Hey Guys, I have a 68 400 (YT block) confirmed by PHS - but I am trying to determine what heads I have. I have identified two separate codes stamped on my heads;
1. EO 18 (stamped on driver side heads ) and 2. D2 68 (stamped on passenger side heads).
I assume that the EO 18 is the head casting ID but this indicates that I have 350 HO heads - which is not on my PHS could mean that someone swapped heads? Assume the D2 68 is a production date code of some sort. Any guidance on this?
On the left side you will see something like 01D, 05E, 04C...Not particularly improtant, but that is your body broadcast date. Your heads for a late year 68 are 3 weeks apart. rare for a late year Firebird to have such a spread in date castings, but never say never. You typically find a wider range of date codes (2-10 weeks) for heads, block, rear, trans, water pump, regulator carb on early high production models. Somewhat narrower for 400 (2 to 6 weeks) and even narrower for HO and Ram Air (2-4 weeks) sans manifolds.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
