I dropped the 1 & 2 rods out the bottom of my 1967 GTO on the on ramp in Waco Texas at about 45 mph in hard rain, now all gto owners know I sure was not heavy into the throttle when it let go because I was not going sideways in the standing water. Dumb kid stole car 2 weeks before and was outruning State crown vic at 138mph until he found you can't out run motorola and 2nd state car boxed him from the front. I will guess he strained it a little too much. I about crapped when my cell phone rang and SPD asked do you know where your green convertable is?
I look all over for a long block in south texas and could not find one. I winter in tx and summer in Mn so I bought a long block in Minnesota to take down next week and have rebuilt, but I am not really sure what 400 I bought. Here is what I can read on the block: Date code is H247 Aug 24 1967 I think, but the casting no is 481988 my docs say 1971 72 or 1973 400. It has 400 on side of block where it should and has three freeze plugs.
The motor unit number is stamped not cast PWH on left front below head Only WH I find is 1969 345 HP. The cast engine code is XX which looks like a 325 hp 400 in 1967 but the casting number should be 9786133 by my books.
The heads are 6X and manifold is 9779088.
My questions 1. does anyone really know what 400 I will be rebuilding, 2. what valves are in 6X is it 2.11/1.77 or 1.92/1.64, 3. is the 979088 manifold the low restriction cast, 4. what cam/pistons would you use if you don't need 10.5 knock with 91 octane fuel. Its just my fun driver on the curves on the way up to the lake on the fun Wi back roads and has not seen a
1/4 mile in a loooong time.pontiacpower.org has had some good info but until I put a wrench on it I can only make swag's. you can email me at snipped-for-privacy@yahoo.com if you have any good thoughts.