Starting a rebuild, next phase

[Beaus67]

Got the engine out on the stand and somewhat apart today, did a few measurements – that’s enough for one day. Pistons had so much build up I thought the block had already been zero decked. Once I cleaned them off, each piston had a .025 deck height (all I had was a feeler gauge but it seemed adequate, wasn't any question which gauge fit) so based on the deck height of .025 this block must be fairly unmolested. The head is another matter, really glad I went with a "large head"

Hard to believe these plugs have less than 3000 miles

Pistons hade heavy carbon build up

water jackets 1,2,3,5 pluged by hed gasket (just had small holes)

Finally on the stand, done for today!

 

[CZLN6]

Howdy back Bill:

What is the casting code on the head? It appears to have a two step ledge in the chambers opposite the plugs. Very interesting. Your new head will definitely have a higher ratio of quench to bore. The gasket appears to have a copper color? Is it an OEM steel shim gasket?

You've sure had a good day. Take lots of photos and take your time.

Adios, David

 

[nickstewartroc]

Looks like where i'm at! Great job it looks like so far!

 

[Beaus67]

Dave here are some photos, so what do you think is this head unique in that feature?

Also a casting # "6L2" to the left of this

Red valve springs?

Is it an OEM steel shim gasket? I have no idea (no frame of referance)

 

[CZLN6]

Howdy Back:

The combustion chambers are somewhat unique. I don't recall ever seeing a "G" suffix casting. Very interesting. Could I ask you to cc a chamber or two, please. I'm curious.

The gasket should have some imprinted lettering on it. The coppery color is throwing me. Look it over very carefully. printing should be on the front end on top. Thanks, In advance.

Adios, David

 

[Beaus67]

Happened to be working on the motor, so I measured 3 combustion chambers - 1, 5, 6 and I got 52cc, 52cc, 52cc. I also went over the head gasket with a magnifying glass (both sides) there is not one letter, number or symbol on the thing. It seems to be made of steel with a copper colored coating on both sides. I measured it for thickness (using a flat surface and a feeler gauge) and it measured .045 which indicates it’s an aftermarket gasket whose manufacture is not proud enough to label. Ford was stressed to fill demand for Mustangs and this engine went into about everything they built, could it be multiple foundries building parts in slightly different ways? Assuming this is the cars original engine it was built about mid year in their production cycle (January) although I dont know why that would change anything, just some thoughts, I’m interested to hear your opinion.

Thanks Bill

 

[Beaus67]

After a little investigation I have discovered the G suffix indicates the 7th (G being the 7th letter in the alphabet) engineering version of this part. Those raised areas may have been the only change to the last version but would have required a “version suffix” change. Even as I type this I am realizing you probably already knew that.

Bill

so far so good

 

[CZLN6]

Howdy back:

You're right. Strange things happened at FoMoCo in those years. Yes, the "G" indicates an engineering revision code and it could be for something very minor. Very few code changes are obvious. On the head gasket, strange things happen in the forty-three year life of this vehicle. Very seldom is a complete history of mechanical issues recorded, so in the end, we may never know. But it is interesting. And thanks for looking.

Keep on keeping on.

Adios, David

 

[bubba22349]

C7DE6090-G also a casting # "6L2" to the left of this

6L2 would indicate the head was cast on November 2, 1966 this would be off an early production car.

 

[JackFish]

Is it an OEM steel shim gasket? I have no idea (no frame of referance)

No, it is not a steel shim gasket.

 

[Beaus67]

Thanks JackFish, I was pretty sure it wasn't based on its thickness. On the gasket I took off and the one in your picture 4 of the water ports simply have a small hole in them, what is that all about? The block and the head are both wide open in these areas, I thought my gasket had been plugged but based on your picture it’s designed in.

Bill