He Zephyr, I apologize- for the Syntax errors, my Device was typing characters that were sometimes ok, others using a different App Store keyboard, and other times totally out of sequence. Damn..Apologies. Hope this dissertation helps, or opens your eves to something you missed.
Again, not getting a laugh out of anything, just trying to help how i can. I DO suggest you get a SHOP Manual for your Mustang. Lots of accurate info and diagrams, Mechanical, Electrical/Electronic, Vacuum, emissions, more..
BTW “Keepers” and “Locks” are the same thing,
Shop setup your Beehive springs? For 90$ in parts, you can run adequate Springs from TrickFlow, including Springs, Retainers, locks, Seals.
“You’re running the same physical sized Lifters, even when checking with 1 or 2 solid lifter(s).(!ALWAYS Check your at BDC if rolling over one lifter, all the rest- no Pushrods!)
Reset, my Cell seems to be OK. it seems OK.
- Onto your issue. Play-Doh is what most people use for P/V checking. Cheap & it’ll harden. Examining from beginning to end, there’s a component that is not the same as the rest if you’re that far off with Rocker height. I’ve not seen a single pedestal exceed 0.080, and that was once (1) time, of many rebuilt, prepped for stock or other, assembled & installed.
(Pic’s below).
As every motor is different, Heads have been cut(?), Gasket thickness(?), all components in that Cylinder the same(?) New Valve seats, Guides, retainers & keepers, pushrod ballpark centerline is 6.250- should be relatively close. What size did you run that are far too short now?
Ref: Piston to Valve: Minimum 0.080 with Intake & 0.125 Exhaust.
As “Close” is not good enough, of course. Should check with checker Springs & a Pushrod checker. Valve Stem Sweep starts from the actual motor side, outwards to max lift, and back toward the Bl. Near center sweep, smaller the better, but centered & within 0.070 is ok for maximum.
You’ve done P/V, all is ok? I imagine it should be, just checking..
I do the same setting Ford’s Geometry as in the video, initially. Don’t use it every time. Then I mark the top of the Valve Stem with a narrow, permanent marker line between the two using a straightedge across the outside of the Rocker, facing front of Block, #1 (Intake) Cylinder solid roller Rockers, light checker Springs,, line on Rocker should be parallel with the valvecover mating surface @
50% of Full Valve lift.
Pics below of yet another coil bound GT-40 Head, this one ate the Motors Cam Bearings, too.
Repaired, good for pictures below.
1) Find and mark the approx center of the Rockers ‘Trunnion’, Rocker laying on its side (pivot point where the 5/16-18 Bolt goes through the Rocker, and the approx. center of its Roller tip Trunnion to centerline of Roller tip pineach, and aim for the valve cover mating surface at 50% of total Cam lift, the line drawn should be level with that surface. the same angle with line drawn to cover mating surface
The Valves sit at the identical height on GT40, GT40P Heads. It’s the installed height on the Springs that differ.
I’ll explain the Spring/Retainer/Keeper(Locks)/Valve Stem workings.If you’re already familiar with this, well- it’s typing practice for me, lol! You’d also once said too much information is good, lol!
Retainers have an angle on the inside. In the Installed orientation, it’s tapered..smaller down bottom, larger up top. .
The locks are 2 Pc’s. Viewing the outside of the locks- held up & viewing with two fingers against a Valve Stem- you’ll note they also have an external angle present. Inside the keepers is a precisely cut, raised groove that fits into the 360 degree receiver groove ground into the Valve Stem, holding it in the correct spot.
This raised groove in the keeper fits perfectly into the grooves ground into the Valve Stems, the Retainers inner angle & the keepers outer angle forces the (2) keeper’s raised groove(s) solidly into the Valve Stem’s groove by the terrific force the Valve Springs exert on the retainer, combined with the angles on the Keeper(s), and the Retainer.
