed hole should be in the oil galley area at zero lift, double check.
Your not going to over feed the lifter.
I could look back in the threads, but I'll ask.
What was oil pressure when you had it running.
And you did drain the break in oil?
It has no rust inhibitors in it.
 
89 Fox 427 said:
Not necessarily.

The burr made the lifter measure .8750" according to the guy that checked it. He just took a diamond hone to the burr when he finally found it.

Even if the bore was .8750 it would have felt like a press fit and I didn't try to force it.
Click to expand...

A roller lifter should be OK with .002 clearance so if the Comps had too much clearance the bore would be over .875.
 
Badd_Dadd said:
Internal mechanism should not be affected unless it is not being fed adequate oil.
The lifter feed hole should be in the oil galley area at zero lift, double check.
Your not going to over feed the lifter.
I could look back in the threads, but I'll ask.
What was oil pressure when you had it running.
And you did drain the break in oil?
It has no rust inhibitors in it.
Click to expand...

60+ oil pressure

Yes, no break in oil anymore. Because of the clearances they want Lucas 10w40 zddp so that's what I'm using.
 
89 Fox 427 said:
Not necessarily.

The burr made the lifter measure .8750" according to the guy that checked it. He just took a diamond hone to the burr when he finally found it.

Even if the bore was .8750 it would have felt like a press fit and I didn't try to force it.
Click to expand...

Fascinating that quality control didn't catch that little problem, before it went out the door...
 
Just think of all the cool gauges and measuring devices you can now put in your toolbox and probably never use again for a year or two.

Sorta like a junior wantabee O'Neal.
 
I'm not sure if Mark is a micrometer kind of guy.
He probably got sick of measuring in tenths while he was making pistons.
 
I made a phone call and asked to speak off the record.

If I have .0009" clearance to .0022" clearance with the lifters, run em. If I was racing 7500rpm every weekend, then no.
 
Badd_Dadd said:
So maybe the noise was from the comp lifter's being too loose? Can also cause scuffing.
Your lifter bore will not tighten up with heat, it will increase in clearance.
Cast iron will change in size more than harder steel alloys.
Click to expand...

This guy said it, and I think he's right based off of how some of those old lifters looked...

Put the lifters in the holes, make sure preload is on point, move forward.
 
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