marshall93z

a 400 and a 350? dont know where to post this so i figured i would try it here. friend says he has a 350 in his s-10 but we think it could possibly be a 400 block so just trying to find some ways to identify it.

marshall93z

someone has to know the answer to this?!!! some say the dipstick is on the driver side on the 400...i have no clue.

Revolutionary

Several clues. On a stock 400 the crank is externally balanced so if you look at it the balancer will look like it has a big cutout on half of it. On the block, most 400 blocks have 3 freeze plugs on the side instead of 2 like a 350. Some versions of the 400 only have two freezeplugs but have a boss cast is the side that looks like there should be a freezeplug machined in there. Another giveaway is the casting number. Most 400 blocks had a casting number ending in 511 or 509 instead of the most common 350 casting of 010 for that year range.

marshall93z

thanks for the info...where would that casting number be?

VKasm1

Check here http://www.mortec.com/location.htm