350 SBC Crankshaft Advice

[Bob Mulry]

Hi all,

I went looking through the tech specs to see if NHRA added any aftermarket replacement crankshafts for Pontiacs, which they did not.

So I went over to the tech specs for a SBC crankshaft and I found this crankshaft which is a Callies SAF113-CM listed as an NHRA legal replacement crankshaft for a 350 / 305 SBC in STOCK Eliminator.

Turned down flange, lightening holes in all rod journals, pendulum type counterweights and bull nosed…….

I don't understand the NHRA logic.

Take a look and see what you think????????????

[ss3011]

No matter what the crank looks like , the one thing that remains the same is the bobweight . If the rod throws are drilled then extra weight has to be added to the counter weights . You might be able to get a similar crank approved for a Pontiac , which I hope you do !

[GTX JOHN]

The counterweight configuration has a very significant reduction
in windage = real horsepower gain.

I built a plexiglass side on a Mopar pan once to observe the windage.

I would kill to have a crank like that especially in my high RPM small
block combos.

That Crank is a JOKE.........I hope!

[ss3011]

I agree that an improvement in windage helps HP . The crank is definitely part of that equation , baffling is part of that too . However that crank was approved , just needs to apply to all makes . Someone just took the initiative to send a crank in , and ask for approval .

[Bob Mulry]

Originally Posted by GTX JOHN

The counterweight configuration has a very significant reduction
in windage = real horsepower gain.

I built a plexiglass side on a Mopar pan once to observe the windage.

I would kill to have a crank like that especially in my high RPM small
block combos.

That Crank is a JOKE.........I hope!

Hi John,

Nope...
Go the approved crank list and then the manufactures web site and take a look..

[Bob Mulry]

Originally Posted by ss3011

No matter what the crank looks like , the one thing that remains the same is the bobweight . If the rod throws are drilled then extra weight has to be added to the counter weights . You might be able to get a similar crank approved for a Pontiac , which I hope you do !

You have that backwards...Take additional weight off off the counterweight to make up for the lightened journal..

[Race Clean]

Originally Posted by ss3011

If the rod throws are drilled then extra weight has to be added to the counter weights .

I evidently need more education about this!

[ss3011]

Originally Posted by Race Clean

I evidently need more education about this!

Yup , Thought backwards on that one !

[Signman]

Few years ago was trying to get a small block chevy 2 piece seal forged crank approved so I didn't have to waste money on factory and cast cranks any more. (Started with 010 block then moved to bowtie when it was the only performance block allowed later the chevy steel crank started flexing. so I was committed.)

Called Callies and spoke to someone familiar with S/SS who told me the company had no interest in making cranks that could be approved it would mean a new line and inventory with very limited sales. Was warned that is how they would react by my buddy who bought many cranks from them over the years.

Years later the Callies crank on the list showed up can only assume an engine builder with good relations had the crank made and approved. Never personally checked to see if there actually was any inventory because was working with Scat who had a 1 piece seal crank approved on the list.

After 2 years of trying to get Scat to do the process, another case of "is the effort worth the potential business" called and purchased a crank to ship to NHRA, went through the process which was pretty simple it's on the list.

If someone wanted to go through the process of getting a Pontiac crank approved spending all the time and money you probably will be successful.

[rod butcher]

Originally Posted by Signman

Few years ago was trying to get a small block chevy 2 piece seal forged crank approved so I didn't have to waste money on factory and cast cranks any more. (Started with 010 block then moved to bowtie when it was the only performance block allowed later the chevy steel crank started flexing. so I was committed.)

Called Callies and spoke to someone familiar with S/SS who told me the company had no interest in making cranks that could be approved it would mean a new line and inventory with very limited sales. Was warned that is how they would react by my buddy who bought many cranks from them over the years.

Years later the Callies crank on the list showed up can only assume an engine builder with good relations had the crank made and approved. Never personally checked to see if there actually was any inventory because was working with Scat who had a 1 piece seal crank approved on the list.

After 2 years of trying to get Scat to do the process, another case of "is the effort worth the potential business" called and purchased a crank to ship to NHRA, went through the process which was pretty simple it's on the list.

If someone wanted to go through the process of getting a Pontiac crank approved spending all the time and money you probably will be successful.

Frank,
I went thru this process to get the Callies crank approved. Dwayne Boes from Callies brought several cranks to Bruce Batchelder in 2015 and the 305/350 was approved.

Rod