Hardening Aluminium Heads 427 SOHC

[Loco1234]

HI guys,
I know this may be a little off topic but does anyone have any suggestions as to where I can get my Aluminium 427 SOHC Heads Hardened?

I had a NOS rocker arm crack which cause a valve to snap and obliously cylinder head problems.

Now I have purchased a new set of rocker arms that have more than 5X the tensile strength. and have an engine builder that can reassemble the motor as required but it has been suggested to me that I should look into hardening the heads. They are Hubert Platts original drag race heads.

[Zack]

Google man, google

[Breadfan]

Might want to look for places that can do cryogenic treatment/cryogenic processing/tempering.

Google "cryogenic treatment" there are a number of places that do this service that pop up, I've not dealt with any of them so cannot recommend anyone in particular.

[crouse]

What car does this sock motor go in?

[Loco1234]

Might want to look for places that can do cryogenic treatment/cryogenic processing/tempering.

Google "cryogenic treatment" there are a number of places that do this service that pop up, I've not dealt with any of them so cannot recommend anyone in particular.


I've already contacted the place both Fordnut and myself used to Telfon coat, and ceramic coat our pistons...
They also did all of Fordnuts cyro work.... which was alot... unfortunately they are not capable of doing this....


a very important thing to remember is it can't just be froozen because the cam tower have to be kept straight or further issuses will occur...

[Breadfan]

I gotcha - what sort of hardening techniques then exist that don't cool or heat the metal? Any chemical alternatives?

[Loco1234]

Google man, google

I searched yesterday but wanna make sure I go with someone I trust...
Cam tower and cyro get tricky...
I am hoping someone can provide me with a lead...

Hell if someone knows an engine builder that is familar with the cammer and drag race preping it... such as hardening I'd have them do it all....

[Loco1234]

I gotcha - what sort of hardening techniques then exist that don't cool or heat the metal? Any chemical alternatives?

The cyro place I already spoke to mentioned Nitrate treatment but soon said nevermind...
so Im stumped... hence me asking 4 help...

the head has some CC damage (i used a bore a scope)
It will need repair.. after the repairs it was suggested to me by the orignal builder that used to work at Carroll Shelby's factory that I should have heads hardened.. but...
has no clue how in this day in age could do such a thing...

FYI: the cammer motor is out of a 65 AC Shebly Cobra that is a 1 0f 2 have the racing frame (thicker frame) but was custimezed to have a glass roadster body outfitted to it...
I've heard it was done to treaten AC when the sheetmetal quality was going down and the covette was flauting glass...

[Loco1234]

What car does this sock motor go in?

Photos will soon be posted for ya...

here ya go the motor coming out and the broken rocker...SOB
The rims are a 1of1 set from Byod Coddington. It took 3 tries to get the offsetting right to fit the new Wilwood 6 piston (Nascar Wigth) brakes and rotors on the restmod.

http://i120.photobucket.com/albums/o191/Loco4321/Cammer%20Cobra/PIC-00124.jpg
http://i120.photobucket.com/albums/o191/Loco4321/Cammer%20Cobra/PIC-00125.jpg
http://i120.photobucket.com/albums/o191/Loco4321/Cammer%20Cobra/PIC-00135.jpg

[MitchB]

I think what you want to do is have the heads heat treated. To achieve this, I believe you have to heat the head in an oven at something like 850 - 950 degrees farenhiet for a prescribed amount of time, allowing them to cool at a specific rate. Maybe you want achieve something like a T-6 heat treat. I think it would be a good idea to check the camshaft line bore afterwards.

Mitch

[Mad4Macs]

HI guys,
I know this may be a little off topic but does anyone have any suggestions as to where I can get my Aluminium 427 SOHC Heads Hardened?


You wanted "hardened"? GIVE THEM TO ME!!!!"

:banana:

[FordNut]

If Evans won't cryo-treat them I only see one option. Have the repairs and machining done, then have them hard anodized.

For sure have the new rockers cryo'd though.

[teamrope]

Give Dan Ferraro a call. (253) 582-1563. He has a Cryo-tank.

Clear Image Automotive (http://clearimageautomotive.com/)

[GreekGod]

...Keith Craft will know where to go for help. I thought all Cobra owners knew him?

[Loco1234]

...Keith Craft will know where to go for help. I thought all Cobra owners knew him?

I will call them today....

[prchrman]

I cannot address the cryo thing but what I can tell you is that doing any solution treating and reaging aluminum you run the risk of warping the heads...a real solution T6 or T7 needs a min of 1000 degrees for 10 hours and then be quenched in water within 10 sec of leaving the solution oven and then be artificially aged for 3.5 to 5.5 hours in 350 degree temperature to get the best hardness, enlongation and tensile strength...to do all this to a machined part you run a big risk of warpage...OBTW after several hours of running on a motor they tend to get soft again depending on alloy...I do this every day of the week in a production mode and I would not do this to any of my aluminum machined parts without doing a dimensional check and then you will run out of machine stock on most applications if it warps...hope this helps...willie

[Loco1234]

I cannot address the cryo thing but what I can tell you is that doing any solution treating and reaging aluminum you run the risk of warping the heads...a real solution T6 or T7 needs a min of 1000 degrees for 10 hours and then be quenched in water within 10 sec of leaving the solution oven and then be artificially aged for 3.5 to 5.5 hours in 350 degree temperature to get the best hardness, enlongation and tensile strength...to do all this to a machined part you run a big risk of warpage...OBTW after several hours of running on a motor they tend to get soft again depending on alloy...I do this every day of the week in a production mode and I would not do this to any of my aluminum machined parts without doing a dimensional check and then you will run out of machine stock on most applications if it warps...hope this helps...willie


No,
thank you very much for your input... I will discuss this with the engine builder/head repairer..... I knew the cam towers may be an issuse but this certainly makes it sounds not worth it... esspecially if it's only gonna soffen soon after being installed and ran on the motor....

Do u have any suggestions for after or during the aluminium head repair.. I believe the damaged area will be filed will an aluminium weld then ground to shape....

[prchrman]

When we weld machined parts we keep it as mininum as possible and only weld on parts that are non production items like proto type models to test for horse power and such...we do not reage or solution the part after welding...your repair guys might have a method for treating the welded part but I cannot help with any suggestions...sorry about the delay on this answer but been busy all weekend...willie

[Loco1234]

When we weld machined parts we keep it as mininum as possible and only weld on parts that are non production items like proto type models to test for horse power and such...we do not reage or solution the part after welding...your repair guys might have a method for treating the welded part but I cannot help with any suggestions...sorry about the delay on this answer but been busy all weekend...willie

hey no problem...
This is something that is being taken very seriously and NO desicion will be made without extensive research. I apprecaite the wealth of knowledge you have brougthen to the table though...

I really am considering just having the head repair done....