Part numbers for 1970 LT1 cam

[David B.]

Re: Part numbers for 1970 LT1 cam

Just went to Rock Auto and AT840R doesn't seem to be listed any longer.

Looks like Scoggin-Dickey has them. I'm seeing a $4.00 price, but I'd swear it was $3.60 yesterday.

https://sdparts.com/details/sealed-power/840r

[David K.]

Re: Part numbers for 1970 LT1 cam

Just went to Rock Auto and AT840R doesn't seem to be listed any longer.

I went there late yesterday afternoon and did a search for the AT840R number and also came up empty. The LT1 cam and lifter kit is part # KC1145R, but the lifters in the kit are The AT992. I clicked on the Scoggin-Dickey link provided and the 840 lifters do show up albeit at twice the price they were reportedly selling for at Rockauto. I am replacing the 30-30 cam in my 365 car with the LT1 and I guess I will order the 840 lifters from Scoggin.

Dave

[Mike E.]

Re: Part numbers for 1970 LT1 cam

Looks like Scoggin-Dickey has them. I'm seeing a $4.00 price, but I'd swear it was $3.60 yesterday.

https://sdparts.com/details/sealed-power/840r

They were on Friday I almost ordered them from there... Then I came across the Rock Auto deal. I have a tracking number for the cam and lifters from Rock....Joe wasn't kidding when he said they were in short supply.

Mike

[David B.]

Re: Part numbers for 1970 LT1 cam

They were on Friday I almost ordered them from there... Then I came across the Rock Auto deal. I have a tracking number for the cam and lifters from Rock....Joe wasn't kidding when he said they were in short supply.

Mike

Hope you get 'em! I just got this note from S-D:

Just wanted to give you a heads up that the lifters you have requested are discontinued and the order will be canceled..

Chris Negen
Performance Parts Assistant Manager
1-800-456-0211 ext 353

[Joe C.]

Re: Part numbers for 1970 LT1 cam

Hi Joe,
I bought a 63 driver and this engine will be going in it for a while I search for a correct block so I thought I'd try the LT-1 cam configuration.
The car was a 340 HP but the engine is long gone.
John

So, why try the LT1 cam if you were happy with the Super Dooper 300 HP cam? A lot of unnecessary expense unless the Souper Dopeler left you flat.
If you want to wake up your engine, there are lots of more efficient cams than the olde fashioned LT1.
The Stupor Doppler uses old, tired lobe technology, that has been mixed and unmatched. The LT1 uses the same, old, tired technology, and although properly engineered, is nonetheless still old.

[Gene M.]

Re: Part numbers for 1970 LT1 cam

So, why try the LT1 cam if you were happy with the Super Dooper 300 HP cam? A lot of unnecessary expense unless the Souper Dopeler left you flat.
If you want to wake up your engine, there are lots of more efficient cams than the olde fashioned LT1.
The Stupor Doppler uses old, tired lobe technology, that has been mixed and unmatched. The LT1 uses the same, old, tired technology, and although properly engineered, is nonetheless still old.

Why would anybody call a 300 hp cam super dooper? The 300 hp cam is the same as a 250 hp cam, just a run of the mill GM passenger car profile. Nothing special, old technology. After market has a lot better profiles to select from. The #2102 Edelbrock Cam is much better choice, more mid range power, better gas mileage, velvet smooth.

[John M.]

Re: Part numbers for 1970 LT1 cam

Well, I'm not smart enough to argue with your recommendations guys, but I wanted to try the LT-1. As they say it's your car, do whatever you want. It's temporary anyway.
Joe, I'll be talking to you later.
John

[Joe C.]

Re: Part numbers for 1970 LT1 cam

Why would anybody call a 300 hp cam super dooper? The 300 hp cam is the same as a 250 hp cam, just a run of the mill GM passenger car profile. Nothing special, old technology. After market has a lot better profiles to select from. The #2102 Edelbrock Cam is much better choice, more mid range power, better gas mileage, velvet smooth.

Gene,

The "Stupor Duper 300 HP Cam" is a mix-and-match of different GM vintage hydraulic lobe profiles installed on a modified lobe separation angle. At least one of the two lobes is from the 929 (300 HP cam), but it is NOT a 300 HP cam. It was nicknamed "The Special 300 HP Cam" by one of the "experts" here. It was installed in only a few victim's.............er...........VOLUNTEERS' engines. John is the first of those that I have heard who is now replacing it.

