Hello all, I have been trying to identify what my engine came out of and if the engine and heads are matching. They are currently in a 68 bird, which is not obviously what they came in. I have been able to narrow down that the engine came out of a b-body car I believe, but from there I guess my research just isn't cutting it. Here is what I have.400 Block, XH with casting number 9790071 and the date code is kind of fuzzy, but I believe it is a229. The front of the block also has the number 488635 on it, but it am not sure what that number is for. My belief is this is a 69 block produced 22 Jan 1969.The heads are 62 with what I think is a date code of a279. Not sure if they are ra1 or what.Any help you could provide in figuring out what this motor came out of would be much appreciated. Thanks,Jason
XH code for 19681968 400 350 HP XH A 10.5 066 16 1-4 7028262 GP Block Casting # 9790071this is the XH code for model year 19691969 400 350 HP XH A 10.5 066 62 1-4 7029268 GP Block Casting # 9790071i have never seen heads dated after a block but i have not seen a ton of pontiac heads with the orig blocks.