Mustang5l5's Progress Thread - Archived Progress thread '08-'20.

Mustang5L5 · Nov 14, 2019

Got some new springs. These were from Lowe’s for $5 and are very light. They don’t push in the lifter spring at all.

Did a practice run just to see. I think 6.750” might be the number. This was 0.065” wide. Spec is 0.080” according to the TFS instructions. I just need to read up on how to factor in lifter preload

Will set it up this weekend for real, and get some pushrods in order. I need to steal the kids playdough and check PTV. I checked a few times just by depressing the valve while I spin the crank and it felt like there was plenty of space. Still...gotta check

Mustang5L5 · Nov 15, 2019

So I started checking my PTV clearance.

Used a dial indicator. Intake valve...0.030” at around 10* ATDC.

Uh oh

I’ll need to grab some clay and double check.

Mustang5L5 · Nov 15, 2019

Haven’t checked exhaust side yet. Will do in a bit.

Playdough method to follow

Edit: exhaust side has way more clearance. Easily over 0.150” so I didn’t tske a specific measurement

Gotta clay it next. Could be radial interference on the intake

Mustang5L5 · Nov 15, 2019

Ok. Wife put the kiddos to bed so I had more time to properly set it up and measure using dial indicator

Exhaust side clears by a mile so I only ran those numbers once.

Intake side I set up three times and got repeatable results. Looks like closest approach is around 10 ATDC at roughly 0.060”

I’m off technically 0.015” but I’ll through some fudge factor in so call it 0.020”

I still need to clay it. Also, I’m running my old factory HG under the head. I’ll have to measure it’s thibkness compared to the 9333pt1.

But what to do over 0.020”? Thicker head gasket?

HotFox · Nov 15, 2019

Your sure that soft spring is not hanging open or not following the cam profile? Have had that happen in the past, that is reason why those mock up springs are a bit stiffer.

HotFox · Nov 15, 2019

Also you sure that cam is degreed right? I'm suprising Ed would not have that exhaust valve opening sooner which would create more clearence on the intake side.

Steel1 · Nov 15, 2019

Forged or hyper pistons ?
I would put the 9333pt1 gasket and regular springs on it and measure again.
Also do you know your quench number , thicker head gaskets could make that less than desirable.

Mustang5L5 · Nov 16, 2019

HotFox said:
Your sure that soft spring is not hanging open or not following the cam profile? Have had that happen in the past, that is reason why those mock up springs are a bit stiffer.

Thought crossed my mind. I’ll rerun it with the correct gasket torqued down, the stiffer springs, and mock solids. It’s a good point considering I measured 0.030” during my quick check earlier that evening. I only need 0.015” to feel better, but I’ll likely check other cylinders as well

HotFox said:
Also you sure that cam is degreed right? I'm suprising Ed would not have that exhaust valve opening sooner which would create more clearence on the intake side.

I degreed it twice, breaking it down in between. ICL was to be 107 and I got 106.5 And all the events lined up fine. But now I want to check a 3rd time. Just need to fabricate something to mount degree wheel on crank.

Steel1 said:
Forged or hyper pistons ?
I would put the 9333pt1 gasket and regular springs on it and measure again.
Also do you know your quench number , thicker head gaskets could make that less than desirable.

Stock ‘88 forged pistons, so 0.010” in the hole? The 9333pt1 is 0.047” compressed so if anything I really should go thinner? But the stock gasket is 0.040” so is quench that bad from the factory?

Steel1 · Nov 16, 2019

Mustang5L5 said:
Stock ‘88 forged pistons, so 0.010” in the hole? The 9333pt1 is 0.047” compressed so if anything I really should go thinner? But the stock gasket is 0.040” so is quench that bad from the factory?

Not uncommon for older smog engines to have a lousy quench, so I wouldn't be surprised.
Going with a thinner gasket would only make your ptv clearance issue worse.
Calculate your quench as it sits now just for reference.
I believe good quench rule of thumb for a street motor with steel rods is 0.038"-0.043", I ended up at 0.039".

Mustang5L5 · Nov 16, 2019

Best estimate is that pistons are equal to deck height. I measured three and found them around 0.000”-0.003”. I found published data suggesting 0.008-0.0013” below was typical, but I’m not seeing it here. I see less.

Original head gasket measured out around 0.045”. I’ll need to sacrifice one of the 9333s and torque it down when i measure next. I need to be 100% sure.

Quence with the 9333s would be 0.047” + 0.003” giving me 0.050” quench which might be a tad high.

I’ll reset the stiffer checker springs and mock solids and recheck. The light springs didn’t collapse the lifters but the checker springs do

Not gonna lie...a little bummed. But everything can be solved. Just a matter of money and where to throw it

Steel1 · Nov 16, 2019

Mustang5L5 said:
Best estimate is that pistons are equal to deck height. I measured three and found them around 0.000”-0.003”. I found published data suggesting 0.008-0.0013” below was typical, but I’m not seeing it here. I see less.

Original head gasket measured out around 0.045”. I’ll need to sacrifice one of the 9333s and torque it down when i measure next. I need to be 100% sure.

Quence with the 9333s would be 0.047” + 0.003” giving me 0.050” quench which might be a tad high.

I’ll reset the stiffer checker springs and mock solids and recheck. The light springs didn’t collapse the lifters but the checker springs do

Not gonna lie...a little bummed. But everything can be solved. Just a matter of money and where to throw it

Don't get too down yet there should be some reasonable options to solve it.
I'm going to go out into my freezing garage later...lol and see if I can find what my final ptv was
just for reference.
My pistons were .008" - .009" out of the hole due to shorter deck height and decking of my 69 block
but was able to get good numbers with the correct dish. Also bumped compression nicely.....more powwwaaaa !

Mustang5L5 · Nov 16, 2019

Checker springs, solid lifters, 9333hg snugged down...not much difference

Gotta clay it

Mustang5L5 · Nov 16, 2019

Exhaust valve never really gets close. Here’s the intake valve. On my Caliper it measures pretty damn close to 0.080”

Mustang5L5 · Nov 16, 2019

Repeated it. Exhaust way away so I’ll disregard measuring it from here out. Intake close to face.

Gonna degree the cam again just to be sure. I’ll need to rig something to mount my wheel off the balancer since my front dress is installed (jumped the gun there)

Foxslider · Nov 16, 2019

Looks good to me. Run it. Lol.

67coupe · Nov 16, 2019

I’d contact Ed. It’s a custom cam for your combo. He’s probably done 100’s if not 1000’s of 5.0 cams. He’ll know if something is amiss.

Mustang5L5 · Nov 16, 2019

Gonna re degree it first. After I degreed it I pulled the timing chain off to mess with something. I’ll kick myself if I installed it off a tooth.

Just need to rig something up to mount my wheel on the crank pulley first since I put that together

I’m 99% sure it’s correct though

Steel1 · Nov 16, 2019

If that measurement turns out to be correct I'd be comfortable running .080" intake side on a steel rodded street car.

Mustang5L5 · Nov 17, 2019

Well, after googling all night I’m gonna send it. I’m coming to recheck my cam timing first to make sure that’s on, and clay the other pistons as well. I also got confirmation from Ed that I should be good.

My springs I’ll end up running should be stiffer and cause some deflection in my valvetrain which might add 0.020-0.030 to my clearance. That would put me in the generally acceptable zone. This isn’t a high revving race motor as your know

But like I said, I’ll triple check this all and then button it up.

HotFox · Nov 17, 2019

Now wonder the intake is so big it does not even come to the original valve reliefs. So in theory you could run a flat top piston.

Mustang5l5's Progress Thread - Archived Progress thread '08-'20.

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