[PAUL K]

Would anyone have a Super Duty 455 crankshaft that they would be able to share a couple of photos of? I am particularly interested in the front and rear counter weights that are opposite (or 180 degrees from) the connecting rod pin.

[74SDformula]

Here are a few photos for you. Hope they help.

[formula kid]

I have a NOS in the box will try to get pictures uploaded part #495030 which I have had for years,

[PAUL K]

Thank you guys!
74SDformula are those pictures current? Would it be possible to rotate the engine a bit and take a picture of the rear counterwight? I would like to see the holes drilled for balancing. You can see the holes in the front counterweight perfectly in your third picture. That's what I have interest in seeing. It does not look like your crank has been balanced(other than by the factory).....has the engine ever been rebuilt?

[PAUL K]

furmula kid, that would be great if you could share some pictures of the crank. The 495030 cranks I've seen did not have a casting number, just a number painted on the front counterweight face.

[74SDformula]

Originally Posted by PAUL K

Thank you guys!
74SDformula are those pictures current? Would it be possible to rotate the engine a bit and take a picture of the rear counterwight? I would like to see the holes drilled for balancing. You can see the holes in the front counterweight perfectly in your third picture. That's what I have interest in seeing. It does not look like your crank has been balanced(other than by the factory).....has the engine ever been rebuilt?

Sorry, but these are the only photos I have of the bottom end of this engine. This engine has never been rebuilt.

[PAUL K]

Originally Posted by 74SDformula

Sorry, but these are the only photos I have of the bottom end of this engine. This engine has never been rebuilt.

Thank you for taking the time to post them.

[Tom63LeMans]

Searching out crankshaft #495030 I found this old post and was hoping to validate a crank that I have. I recently bought some engine parts from a guy that said this crank was purchased new over the counter long ago but he never installed in his engine. I do not see any cast part number other than what is shown. The paint stamped numbers are visible on front counterweight. It has never been used and journal diameters are .001 under standard which I’ve read is the way they were machined. Any other details that would be specific to this part number?
Thanks

[74SDformula]

Is there a casting number on the crankshaft and if so what is it?

[Rocky Rotella]

The 495030 crankshaft absolutely is the production SD-455 unit.

It was constructed from the standard nodular-iron 9799103 455-inch unit, but its main and rod journals should be .001-inch undersized and balancing is specific for the forged rods and pistons. It could/should have the typical 9799103 part number cast into a counterweight, but it was identified by the "495030" paint stamping. One that wears off after years of use or cleaning, there's no other way to separate it from a typical 103 crank. And a competent crank grinder can replicate it pretty easily.

[Tom63LeMans]

Originally Posted by 74SDformula

Is there a casting number on the crankshaft and if so what is it?

There is not a casting number or “N” on this crank. Based on Paul and Rocky’s replies the numbers may or may not be present. The paint numbers on the side of the front counterweight are very clear and another matching stamp on the edge of the counterweight is partially visible. The journals measure .001 under standard and the rolled fillets are visible. It’s also obvious this crank was never installed.

[Rocky Rotella]

Tom, the 495030 would not have had the deep rolled fillets. It should have the same fillet radius as the standard 9799103 crankshaft.

I’d be interested in seeing more photos of the crank if you can post them!

[Tom63LeMans]

I’d be interested in seeing more photos of the crank if you can post them![/QUOTE]

Rocky,
Here are some more pictures. Is there any particular area pictures needed?
Thanks, Tom

[Rocky Rotella]

Thanks, Tom!

It's interesting to see that this particular crankshaft was manufactured by CFD (Central Foundry Division), which means it's probably a later SR unit. And the 313 indicates that it was produced on the 313th day of the year. What year, we may never know. I'd guess mid 1970s though.

I'd like to keep these pictures in my files. The ones that PY stores are smaller files. Any chance you could email me the larger files at jamesrotella@cox.net?

[starlightblack]

Originally Posted by Rocky Rotella

Thanks, Tom!

It's interesting to see that this particular crankshaft was manufactured by CFD (Central Foundry Division), which means it's probably a later SR unit. And the 313 indicates that it was produced on the 313th day of the year. What year, we may never know. I'd guess mid 1970s though.

But it is a SR Super Duty crank?

[Tom63LeMans]

Originally Posted by starlightblack

But it is a SR Super Duty crank?

According to the guy I got it from he purchased the crank over the counter to rebuild his ‘72 HO motor. He doesn’t remember what year. The Hendrickson & Osterstock HD parts book lists this part # being correct for 73-74 SDs.

[PAUL K]

The last SD455 crankshafts available from Pontiac had the PN painted on the front counterweight. They did not have a casting number. I remember trying to buy one from Pontiac around 1982 and they were discontinued. We purchased an NOS unit from Nunzi and he told us he bought the last few Pontiac had.

Nothing special about the SD crankshafts other than machining and balance. I doubt any of them sold to the public had rolled fillet's and probably none of the cars did. From what I've read the "rolled fillet" deal was a complete disaster.

Tom63's crankshaft has a radius corner but not a "rolled fillet". I often wondered if the later SR cranks were cast differently like the later 400/455 cranks and that was the reason for the part number change.

[poncho-mike]

I have a 1974 SD455 4-spd car built in July 1974. It had about 75K miles on it when I got it back around 1985. I rebuilt the numbers matching engine due to a rear main leak. I was told the car had been driven very easily After tearing it down and checking the parts, I found the block had less than .001" wear in the bore and there was no wear on the crank. The rebuild was well documented (in 35mm photos), and I remember seeing the little marks in the fillets of the bearing surface. I asked my machinist what the marks were, and he told me it was a method of work hardening the fillet of the crank. The journals on my crank looked just like the first picture Tom posted.

I remember having some questions about the crank when I tore it down. My crank had 9799103 p/n cast into the crank. I remember seeing some paint marks on the crank, but I don't remember seeing a full p/n. At the time, I was confused because the parts list I had said an SD455 crank should have a different p/n. I discussed the crank with Nunzi or H-O on their tech line and told them about the rolled fillets, and they confirmed it was an original SD crank.

[Rocky Rotella]

Originally Posted by starlightblack

But it is a SR Super Duty crank?

I would say yes, absolutely.

[PAUL K]

Originally Posted by poncho-mike

I have a 1974 SD455 4-spd car built in July 1974. It had about 75K miles on it when I got it back around 1985. I rebuilt the numbers matching engine due to a rear main leak. I was told the car had been driven very easily After tearing it down and checking the parts, I found the block had less than .001" wear in the bore and there was no wear on the crank. The rebuild was well documented (in 35mm photos), and I remember seeing the little marks in the fillets of the bearing surface. I asked my machinist what the marks were, and he told me it was a method of work hardening the fillet of the crank. The journals on my crank looked just like the first picture Tom posted.

I remember having some questions about the crank when I tore it down. My crank had 9799103 p/n cast into the crank. I remember seeing some paint marks on the crank, but I don't remember seeing a full p/n. At the time, I was confused because the parts list I had said an SD455 crank should have a different p/n. I discussed the crank with Nunzi or H-O on their tech line and told them about the rolled fillets, and they confirmed it was an original SD crank.

Any pictures of the "rolled fillets"?