Finally I Got a What Did You Get Done Thread - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mrein3 · 06-15-2004, 07:59 AM

After watching everybody make posts showing off all the fine work they have done on their trucks I finally got off my butt and did something. This is a bare 350 block I pulled out of a 1971 Monte Carlo that the Minnesota road salt got the better of. It is currently at the machine shop. My plan is to make a 383 out of it for my truck.

According to the mortec site the "010" and "020" mean:
"Some of the smallblock motors used blocks with an additional 1% tin and an additional 2% nickel added to the cast iron alloy. These very desirable blocks can be identified by looking at the block face under the timing chain cover for "010" and "020". These designators can also sometimes be found on the rear face of the block inside the perimeter of the bellhousing mating surface. "

I hope the pictures attach. This is my first attempt with the "new" board.

MrGoodpliers · 06-15-2004, 08:26 AM

Good lookin' block... Minor core shift, but it should make a fine street motor for you. Good luck, keep the pics coming.

FRENCHBLUE72 · 06-15-2004, 09:15 AM

Congrat's on the progress..

Alex Hayley · 06-15-2004, 09:29 AM

MrGoodpliers...what is core shift?

krue · 06-15-2004, 10:46 AM

Quote:

Originally Posted by Alex Hayley

MrGoodpliers...what is core shift?

I was wondering the same thing.

LONGHAIR · 06-15-2004, 11:14 AM

When the block is cast, the molten metal is poured into a mold. Inside the mold are inserts that take up some of the space in the mold. This is so you get the openings inside the block, like the water jackets. There are plugs where the cylinder bores are too. (This cuts down on machining) These "cores" are made of sand and when the block has cooled and solidified the inner cores are broken and removed. That's why they are sand, it shatters into dust and flows out easily.
This internal cavity for water flow is why no one make "billet" blocks for automotive engines like they do for Harleys. Harley engines are air cooled and have only a few oil passages that are drilled in them.

So, "core shift" is when the internal core pieces move out of perfect alignment before or as the motlen iron/aluminum is poured in.

Davy · 06-15-2004, 12:14 PM

This is interesting.
Can you circle the spot in the pic that shows the shift?

Thanks,
Davy

MrGoodpliers · 06-15-2004, 01:06 PM

Look at the boss for the cam, and you will see that the hole is not exactly centered in the boss. This one is minor, if you are looking for a block to go all out with, stay away from one with a boss/bore that looks like a deviled egg!

mrein3 · 06-15-2004, 01:26 PM

Quote:

Originally Posted by MrGoodpliers

Look at the boss for the cam, and you will see that the hole is not exactly centered in the boss. This one is minor, if you are looking for a block to go all out with, stay away from one with a boss/bore that looks like a deviled egg!

I don't see that. Could it be that it just appears the hole is off center because the picture was taken at an angle? Except for a timing chain the engine operated flawlessly for 175,000 miles.

Jefe · 06-15-2004, 03:42 PM

I have never heard that and I don't think it matters that much.

Douglas.

06-15-2004, 07:59 AM	#1
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,254	Finally I Got a What Did You Get Done Thread After watching everybody make posts showing off all the fine work they have done on their trucks I finally got off my butt and did something. This is a bare 350 block I pulled out of a 1971 Monte Carlo that the Minnesota road salt got the better of. It is currently at the machine shop. My plan is to make a 383 out of it for my truck. According to the mortec site the "010" and "020" mean: "Some of the smallblock motors used blocks with an additional 1% tin and an additional 2% nickel added to the cast iron alloy. These very desirable blocks can be identified by looking at the block face under the timing chain cover for "010" and "020". These designators can also sometimes be found on the rear face of the block inside the perimeter of the bellhousing mating surface. " I hope the pictures attach. This is my first attempt with the "new" board. Attached Images __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN

06-15-2004, 08:26 AM	#2
MrGoodpliers Registered User Join Date: May 2002 Location: Gainesville, Georgia Posts: 704	Good lookin' block... Minor core shift, but it should make a fine street motor for you. Good luck, keep the pics coming. __________________ We made Oklahoma a little after 3, Randy & his brother Bob & my old GMC...

06-15-2004, 12:14 PM	#7
Davy Registered User Join Date: Apr 2003 Location: Rice, Minnesota Posts: 370	This is interesting. Can you circle the spot in the pic that shows the shift? Thanks, Davy __________________ 1970 Blazer CST Looking for NOS items for my CST restoration.

06-15-2004, 01:06 PM	#8
MrGoodpliers Registered User Join Date: May 2002 Location: Gainesville, Georgia Posts: 704	Look at the boss for the cam, and you will see that the hole is not exactly centered in the boss. This one is minor, if you are looking for a block to go all out with, stay away from one with a boss/bore that looks like a deviled egg! __________________ We made Oklahoma a little after 3, Randy & his brother Bob & my old GMC...

06-15-2004, 03:42 PM	#10
Jefe Registered User Join Date: Jul 2000 Location: Chandler, Arizona, USA Posts: 299	I have never heard that and I don't think it matters that much. Douglas. __________________ -1968 Chevy SWB = Frame Off/383/Muncie Car 4 speed -1968 Chevy SWB = numbers matching 307/Truck 4 speed. -1966 Chevy II = 2 door No Post/130,000 Orig miles/230 6cyl/powerglide/Vintage AC -1972 Chevy Nova = 2 door/412 Small Block -1927 Ford Roadster = Homebuilt/widened 8"/350/ Custom Everything.

06-15-2004, 09:15 AM	#3
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,606	Congrat's on the progress..

06-15-2004, 09:29 AM	#4
Alex Hayley Registered User Join Date: Jul 2000 Location: NC Posts: 987	MrGoodpliers...what is core shift?

06-15-2004, 11:14 AM	#6
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	When the block is cast, the molten metal is poured into a mold. Inside the mold are inserts that take up some of the space in the mold. This is so you get the openings inside the block, like the water jackets. There are plugs where the cylinder bores are too. (This cuts down on machining) These "cores" are made of sand and when the block has cooled and solidified the inner cores are broken and removed. That's why they are sand, it shatters into dust and flows out easily. This internal cavity for water flow is why no one make "billet" blocks for automotive engines like they do for Harleys. Harley engines are air cooled and have only a few oil passages that are drilled in them. So, "core shift" is when the internal core pieces move out of perfect alignment before or as the motlen iron/aluminum is poured in.



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