The original GT40/P Heads had a rotator Ass’y on the Exhaust Valve(s), but Installed Stem heights are identical. The Stem’s groove was simply ground higher up, running lighter Springs on the Exhaust side to accomodate the extra room the Rotator required.
When you drop in different retainers to gain Coilbind clearance, there’s one retainer that sits lower, the Exhaust Valves, higher for Intakes. This is to ensure equal Valve Spring pressures on the Cam. Adding Springs, Retainers, and keepers can gain you around 1/16”+ clearance to run a more aggressive Cam without pulling a Head. concern.
You had larger Exhaust Valves installed. “Equal height”
Believe that Equates to the grooves ground into the Valves as now being identical, so Retainers and Locks between Intake & Exhaust are now the same, I.e. Intakes or Exhaust retainers & keepers can be bought as “standard”, may be run on either Valve.
Every Cam has specific Springs that should be run with it, each new spring should be tested for PSI at installed height, and at full lift, tested for. Sent back if highly inconsistent, shims added underneath Springs if off slightly, an important step.
Quickly, take a straightedge & verify that the height of all the Pedestals on the bare head surfaces is consistent. Then check the tops of the Valve Stems with a straightedge, if you had it setup to be equal Valve length, the straightedge should reflect that, no gaps or Valves, nor spring retainers higher than the other.
-No, if there’s something that’s 0.300
too long, Rocker won’t come down far enough to be bolted solid to the Head, i’m Not aware of a Casting that was ever that far off. Typical issues:
1) potentially a Valve installed that’s longer than the others. A mixup.Did.the Shop griund Valve Stem tips? Possible you accidentally had a valve hit a piston and bend?
2) A Valve seat that was installed incorrectly.
3) Rocker is different in some dimension, Bolt not the same length as other’s?
4) Doubtful, an abnormally ground cam lobe, or -for overall pushrod shortness, Cam is ground on a smaller base circle. Which Cylinder/Valve is this?Still GT40 KR-1 Cam?
5) A component that was grabbed in error, Pushrod, Lifter, lash cap not used on one cylinder.
6) A Rocker Trunnion is upside down, or the Trunnions radial Block that affixes the Rocker to the u-channel height dimension incorrect. I know you’ve tried other Rockers, just being extra cautious.;
You may be able something by doing the tests below. Sure there’s a logical
Explanation. This is a different block, is it possibly a flat Tappet block converted to a Roller Block? That would explain Pushrods being short.
Pic verifying Pedestal mounts are reasonably level with each other using a straightedge, you’ll spot something unusual right off the bat. Pre-Geometry Checks.
Lining up Rocker centers and marking once you have light springs, solid lifter, this works well & gets Geometry very close in a SBF.
Line connecting the two center lines, 50% of full lift, checker Springs, solid lifters, pushrod checker will allow you to check Geometry and get it right without concern of P/V clearance. Verify 100% the Piston of the Valve you check first ( #1 Intake) is at BDC, only connect ONE pushrod- the Checker pushrod (!Check AGAIN to again, ensure this Cylinder’s Piston is at BDC!). Rotate the Cam Gear, checker should easily be able to check with the very light springs; w/Solid lifter.
Put your Mag base indicator on the Retainer, and verify max Valve lift as correct on Card, stock ratio (you’re running 1.6-correct?) I/2 of that lift-the line should be parallel with your Rocker line as marked (adjust your checker until it is). Then, clean the stem, apply non permanent/dry erase marker, see how centered you are, and how the sweep is- should be centered, and sweep total
no wider than 0.080, preferably.
.
Run a straightedge across all your Valve Stems, Rockers removed. Should be very close. Ask if any questions arise.
I channel with hardened Rocker risers w/radiuses, Shims in proper spots, if needed. Too much Shim may hang a valve open, too little will sound like a Solid, Flat Tappet Cam.lol.
Need help setting this up, just ask..
Hop this Book helps, lol
Good luck!
-John