Brott,
Where was the casting number 3886848 found? The block casting number reference that I use do not have that number. However, 3836848 is the cylinder head number for most 1956 and later 235 engines. Look at this
serial number reference for the FO408J decoding. The engine casting number is on the lower forward passenger's side of the block. The casting date code on the block by the starter is also useful. Look at
Tim's great site for more useful information.
Hoyt
