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?

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.

Lorena, Texas (South of Waco)

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.

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.

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.

Paul

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.

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.


Lawrenceville, GA

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.   

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

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.

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.   

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.