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By scott5560 - 13 Years Ago
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Motor back in truck and number 6 filled with water GREAT. Thinkin ready to start lol merry christmas GRRRR. After spending $700 on heads. They are ECZ-C heads which I roughly measured at 72cc so stock? Had 0.040" taken off to up comp. And now this. Can this be repaired? Welding? Is this a fluke? Its right at the edge of the firing ring. Or is 0.040 to much for C heads?
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By Ted - 13 Years Ago
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Taking 0.040” off of the ECZ-C heads shouldn’t be a problem assuming they were unmilled heads to begin with. Probably need more detail or pictures but let’s talk head bolts. Did you check that your head bolts are not bottoming out in their holes? You didn’t give much detail on the year engine being worked on but ’57 and on had two different length head bolts on the top row. Outer bolts are longer than the three inner bolts. If the long bolts are put in the center holes, then the bolts bottom out before full crush is put on the head gasket.
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By scott5560 - 13 Years Ago
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Here is one pic can only do one at a time as too big. Figured at 72cc should be stock? And told machine shop wanted 66cc chamber for my 9:1 comp. The block is C2AE and heads ECZ-C from my 56 f100.
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By scott5560 - 13 Years Ago
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Other pic is too big to upload on this forum. This is a heart breaker the heads already have all the work done. Worried about other head and if it hydraulic locked and bent rod etc.
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By PF Arcand - 13 Years Ago
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Were the heads previously used for salt water marine use by chance? It appears the head may be badly corroded inside? Did you check the protuding corner of the heads for thickness before millling ? They may have been milled before & would be close to 1" thick originally... Cast welding is possible if the corroded spot is localized, but is tricky & likely expensive. Maybe someone else here will chime in with another solution.
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By scott5560 - 13 Years Ago
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No not used for marine use. Supposed to be the original motor for this canadian truck. Has canadian cast block by numbers. Was there different heads for canada? Does anyone know the stock chamber size for ECZ-C heads? I measured at 72cc before milling. Figured was stock.
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By charliemccraney - 13 Years Ago
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If the block is C2AE, it's not the original motor.
I think you'll have to start over with the heads. Maybe try a different shop. The pictured head was not milled; if .040" was taken off, it didn't happen recently. It doesn't look like much was done with them. They should have seen that hole and notified you before doing any work. It does not look like $700 worth of work to me.
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By 46yblock - 13 Years Ago
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Ouch! No need to check for bottoming head bolts now  . I totally agree, the head in the picture has not been milled anytime recently. That has to be sickening. What did the shop do to justify the $700? It hasnt even been freshly cleaned. Pull an exhaust valve and see if seats were installed, seats and valves ground. Something is fishy. The C heads had 73 cc chambers originally. Sunken seats from wear and multiple valve jobs can add to that number on a head with original surface.
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By scott5560 - 13 Years Ago
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I have the original block on a stand had the C2AE block prepped checked, squared and bored already then used the heads off original motor. The surface of the head had the Permatex Copper Coat spray residue left on it as I used copper layer head gaskets. The heads had radius valve job, guides cut for positive seals, hardened seats, new ex valves, and skimmed 40thou.
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By 46yblock - 13 Years Ago
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It sounds like the heads were done then run on the original block, giving the used vs. machined appearance. With .040 off, maybe more from previous work, and assuming the block was decked too, the intake fit would be questionable without material taken from the head intake flanges. No matter now.
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By John Mummert - 13 Years Ago
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I would say the first thing you need to determine, was the hole caused by rot or was this a stray glob of sand during the casting process that caused a single thin spot.
If the head is generically rotted in the water passages then it isn't worth messing with.
If it is a localized thin spot it could be pinned or welded. Welding might be a better repair but a lot of shops won't surface the head after welding. The hard spots can destroy an expensive cutter.
A pin repair might fix it and the cast iron pins are easily machined.
Worst case you can re-use the valves, springs ect. ECZ-C heads are not terribly valuable. Maybe the shop would work with you on the cost of seat and guide work.
I wouldn't say the hole is their fault, we generally surface the heads after the seat and guide work so the deck doesn't get scratched. It has been said the shop should have noticed the hole but the installer didn't see it either.
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By scott5560 - 13 Years Ago
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No I not blaming the machine shop at all. I never even thought this would be an issue really from my research. I believe the machine shops work. I was in touch and saw the heads as work progressed. Just wondering if should try fixing. Thanks John. I am a japanese motorcycle mechanic so the stuff I build usually is all aluminum and you just change base gaskets and head gaskets etc. for changing squish. And porting and cam timing usually builds a strong motor. So building a V8 is new to me. Its old but new. Ted or Tim any experience with this problem or insight on your end.
Thanks
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By Hoosier Hurricane - 13 Years Ago
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Scott: You could possibly fix it yourself. Drill progressively larger holes through the damage until you feel you have enough meat to thread, then drill and tap for the next bigger pipe plug, and screw in a cast iron pipe plug from your local plumbing supply or hardware store. Cut/grind it flush with the head surface and you are good to go. You have nothing to lose at this point.
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By scott5560 - 13 Years Ago
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Got the head back. Took it back to the machine shop. Don't blame him at all. It was a casting flaw that could be felt on the backside in the water jacket. Think it blew through once comp was on it. He sent it out for repair was $200 + shipping - surfaced cleaned oiled (wd-40) by smell lol. Had too look for wear it was. Back together now up and running :-)
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By scott5560 - 13 Years Ago
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Here is a pic
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By pegleg - 13 Years Ago
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Cost some money but much better than scrapping the head!
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