68s350

Hey Guys,

Need a little help.

I'm looking to purchase a 1970 455 from a tornado gt. The codes below.

403 686 on head with an E up toward the front.

The pad on the block under the head says 6OM612455

396021F by waterpump

Guy says its the W34 option 400hp. Anyone?

mrolds88

Ok here is my take.

396021F- standard casting number for 68-70 455
403686- Standard 68-70 455 head. If original, should have big valves
6OM612455- this has me stumped. Working backwards on the numbers

612455- sequence number-part of the original car serial number
M- Lansing built
0- 1970
6- this is where the confusion is. Olds division is 3. I would double check.

68s350

Hey mr olds,


So there is nothing special here that says it is the n400 HP version that they put in the toronado gt? I have vin from car that the motor came out of and pics of the car and cutout bumper from the gt. see attachments.


Vin#394870M612455

http://automotivemileposts.com/toron...ado1970gt.html

mrolds88

Looks like you have the original engine. They were actually rated at 2 horsepowers IIRC, 390hp and 400hp. 400 had ram air under the bumper similar to the 68 A body setup. Why is he just selling the engine? Car itself is rather rare.

joe_padavano

Look again. That number will actually be 30M612455. 3 = Oldsmobile division, 0 = 1970 model year, M = Lansing assembly plant, and 612455 = the last six digits of the car's VIN. As you've seen, this IS the orginal numbers-matching engine for the car it came out of. If that car was a W-34, this is that engine.

There's no way to tell that from the outside of the engine. You'll need to tear it down and measure a cam lobe to verify. Again, if the car it came from is a W-34, this is the numbers-matching engine (or, at least the original block).

wmachine

No, the 400 hp was the W34 engine. They made 5341 W34s in 1970. They did *not* have a ram air intake, read this:
https://classicoldsmobile.com/forums...0-toro-gt.html

There is a round about way of telling without disassembly if the original trans and engine are together. Like the W30s and W31s, it has a unique trans. If it has an OM trans and the engine and trans have matching VINs, the engine is indeed a W34.

68s350

The # is indeed a 3. I'll see if I can get the guy to look at the tranny cosde. Will keep you posted and thank you for your input.

mrolds88

Ok it was my mistake. They had ram air in 68 only. I knew somewhere they had it, just got the wrong year. LOL