[Joe C.]

Re: Part numbers for 1970 LT1 cam

Well, I'm not smart enough to argue with your recommendations guys, but I wanted to try the LT-1. As they say it's your car, do whatever you want. It's temporary anyway.
Joe, I'll be talking to you later.
John

John,

You are plenty smart.
You just have to be more astute in choosing your advisers.

[Gene M.]

Re: Part numbers for 1970 LT1 cam

Gene,

The "Stupor Duper 300 HP Cam" is a mix-and-match of different GM vintage hydraulic lobe profiles installed on a modified lobe separation angle. At least one of the two lobes is from the 929 (300 HP cam), but it is NOT a 300 HP cam. It was nicknamed "The Special 300 HP Cam" by one of the "experts" here. It was installed in only a few victim's.............er...........VOLUNTEERS' engines. John is the first of those that I have heard who is now replacing it.

Hi Joe,
That does not sound like a GM creation nor something available off the shelf from one of the cam grinders. After all why would a grinder use technology from ancient times. There were back in the day "cheater cams" that met over all duration and max lift but that was about it. They were only good for the drag strip. Maybe it's one of those.

[Joe C.]

Re: Part numbers for 1970 LT1 cam

Hi Joe,
That does not sound like a GM creation nor something available off the shelf from one of the cam grinders. After all why would a grinder use technology from ancient times. There were back in the day "cheater cams" that met over all duration and max lift but that was about it. They were only good for the drag strip. Maybe it's one of those.

The cam was concocted by someone on this Forum, and specially ground by Crane Cams (I believe, but please correct me if I'm wrong).

As far as I know, "cheater" cams use stock lobe lift as well as stock duration. The POML is extended to keep the valves full-open longer, which is supposedly hard to detect during a tech inspection.

[Gene M.]

Re: Part numbers for 1970 LT1 cam

The cam was concocted by someone on this Forum, and specially ground by Crane Cams (I believe, but please correct me if I'm wrong).

As far as I know, "cheater" cams use stock lobe lift as well as stock duration. The POML is extended to keep the valves full-open longer, which is supposedly hard to detect during a tech inspection.

That is exactly what the "cheater" cams were. More area under the curve. Back long, long time ago while in high school my buddy's brother dragged a P stock 265 57 chevy wagon with a "cheater" cam. That was fast, 5.14 gears 3 speed it would pull the wheels. He won just as much as he lost.....!

That other 300 horse thing sounds like an idea than went south. Nobody changes a camshaft that works good.

[Mike E.]

Re: Part numbers for 1970 LT1 cam

I received the cam and lifters today from Rock Auto. The cam box looked pretty old but for $69 for the cam + 33 for lifters didn't seem like a bad deal.








Mike

[Duke W.]

Re: Part numbers for 1970 LT1 cam

That box does look like it's been sitting in a warehouse for years, but you scored a hell of a deal. Back when guys started buying Duntov cams OTC in the fifties I think they listed for about 25 bucks without the lifters. Today that would be a least a hundred bucks, so a cam and lifters for about that amount is a steal.

The black finish in from the Parkerizing process, which is what GM did back in the day to aid break-in and is a big reason why I prefer Federal Mogul cams. The final step is to polish the cam journals, which removes the Parkerizing from them. I believe the Parkerizing creates a surface with micro porosity that holds oil. After some run time the Parkerizing disappears from the lobe, but remains on the the rest of the casting.

Let us know what information is cast or stamped into the cam. It will probably say CWC, which stands for the CWC division of Textron, which makes the blank. There may be other info such as a date code, but I'm not sure how to read them.

BTW, there is only one CWC blank that is used to grind ALL small block flat tappet cams - either mechanical or hydraulic lifter. Back in the day each GM cam had a unique blank with lobes close to finished dimension so minimum grinding was required. That's the best way when you are grinding up to a million cams a year.

Given the relatively low demand, today, it's cheaper to tool up for just one blank, and from this one blank comes hundreds of different finished camshaft designs.

Duke

[John M.]

Re: Part numbers for 1970 LT1 cam

And I thought I got a deal at $119 and $2.11 each!