Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#1
03-15-2009, 06:34 PM
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074 head repair
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
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1969 9566AA COPO Chevelle M-22 1969 Malibu 489 ZL-1 T-56/4.56 1969 Beaumont 540 th400 3.70 1969 Chevelle 300 Deluxe 427 ZL-1 M 22W 1970 Olds 442 W 30 2 door post 1969 Ply. GTX 426 hemi auto. Blue. 1940 Dodge pick up Durango 4X4 1968 Camaro ragtop LSA ZL1 
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#2
03-15-2009, 06:58 PM
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Re: 074 head repair
Have any good pics of them?
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#3
03-15-2009, 07:24 PM
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Re: 074 head repair
[ 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
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1969 9566AA COPO Chevelle M-22 1969 Malibu 489 ZL-1 T-56/4.56 1969 Beaumont 540 th400 3.70 1969 Chevelle 300 Deluxe 427 ZL-1 M 22W 1970 Olds 442 W 30 2 door post 1969 Ply. GTX 426 hemi auto. Blue. 1940 Dodge pick up Durango 4X4 1968 Camaro ragtop LSA ZL1
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#4
03-15-2009, 09:15 PM
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Re: 074 head repair
Removal of the exhaust valves may expose the problem .
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"Knowledge is good" Emil Fabor 67 L/78 Camaro SS/RS H-H,1W,2LGSR,3SL,4K,5BY. (Sold) 70 L/78 Nova M-21,Black Cherry,Sandalwood Int. 09 Pontiac G8 GT Premium,Sport,Roof. Liquid Red.
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#5
03-16-2009, 01:25 AM
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Re: 074 head repair
[ QUOTE ]
Removal of the exhaust valves may expose the problem . [/ QUOTE ] induction/exhaust is fine//problem is in the water jacket/heay crossover
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1969 9566AA COPO Chevelle M-22 1969 Malibu 489 ZL-1 T-56/4.56 1969 Beaumont 540 th400 3.70 1969 Chevelle 300 Deluxe 427 ZL-1 M 22W 1970 Olds 442 W 30 2 door post 1969 Ply. GTX 426 hemi auto. Blue. 1940 Dodge pick up Durango 4X4 1968 Camaro ragtop LSA ZL1
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#6
03-15-2009, 09:37 PM
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Re: 074 head repair
I'm starting to think you should have
left the 307 in it 
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#7
03-15-2009, 11:42 PM
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Re: 074 head repair
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
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69 COPO Camaro
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#8
03-16-2009, 02:24 AM
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Re: 074 head repair
[ 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..
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#9
03-16-2009, 01:26 AM
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Re: 074 head repair
[ QUOTE ]
I'm starting to think you should have left the 307 in it [/ QUOTE ] NO WAY!!
__________________
1969 9566AA COPO Chevelle M-22 1969 Malibu 489 ZL-1 T-56/4.56 1969 Beaumont 540 th400 3.70 1969 Chevelle 300 Deluxe 427 ZL-1 M 22W 1970 Olds 442 W 30 2 door post 1969 Ply. GTX 426 hemi auto. Blue. 1940 Dodge pick up Durango 4X4 1968 Camaro ragtop LSA ZL1
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#10
03-16-2009, 01:29 AM
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Re: 074 head repair
Could someone have opened up the water jacket to heat riser area on purpose for some reason?
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