074 head repair

[Alss]

In my other post regarding oil pressure in my ZL-1 it has been determined that my heads are also in trouble. Water can enter both heat crossover chambers on the heads..this is not good..can this be repaired? The heads will have to come off,.. but the motor is out so now would be a good time. I can feel the hole between the two chambers ..I can do this on both heads if I stick a bent wire just beyond view in the heat port..I was thinking about filling the passage up enough to cover the break using block grout/concrete..may only be the size of a golf ball when done..anyone have experience with this..Thanks


ALbert

[beater68427]

Have any good pics of them?

[SSRSBOB]

These guys do excellent aluminum repair. Have a pair of 842's that were in serious trouble. Now they are working fine.

Bob

http://www.z28camaro.com/restosvcs.html#Block

[Alss]

[ QUOTE ]
These guys do excellent aluminum repair. Have a pair of 842's that were in serious trouble. Now they are working fine.

Bob



I know Jerry's work very well..trying to find a "home" cure if possible to save time..Thanks

ALbert

http://www.z28camaro.com/restosvcs.html#Block

[/ QUOTE ]

[Alss]

[ QUOTE ]
Have any good pics of them?

[/ QUOTE ]

no pics as they are still bolted to the block and the piercing into the water passage is on the blind side of the heat crossover curve..I can feel it buyt not see it at least from the intake runner side..maybe after I pull the heads off

ALbert

[L78steve]

Removal of the exhaust valves may expose the problem .

[Bill Rose]

I'm starting to think you should have
left the 307 in it http://www.yenko.net/ubbthreads/images/graemlins/rolleyes.gif

[elonblock]

Albert,

Depending (which is a big if) on what type of damage you have, as a "home" cure option you can use a high quality epoxy like Marinetex.

I used to work at a cylinder head shop where the guys porting the heads would accidentally grind into a water jacket or breakthrough a port.

We saved a lot of heads using epoxy.It takes some practice to fill the hole and grind/smooth it down. And it can be done with good results.

As a plan B, we had a guy who could really weld aluminum like a magician.

Can you have your machinist take a look at the heads and get an idea of exactly what you are dealing with?

Elon

[Alss]

[ QUOTE ]
Removal of the exhaust valves may expose the problem .

[/ QUOTE ]

induction/exhaust is fine//problem is in the water jacket/heay crossover

[Alss]

[ QUOTE ]
I'm starting to think you should have
left the 307 in it http://www.yenko.net/ubbthreads/images/graemlins/rolleyes.gif

[/ QUOTE ]

NO WAY!!

[SuperNovaSS]

Could someone have opened up the water jacket to heat riser area on purpose for some reason?

[Alss]

[ QUOTE ]
Could someone have opened up the water jacket to heat riser area on purpose for some reason?

[/ QUOTE ]

that thought crossed my mind..but why?? also how would that efect the function of the head??..water crosses over the front and rear of the manifold why not once in the middle?..or why not block the crossover and let the crossover remain dry??..someone has to know..not my strong area.

[Bill Rose]

[ QUOTE ]
[ QUOTE ]
I'm starting to think you should have
left the 307 in it http://www.yenko.net/ubbthreads/images/graemlins/rolleyes.gif

[/ QUOTE ]

NO WAY!!

[/ QUOTE ]

Just goofin around. You guys will get it straightened out, and it will be flying around the streets here soon.

[JoeG]

[ QUOTE ]
Albert,

Depending (which is a big if) on what type of damage you have, as a "home" cure option you can use a high quality epoxy like Marinetex.

I used to work at a cylinder head shop where the guys porting the heads would accidentally grind into a water jacket or breakthrough a port.

We saved a lot of heads using epoxy.It takes some practice to fill the hole and grind/smooth it down. And it can be done with good results.

As a plan B, we had a guy who could really weld aluminum like a magician.

Can you have your machinist take a look at the heads and get an idea of exactly what you are dealing with?

Elon

[/ QUOTE ]

Ditto,he makes good sense---this is not the time to rush things.......Forget the grout..

[wheelhop]

How about that stuff that Billy ?????? something sell on the infomercials??? Mighty Putty

[Alss]

I have the name of a nearby reputable head shop (LOL) ..will call tomorrow and see what they have to say..been a tough couple of days..hope this all works out soon...thanks everyone

Albert

[Alss]

Got this from a guy on Team Chevelle..its the problem I have....

Think it could be fixed??






This was a common procedure back in the day of those heads, to put in longer rocker studs on the bottoms, and unless you were real careful you ended up drilling clean through the exhaust crossover? This is only on one stud on each head! The idea was to "double-helicoil" the original threads by drilling down deeper! Both these particular studs needed to be 'trimmed" in their respective locations before installation!

ARP still sells the stud package for these heads!

You don't say how much water was in where, but this was a very common error when working on the "074's" AND the later "077" casting as well!

[DarrenX33]

[ QUOTE ]
How about that stuff that Billy ?????? something sell on the infomercials??? Mighty Putty

[/ QUOTE ]

Funny Hanke. http://www.yenko.net/ubbthreads/images/graemlins/grin.gif

http://www.infomercialsitv.com/images/billymays.jpg

[njsteve]

I think you should fill the hole with Shamwow! It's miraculous at water absorption.

http://i466.photobucket.com/albums/rr24/nk15268b/vince_shamwow.jpg

http://www.yenko.net/ubbthreads/images/graemlins/hmmm.gif

[427king]

[ QUOTE ]
I have the name of a nearby reputable head shop (LOL

[/ QUOTE ] What shop built the motor? ...Pat Musi is right around the corner,and hes one of the best. Why put repaired heads on a 25K motor anyway if youve already had 3 problems?

[Chevy454]

IIRC, Indy Cylinder Head used to be where all the bad heads went...

[Alss]

Head is not that bad...water is in the heat crossover due to drilling the exhaust stud too deep. Spoke with several shops today and we all agree no harm in letting the water be in the heat tube..going to block it off at the manifold with a stainless plate under the intake gasket..should seal the water out of the intake and Im good to go..will keep everyone posted on how it works out..thanks

[beater68427]

[ QUOTE ]
Head is not that bad...water is in the heat crossover due to drilling the exhaust stud too deep. Spoke with several shops today and we all agree no harm in letting the water be in the heat tube..going to block it off at the manifold with a stainless plate under the intake gasket..should seal the water out of the intake and Im good to go..will keep everyone posted on how it works out..thanks

[/ QUOTE ]

Heat cross over is on the intake side, exhaust mounting flange well thats on the other side, I'm guessing your speaking of the exhaust rocker arm stud http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif I would fill the heat cross over with epoxy if this the case.

[1randy]

RAY`s CRACK REPAIR.
Ray Shepherd, owner
shop: 502-645-7444
270-358-0934
he is one of the best i have seen !!! he has fixed some heads i messed up realy bad that i thought were not repairable. been using him for 15 years.

[Harry P Hunter]

Alss: Curious how this repair worked out?

Harry P. Hunter

[Alss]

[ QUOTE ]
Alss: Curious how this repair worked out?

Harry P. Hunter

[/ QUOTE ]

so far so good..no leakages.motor is a bear!!