348 409 Engine Block Casting Numbers Information This page has information for the 348 and 409 Chevrolet engines It also shows the locations of various number and code locations on the block heads
348 409 General Information General information on 348 and 409 engines 348 The 348 engine was first introduced in October of 1957 The 348 was originally scheduled to be used only in Chevrolet trucks More cubic inches were needed in the passenger cars so the 348 was used there as well In the first year, two versions were available; the 4-barrel 250hp and the 280hp equipped with 3-2 barrel carburetor's Late in 58
Parts reference page - 348-409. com 348 409 This page contains various pictures of 348 and 409 engine parts These pics have been assembled here to use as a reference and to help in identifying these parts Part numbers are given when available
Cylinder Head casting numbers - 348-409. com The primary difference between the 348 and 409 cylinder heads is that the 409 head was the only W-block small port head that used 3 8" push rods The 409 valve spings were larger in diameter and stiffer (128-140 lbs at 1 68 installed height)