decoding an 870 block
Thread Starter
Burning Brakes
Joined: Mar 1999
Posts: 927
Likes: 62
From: Lake Elmo, MN, USA MN
decoding an 870 block
I am interested in purchasing a 327 with the last 3 digits of the block # being '870'.
On one block the numbers on the left side are # xxxxx870 72 and on the right side G18
On the other block, the numbers on the left side are # xxxxx870 721 and on the right side is G18.
Can anyone help me with the decoding these numbers?
Thanks
On one block the numbers on the left side are # xxxxx870 72 and on the right side G18
On the other block, the numbers on the left side are # xxxxx870 721 and on the right side is G18.
Can anyone help me with the decoding these numbers?
Thanks
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
Assuming you're talking about the rear flange of the block (where the bellhousing bolts up), it should have 3782870 raised on the left side, and the G 1 8 on the right side is the raised casting date, inbetween two screw head impressions. Take another look at the casting date, as 870 blocks were only cast from '62-'65, and G 1 8 is July 1, 1968.
What's stamped on the machined pad at the front of the deck on the passenger side?
What's stamped on the machined pad at the front of the deck on the passenger side?
Racer
Joined: Apr 2008
Posts: 439
Likes: 2
From: PASADENA CALIFORNIA
Assuming you're talking about the rear flange of the block (where the bellhousing bolts up), it should have 3782870 raised on the left side, and the G 1 8 on the right side is the raised casting date, inbetween two screw head impressions. Take another look at the casting date, as 870 blocks were only cast from '62-'65, and G 1 8 is July 1, 1968.
What's stamped on the machined pad at the front of the deck on the passenger side?
What's stamped on the machined pad at the front of the deck on the passenger side?
May be the "8" was mis read and it is really a "3" ? This would make more sense.
Chris CWPASADENA
Racer
Joined: Mar 2008
Posts: 338
Likes: 19
From: Mesa Az
OOPs,
He said he had two blocks and I was assuming (I know, don't assume) that he was referring to the last 3 digits of the casting numbers. 3790721 was a Chevy II casting for 65, the last 3 digits of which are usually found on the front of the block under the timing cover area and the rear under the bell housing area, along with the last 3 digits of other small blockcasting numbers that used the same front and rear patterns. I mistakenly thought that was what he was referring to.
He said he had two blocks and I was assuming (I know, don't assume) that he was referring to the last 3 digits of the casting numbers. 3790721 was a Chevy II casting for 65, the last 3 digits of which are usually found on the front of the block under the timing cover area and the rear under the bell housing area, along with the last 3 digits of other small blockcasting numbers that used the same front and rear patterns. I mistakenly thought that was what he was referring to.
