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Author Topic:   Repairing a SBC Head
RCRacing #08
Member
posted May 23, 2003 08:33 PM
Will it work or Not is the question?

Problem: blew a head gasket on my 350 SBC and it made a small indention on the head between the # 4 and # 6 cylinders.

Will it work to use Permatex Hi-temp Metal Repair Compound and the sand it back flat.
The compund says it is good up to 2000 degrees F and that it gets stronger with more heat.


towmandan
Member
posted May 23, 2003 10:14 PM
Bad luck strikes again....I have welded heads up before that had your problem and then resurfaced them....Ive never used the product that you mentioned but if it does what you say I dont see any problem with it at all if you dont have that big a spot to repare....Towman


dreamcatcher
Member
posted May 24, 2003 09:38 AM
i had a freind that had the same problem and used the same stuff with no luck, maybe he didnt prep it right or something , i dont know. i would recomend welding or having it welded. remeber to much heat from the welder will crack the block. good luck



Mell00
Member
posted May 24, 2003 09:55 AM
Eutectic makes several types of powder that can be applied with a tourch. If you know someone that can fill in this spot I would suggest doing that and then do a light clean up with a mill on the head. There are other materials that can be applied as well but the quick fix of a puddy is not what I would recommend. Check with a local machine shop - It won't cost too much to repair it correctly.


madmodshoe
Member
posted May 24, 2003 06:36 PM
nickel rod and then surface to fix the fire slot


RCRacing #08
Member
posted May 24, 2003 07:01 PM
so this nickel rod, is that for a stick welder? Is there any special way that you must treat the head to be able to weld the cast head?
or must it go to a machine shop?


66jj
Member
posted May 24, 2003 08:32 PM
nickel rod for a stick welder.

open the spot up enough to get some metal in there, and grind and clean it well.

use a torch to pre heat the area of the head, then weld it and peen it as it cools.....

then go to machine shop for resurface.
its not really difficult at all but if a machine shop is going to charge you 20 bucks to weld it id just have them do it.

jeff

RCRacing #08
Member
posted May 24, 2003 08:58 PM
thanks for the info, I guess I will call the machine shop on Monday and see what there price is to do the repair.



sdhnc29
Member
posted May 25, 2003 01:22 PM
Everyone is correct about the nickel rod for repairing your cylinder head . If you can find someone who can spray weld , then this would be the best repair , but pricey . The nickel rod will work just fine , and you'll probably never have a problem if it's done correctly . Make sure that the shop doing the repair will heat the cylinder head up properly before welding on it . Also be aware that one repaired properly , you will have to do a fresh valve job .

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


RCRacing #08
Member
posted May 25, 2003 03:44 PM
Steve,

To have one welded with the nickel rod, what is the normal price for the machine shop?
Why would I need to do a valve job if the problem is not near the valves?
Do you think that fill material may work? It looks good but not sure how it will do when put back together. It says it is better with the more heat that is applied to it and that it is good up too 2000 degrees F.



sdhnc29
Member
posted May 25, 2003 05:31 PM
The fill material wont work due to the fact that it will not handle combustion pressure . If you had an external problem with the head where only heat was a consideration , then perhaps it would work .

You would need a valve job on the head after it has been welded due to the fact that if it is repaired correctly , the whole head will be heated up as close to the weld temp as possible . This is so you will not have a cracking problem near the repair weld . Once the whole head is heated , the existing valve seat's tend to shift a small amount as the head heats and cools , especially in the area of the weld . Your probably looking at a maximum of $100 for the simple repair your speaking about .

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


RCRacing #08
Member
posted May 30, 2003 05:41 AM
Machine shop wants 250 to repair or 340 to replace with new head


sdhnc29
Member
posted May 30, 2003 08:53 AM
OUCH !! Evidently they are shooting for the $340 . I'd try a different shop , perhaps a honest one . There is not more than 1 hour labor in the whole repair . I can see $150 in some cases , but $240 is ridiculous .

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


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