From just under the #1 cylinder 381130833 has #5 heads and a holley street dominator intake. its a 350. Any info would be nice. Thanks Orrick

 

68-72 350s had a casting number of 3955582 so not sure what year ours is from

 

That number is the VIN derivative of the car the engine came from.

3 = GM division = Oldsmobile

8 = model year = 1968

1 = assembly plant = Oshawa Canada

130833 = plant sequential number

The casting number (and letter) for the engine block is located on the front of the engine block, visible from the top, between the intacke manifold and the timing cover.

Randy C.

 

Thanks Randy

 

Ok so ive been looking at all these threads and cant seem to know what engine i have three codes all point to a 350 but ive never seen anybody ask about all three only one...
1.Driver side#39M421187
2.oil tube#9654555
3.right behind timing plate 395558 big 2

And i have the number 5 heads
Gold block

 

A 1969 model year 350 cubic inch engine.


Randy C.

 

So indeed a 69....is this a good block and does anybody know the hp rating on these blocks and should i switch the 5 heads for sum better..

Jus want do a couple burnout

 

Hi Kyron,
1) same as what Randy posted above, 3(olds)9(1969)M(Lansing) 421187 is the VIN derivative and should match the last 6 numerals of your cars VIN tag.
2) 9 (1969) 654555 is the engine plant sequence number...means something to the engine plant but no one else

3) confirms its a 350 block.

Brett