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Old 05-05-2013, 06:18 PM
the youngone
 

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block casting

hiii all.

today i buy a block for cheap. ists i think a 350 with dome pistos, but im not sure ,

i think maybe the casting is 3970814
or 3870844

i cant realy see it good.. i tryd to send a ic but it dont work


thnx

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Old 05-05-2013, 06:54 PM
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You can cruise these sites, but I didn't see anything with that number.

Chevy VIN, Trim Tag and Drivetrain Information & Decoding

Chevy Casting Number identification - Block casting numbers
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Old 05-05-2013, 07:59 PM
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3970014 3970014 68-79 350 car & Truck 2 & 4-Bolt
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Old 05-05-2013, 11:51 PM
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Okay are they good blocks,?
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Old 05-06-2013, 05:30 PM
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questions

today worked on the engine .

its an old engine from a friend of mine he has it in his garage for a few years. and i think by rain and the weather the walls are a little brown from rust.
can i fix it ? and how..

also the pistons had the springs in i and they are stick int he pistons. i finally got them out .. but are the pistons reuiseble.. and how can i fix that. ... also can anyone tell what type of pistons it are . thnx!
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Old 05-06-2013, 05:34 PM
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pics

and can u guys see of the block is milled.. its looks like a milling pattern ..? can i chek is its already bored over?
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Old 05-06-2013, 06:24 PM
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Block is as good as any 68-78 block. Yes it has been decked. Stock production blocks are broached. That leaves scratches from front to back. Aftermkt shops usually use a rotary type milling machine. Leaves circular or top to bottom marks. Yours was cut on an insert blade type cutter. Piston oversizes are usuallu on the top surface. If piston is not marked. You will need a vernier caliper or similar measuring device.

From the top view, pistons look like old TRW or Speed Pro/Federal Mogul .
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Old 05-06-2013, 08:56 PM
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Quote:
Originally Posted by Wezz View Post
and can u guys see of the block is milled.. its looks like a milling pattern ..? can i chek is its already bored over?
Do you own a dial caliper? If not, find a Brown & Sharpe, Mitutoyo or Starrett 6 inch caliper on ebay. I have bought used ones there before for around U.S.$80. Once you have one, you will use it every day for the rest of your life.
Here's an example.....
Starrett 6" Dial Caliper w Case | eBay

Resist the temptation to buy a digital caliper. Every time you reach for it, the batteries will be dead. A dial caliper is bulletproof. Also resist the temptation to purchase a lesser quality Chinese-made caliper. I have Starrett and Brown & Sharpe tools that I've been using for over 50 years.
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Old 05-06-2013, 09:45 PM
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"Resist the temptation to buy a digital caliper. Every time you reach for it, the batteries will be dead. A dial caliper is bulletproof. Also resist the temptation to purchase a lesser quality Chinese-made caliper. I have Starrett and Brown & Sharpe tools that I've been using for over 50 years."

Yes,,bbbut how about us old guys that can't see well anymore!!
I carry a Mitto digital so I can see the darned thing. Besides the metric conversion is just a thumb touch away.
I keep a spare battery in my billfold and toolbox...
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Old 05-06-2013, 09:57 PM
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Bob

Maybe you're a bit older than me. I had to laugh when I read your post. I got a dial caliper because I got to needing a flashlight and magnifieing glass to read a vernier. Getting old is a bi***, but it sure beats the alternative.:-)

I'm betting if you're that well prepared, you're a machinist, or a precision assembly mechanic. Am I right?

Regards,
PatM
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Old 05-06-2013, 10:06 PM
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Yes, engine stuff by day. Hot rods by night.. Old dogs ya know!!
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Old 05-07-2013, 12:31 AM
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Thnx guys . On my work we have digital from mututoyo . I convert what i measured to inches 3.998425196854712 thats what cameout . How can i measure how much they milled of the deck. Bevouse to know the clearance to te heads . Also is the rust to remove from the cylinderwalls by hone it with a drill tool?
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Old 05-07-2013, 12:42 AM
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There are ways, by measuring components and remaining deck height. But if you aren't knowledgable about these methods at this time, I suggest you take it to a competent machine shop.

PatM
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Old 05-07-2013, 12:45 AM
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Bob

I've been a manufacturing engineer in a defense company for decades (recently retired, now contracting part time) and my respect for machinists and precision assy mechanics is higher than for most of the designers that I've worked with over these many years. You have it.

PatM
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Old 05-07-2013, 01:06 AM
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But looks like the bore is stok right ? Also i cant find numbers on the pistons..
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