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Hi, I need help and hope there is somebody who really knows 400 engines. I am getting ready to sell my 70 GTO and no matter how much I research it, I can't figure out if the motor was actually built with the car or not. Here is what I have been able to find out: The Casting # is 7970071. The date, by the distributor is 09 with the last # an oversized O. The front date code (wich is the most confusing) 0273569 WT or WZ. I can't see the bottom of the Z (almost like a 7) The manifold dates K198 and K199 with a large 6 and 2 cast into it. With the car being for sale, I'd like to know what to tell perspective buyers about the motor. If anybody knows what I'm looking at, I'd appreciate it.
 

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Year Engine HP Engine code Trans CR Cam Head Code BBL Carb No. Misc
1970 400 350 HP WT M 10.25 067 12 1-4 7040263 Block Casting 9799914

No 1970 WZ blocks were made

Year Engine HP Engine code Trans CR Cam Head Code BBL Carb No. Misc
1967 400 325 HP WZ M 10.75 067 670 1-4 7027273 Block Casting # 9786133
1968 400 335 HP WZ M 10.75 067 (2)16 1-4 7028265 Block Casting # 9790071
1969 400 330 HP WZ M 10.75 067 62 1-4 7029263 Block Casting # 9790071

Number 62 heads are 1969
Year Engine Hp Code Valve Misc
1969 400 330,335,350,366HP 62,48(MT) 2.11/1.77 72cc
1969 400 340HP(GP) 62 2.11/1.77 72 cc

My guess from what you provided is that you have
1969 400 330 HP WZ M 10.75 067 62 1-4 7029263 Block Casting # 9790071

Hope that helps.
 

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Discussion Starter #3
Thanks for the great info, it does help.I was told by previous owner that had the car many years(from mid 70's) that was the original engine. I was hoping to verifiy that.
I'm not sure if there is a way to do that. The numbers you gave do match carb,trans.
I never used PHS so I'm not sure how far they can get into it. Thanks again for the help.
 

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There is a way to verify.

There's a second set of digits stamped into the front of the engine, down low on the passenger side, next to the timing cover (a few inches -below- where you found the WT stamp). They're stamped "veritcal" (they run up and down instead of side to side). These digits will match the serial number portion of your VIN if it's the original block.

(see the attached photo)

Bear
 

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