Broken Valve Spring

[eschaider]

OP,

The studs in your head seem to have a close fit to their associated stud holes in the head. Attempting to get the head off by prying on any edge will just jamb the head with the studs and you won't get anywhere. You need to find a way to get the studs out and the head will likely just lift off. Your idea of thin jam nuts might be a good solution.

My suggestion would be to pull the engine, put it on an engine stand and the job will become much easier. When you do get it apart consider buying some broached ARP studs for the new engine so you can easily install and remove the studs with an allen wrench.


Ed

[bobcowan]

I dropped a valve on the race track one day. Since it was a Dart block, it only took a week to get it running again.

[eschaider]

Very thorough component failure there, Bob.


Ed

[Jerry Clayton]

Pi x R squared equals the piston area for fiquring the lifting pressure -------example--------a 4 inch bore size would be R = 2------ soooo 2 x2 x 3.14 = 1256 x 100 psi = 125600 lbs total force------


The aluminum heads -the washers under the nuts have squeased the alum head material into the threaded area of the stud which will keep the head tight against the block----There are step washers available that do require clearancing but will prevent that------

[patrickt]

Originally Posted by Jerry Clayton

Pi x R squared equals the piston area for fiquring the lifting pressure -------example--------a 4 inch bore size would be R = 2------ soooo 2 x2 x 3.14 = 1256 x 100 psi = 125600 lbs total force------

Gaz doesn't believe you. He says that anyone old enough to have raced back when you did has to have at least two toes in dementia now.

[patty442]

jerry check your math. 2 x 2 x 3.14. = not 1256

[cycleguy55]

Originally Posted by Jerry Clayton

Pi x R squared equals the piston area for fiquring the lifting pressure -------example--------a 4 inch bore size would be R = 2------ soooo 2 x2 x 3.14 = 1256 x 100 psi = 125600 lbs total force------


The aluminum heads -the washers under the nuts have squeased the alum head material into the threaded area of the stud which will keep the head tight against the block----There are step washers available that do require clearancing but will prevent that------

Uh, that would be 12.56 in², not 1,256 - so 1,256 lbs. force @ 100 PSI.

460 CID standard bore is 4.36", so (4.36 ÷ 2)² x 3.14159 = 4.7524 x 3.14159 = 14.93 in² x 100 PSI = 1,493 lbs.

My earlier numbers were incorrect.

[Gaz64]

I would now get a borescope camera to look at the piston top.

If the bore or piston is damaged, then that negates the need to try and pull the head in situ.

[Jerry Clayton]

OK guys-I did that specificatly so some of you would get in here with the idea of what and how it works out----yes, it is 12.56 square inches on a 4 inch bore and then multiply by the PSI gives you the total force of 1256 lbs------
Now maybe you'll get the idea that maybe 15 to 1 compression can cause bent rods?????

[sunman]

Connect the rocker studs with a metal piece with a 3ed hole over the stud. Use an nut and bolt with bolt head over stud and push the head off like a balancer puller. Put the threads up thru the hole, put the bolt head on stud and turn the nut to apply pressure.
Edit: If you have a puller that fits studs use it

[Jerry Clayton]

BHJ products ( makers of torque plates) have a product line of "T washers" they are for aluminum heads and you use a stepped relief cutter that counter bores the top of the bolt hole in the heads for the relief for the T----this keeps the washer from squeesing the alum into the threads of the stud-------

[LG57]

Seems like you have no choice but to pull the engine to complete the teardown. You'll have to have the engine out in order to repair the damage anyway. Time to bite the bullet pull it out of there!

[Jerry Clayton]

The washers for the block studs need to be a bigger diameter so as to have more contact area with the aluminum -----

[jknich]

Maybe without the washers you can use two jam nuts and remove the studs?

[Jerry Clayton]

Snap on has a stud removal/install kit-CG-500 Stud remover------

[767Jockey]

This Gear Wrench stud removal kit is only $50.

https://www.amazon.com/GEARWRENCH-41.../dp/B000K1KHB6

[splenderleith]

Quick update: I got the head loose. It was just the dowels holding it in place. Once I got it wiggling, it came (almost) off pretty easily. The biggest issue I am facing is the head hits the passengers toe box before it clears the studs. I broke the stud loose that is closest to the interference area. I can’t unthread the stud far enough to remove it. I am considering backing it out as far as possible, then cutting it off and threading it back in far enough to remove the head. The other option would be to try to get the motor up a couple inches.

I would love to lift the engine a little? But I am not sure if I can do it without any kind of cherry pucker. I think 1” may be enough.

[cycleguy55]

I'd unbolt the motor mount on that side and jack the engine up enough to roll it a bit more upright and provide enough clearance to remove the head.

[eschaider]

Henry Ford once said, "If you need a machine and don't buy it, you will ultimately find that you have paid for — and don't have it!

OP, this is you in spades! On two different levels.

First,

That engine is not repairable in the car. Pull the engine and fix it!

Second,

Dicking around with all this touchy feely how bad is it hurt discovery stuff is the equivalent of needing the machine and not buying it!

In the end you will not have fixed the engine, still need to fix the engine and now have to begin the process of removal and repair.

Skip all the BS, pull the engine, clean the good parts, trash the bad parts, buy replacement parts and repair your engine!


Ed

[Dominik]

Well done on getting the head off. Had a stubborn Jaguar XJ6 head which took 3 days to pry off.

As above, do yourself a favour and take the engine out. Perhaps find an engine builder. You can do it yourself. Many others did, but do you really want to?

You might find an oddball piston, deck height, pin height, bob weight combo which will make you despair.