Stock vs stroker crank w/ speedmaster rods

[egonz]

Hi everyone, I’m in the process of building my first 360 and am debating on making it a 408 stroker. I will be using speed pro h116cp pistons 30 over & speedmaster h beam rods which are supposedly clearanced for a stroker. I have a stock crank ground 10 under (.003 current bearing clearance but align hone is being done & I don’t know if that will make this clearance larger/out of spec). I am considering getting the scat 9000 4” stroke crank. I have the summit 163318
balancer with removable weights. My questions are as follows

1: has anyone run these rods with a stroker crank?
2: if I get the scat crank will I need to get the assembly balanced? Supposedly the pistons and rods are weight matched from the factory (I would use the summit balancer without the additional weights)
3: given the oil clearance doesn’t increase can I run the stock crank with stock balancer & weighted torque converter setup -skip balancing
4: what would you do for a street engine? (Is it worth spending the extra money for a stroker)

 

[pittsburghracer]

Yes that assembly will need balancing. Also any stroker engines need rod to block clearance checked. Many need clearancing especially strikers with Mopar sized rod journals.

 

[Professor Fate]

For starters, those pistons are a no-go for a stroker crank- they're for a standard stroke.
A nearly 1/2 inch additional stroke will put those pistons through the head.

 

[egonz]

For starters, those pistons are a no-go for a stroker crank- they're for a standard stroke.
A nearly 1/2 inch additional stroke will put those pistons through the head.

Ah I didn’t even think of that, thanks for pointing it out!

 

[pittsburghracer]

For starters, those pistons are a no-go for a stroker crank- they're for a standard stroke.
A nearly 1/2 inch additional stroke will put those pistons through the head.

He needs to talk to one of the piston manufacturers and get the right parts. He has a smorgasbord going on there.

 

[Professor Fate]

My advice: you've got the parts, build the 360. It's rarely a good idea to change direction mid-project.
If the 360 doesn't make you happy, then at least it gives you a baseline to plan your next upgrade or engine build.

 

[egonz]

My advice: you've got the parts, build the 360. It's rarely a good idea to change direction mid-project.
If the 360 doesn't make you happy, then at least it gives you a baseline to plan your next upgrade or engine build.

Thanks for the advice, the stroker was just a last minute idea. Going to stay on track for the 360

 

[pittsburghracer]

Thanks for the advice, the stroker was just a last minute idea. Going to stay on track for the 360

Are you doing the assembly? If so I would have a machine shop torque down the rods and do some size checking. That is unless you have experience at doing this.

 

[egonz]

Are you doing the assembly? If so I would have a machine shop torque down the rods and do some size checking. That is unless you have experience at doing this.

I am doing the final assembly but the machine shop is checking clearances & roundness for me

 

[Ottmundr]

Hi everyone, I’m in the process of building my first 360 and am debating on making it a 408 stroker. I will be using speed pro h116cp pistons 30 over & speedmaster h beam rods which are supposedly clearanced for a stroker. I have a stock crank ground 10 under (.003 current bearing clearance but align hone is being done & I don’t know if that will make this clearance larger/out of spec). I am considering getting the scat 9000 4” stroke crank. I have the summit 163318
balancer with removable weights. My questions are as follows

1: has anyone run these rods with a stroker crank?
2: if I get the scat crank will I need to get the assembly balanced? Supposedly the pistons and rods are weight matched from the factory (I would use the summit balancer without the additional weights)
3: given the oil clearance doesn’t increase can I run the stock crank with stock balancer & weighted torque converter setup -skip balancing
4: what would you do for a street engine? (Is it worth spending the extra money for a stroker)

Get this book, read it. Make your decisions based on data, not what you think may sound cool.

 

[j par]

If you ever do a stroker, which is in my opinions, they are a complete Beast on the street. A prebalanced assembly is just 10 times less complicated...