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Progress Thread Diagnosis front end clunk (and more)

  • Thread starter Thread starter JD1964
  • Start date Start date Apr 1, 2026
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JD1964

there is enough sticking out to grab on to
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#41
  • Apr 20, 2026
  • #41
DadLife0724 said:
Supposed to be torqued ideally within 3/4 turn. Was it only #1 that gave you issues?
Click to expand...
It was 1 and 1/4
 

TOOLOW91

If you're the village idiot what's that make me?
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#42
  • Apr 20, 2026
  • #42
Those gaskets crush big time to seal

I wouldn’t change the bolts. I never did
 
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TOOLOW91

If you're the village idiot what's that make me?
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#43
  • Apr 20, 2026
  • #43
JD1964 said:
I’ve got the heads torqued down and I sized up my pushrod and rocker assemblies. I’m going to need to find my pedestal shims which are somewhere here in the garage. On cyl #1 TDC, it took 1 1/4 turns from zero lash to cinch up the rocker bolt. That’s too much from what I remember. Should be more like 1/2 to 3/4 from zero lash. Am I right?
Click to expand...
How are you checking this ? To measure technically you should be used a solid lifter or a modified Hyd that the plunger won’t collapse.

1/2 turn to 3/4 preload on the stud mount rockers from zero lash. I’ve found some lifters like a little Less then others.
 
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JD1964

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#44
  • Apr 21, 2026
  • #44
TOOLOW91 said:
How are you checking this ? To measure technically you should be used a solid lifter or a modified Hyd that the plunger won’t collapse.

1/2 turn to 3/4 preload on the stud mount rockers from zero lash. I’ve found some lifters like a little Less then others.
Click to expand...
I don’t think I’ve ever seen the solid lifter preload measure process for a hydraulic lifter valve train that used pedestal mounted rocker arms. Can you describe this method precisely or link me to a write up or YouTube that shows it?
 

JD1964

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#45
  • Apr 21, 2026
  • #45
TOOLOW91 said:
How are you checking this ?
Click to expand...
I gradually tighten the rocker bolt just to the point where there’s no slop in the rocker movement and the pushrod won’t move up and down but you can still just barely rotate it. Thats zero lash. Then I count the number of bolt rotation to cinch the bolt up snug. The first two I checked were 1 full turn and 1 1/4 full turn. That’s a tad too much for my liking
 

DadLife0724

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#46
  • Apr 21, 2026
  • #46
Are you looking at lifters and getting them both to lowest point before setting zero lash? I assume since you just put the heads on you still have lower intake off.
 

JD1964

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#47
  • Apr 21, 2026
  • #47
DadLife0724 said:
Are you looking at lifters and getting them both to lowest point before setting zero lash? I assume since you just put the heads on you still have lower intake off.
Click to expand...
Yes I’m on the base circle of the cam when doing the process. TDC on the compression stroke for the cylinder
 

DadLife0724

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#48
  • Apr 21, 2026
  • #48
JD1964 said:
Yes I’m on the base circle of the cam when doing the process. TDC on the compression stroke for the cylinder
Click to expand...
New set of lifters? If not, collapsed lifter could be a thing?
 

JD1964

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#49
  • Apr 21, 2026
  • #49
No collapsed lifters
 
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TOOLOW91

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#50
  • Apr 21, 2026
  • #50
JD1964 said:
I don’t think I’ve ever seen the solid lifter preload measure process for a hydraulic lifter valve train that used pedestal mounted rocker arms. Can you describe this method precisely or link me to a write up or YouTube that shows it?
Click to expand...
What are you checking ? Pushrod length or just shimming your rockers. I didn’t realize those heads still use pedestal rockers

Shimming your rockers , that ive never had to do I never ran pedestals except on a used engine I had but that didn’t last long.

So I can’t comment it sounded like you were checking pushrod length.
 

JD1964

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#51
  • Apr 21, 2026
  • #51
TOOLOW91 said:
What are you checking ? Pushrod length or just shimming your rockers. I didn’t realize those heads still use pedestal rockers

Shimming your rockers , that ive never had to do I never ran pedestals except on a used engine I had but that didn’t last long.

So I can’t comment it sounded like you were checking pushrod length.
Click to expand...
I’m shimming pedestal rockers. I have stock forged piston in this 302. According to Airflow Research, the AFR 165 Renegade pedestal style heads are the only AFR heads that work with stock pistons.
 

AeroCoupe

lube between the nut and the face. I know my lubes
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#52
  • Apr 21, 2026
  • #52
Meh, gonna call BS on that but my guess is they are saying without claying the motor because it all depends on the camshaft timing events as to whether or not a specific head will work with a specific short block. With you having a stock forged short block then you most likely have the pistons with the reliefs which opens up a whole world of possibilities.

Go here and scoll down to pedestal mount installation instructions:

Technical support

Scorpion roller rockers and shaft mounted rocker arms are the best in the world. Don’t Miss Anything!
scorpionracingproducts.com

Summit has them on their site as well:

https://static.summitracing.com/global/images/instructions/non-adjustable%20rocker%20instructions0909.pdf
 

JD1964

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#53
  • Apr 21, 2026
  • #53
These pedestal style AFR’s have 1.90-1.50 valves. Most others have the 2.02-1.60. That means something substantial as far as compatibility with the stock forged pistons
 

JD1964

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#54
  • Apr 21, 2026
  • #54
quote from the AFR product description on the AFR website.

"in addition these are the only AFR heads that are compatible with the OEM piston valve relief."

165cc SBF Street Cylinder Head

Cylinder Head Specialists
www.airflowresearch.com
 

JD1964

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#55
  • Apr 21, 2026
  • #55
FWIW, I’m running Ford Motorsport 1.7 full roller pedestal mount rockers. Made by Crane Cams and I’m not sure if they even make them anymore. Pretty pricey if you can find a set. There’s a set on eBay listed for $1000. Obviously I think that’s insane!

Here’s a couple pics of mine




 
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JD1964

there is enough sticking out to grab on to
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#56
  • Apr 21, 2026
  • #56
Yeah here’s a used set for $700

86-93 Ford Fox Body Mustang 5.0L 302 Cobra Crane 1.7 Roller Rockers OEM | eBay

93 Cobra 1.7 Crane Roller Rockers. Nate's 79-93 Fox Mustang Parts. 5.0L HOFits: 79-93 Ford Mustangs with 5.0L V8. I have to build those fees into my prices to cover those expenses.
ebay.us
 

JD1964

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#57
  • Apr 21, 2026
  • #57
And a new set for $1000

Ford Motorsport 1.7 Roller Rockers Pedestal Mount | OE

These are ford motorsport part number M-6564-A50 and crane part number F3ZE-6529-AB. I can't bring my self to open these. I have had these since 1994.
ebay.us
 

JD1964

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#58
  • Apr 21, 2026
  • #58
Still trying to find my damn pedestal shims. You see, I needed them and used them the first time around. Then I changed to Cometic head gaskets and ran a slightly thicker gasket so I didn’t need the shims. This time with the new AFR heads I’m going back to 9333 PT1 gaskets and I need the shims again. Can’t find em darn it. Might have to buy them again.
 

JD1964

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#59
  • Apr 21, 2026
  • #59
Ah hah!!! Getting warmer

 
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JD1964

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#60
  • Apr 21, 2026
  • #60
Got ‘em! The nice thing about searching for stuff is now I have a refreshed memory of other stuff in the inventory.

 
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