casting numbers ... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dogman · 02-24-2005, 12:17 AM

Trying to see what yr of block and heads do I have .The casting numbers are 3970010 for the block and the heads are 3946813 . Thanks

skokie · 02-24-2005, 12:30 AM

From mortec.com
Block
3970010....302.....69....4...Z-28 Camaro
3970010....327.....69....2...Trucks and industrial
3970010....350...69-80...2 or 4

Heads
3946813....69-79...350..........Truck

Gary · 02-25-2005, 02:35 AM

While there's already a thread on this - where can I look on my truck for casting numbers? I'm curious to find if my motor is an original motor or a drop in, I'm betting it's not original but it'd be nice if it were.

JimKshortstep4x4 · 02-25-2005, 07:28 AM

Decoding the suffix code, (located on the right front of the engine block) should give you the information that you need.

Jim

Gary · 02-25-2005, 01:14 PM

Man I cannot find this code on the front, is it under the water pump maybe?

The engine casting number is 3999290
The intake manifold is 6263753
The exhaut manifolds are RH 353030 ?M? could be 11 LH 3994045N

JimKshortstep4x4 · 02-25-2005, 08:51 PM

There is a pad approximately 3/4" wide by 2" long at the right front of the engine block. It is like an extension of the block deck. If you have AC than it will be hard to see. The pad could also have a lot of paint on it. The pad is at an angle but the stamped surface faces upward so you should be able to see it. If you can't find it repost and I will take a pic of a pad.

Jim

02-24-2005, 12:17 AM	#1
dogman Registered User Join Date: Feb 2002 Location: Dallas,TX Posts: 164	casting numbers ... Trying to see what yr of block and heads do I have .The casting numbers are 3970010 for the block and the heads are 3946813 . Thanks

02-24-2005, 12:30 AM	#2
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,335	From mortec.com Block 3970010....302.....69....4...Z-28 Camaro 3970010....327.....69....2...Trucks and industrial 3970010....350...69-80...2 or 4 Heads 3946813....69-79...350..........Truck __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

02-25-2005, 02:35 AM	#3
Gary Senior Member Join Date: Jan 2004 Location: Harvest, AL Posts: 545	While there's already a thread on this - where can I look on my truck for casting numbers? I'm curious to find if my motor is an original motor or a drop in, I'm betting it's not original but it'd be nice if it were. __________________ Gary Harris 85 Silverado - 87 Grand National 2007 Ardmore Car Show

02-25-2005, 01:14 PM	#5
Gary Senior Member Join Date: Jan 2004 Location: Harvest, AL Posts: 545	Man I cannot find this code on the front, is it under the water pump maybe? The engine casting number is 3999290 The intake manifold is 6263753 The exhaut manifolds are RH 353030 ?M? could be 11 LH 3994045N __________________ Gary Harris 85 Silverado - 87 Grand National 2007 Ardmore Car Show

02-25-2005, 07:28 AM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Decoding the suffix code, (located on the right front of the engine block) should give you the information that you need. Jim

02-25-2005, 08:51 PM	#6
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	There is a pad approximately 3/4" wide by 2" long at the right front of the engine block. It is like an extension of the block deck. If you have AC than it will be hard to see. The pad could also have a lot of paint on it. The pad is at an angle but the stamped surface faces upward so you should be able to see it. If you can't find it repost and I will take a pic of a pad. Jim



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