409 build

[64ImpSS]

Summit Racing lists 2 cranks for 409 motors with a 4" stroke. Is that feasible? Is there enough clearance for that. I have a truck motor and want to build a street / strip motor.

 

[IMBVSUR?]

Cast, Forged, Yes.

 

[63 dream'n]

Summit Racing lists 2 cranks for 409 motors with a 4" stroke. Is that feasible? Is there enough clearance for that. I have a truck motor and want to build a street / strip motor.

I believe that’s because there’s two different brands eagle and scat
I believe if you use the scat crankshaft along with a specific scat rod that there is no block work is needed......But obviously you would want to mock things up to know that........4 inch stroke with 6.385 big block rods......Show cars would have the Pistons I believe they would be Ross...... but you could always go different after market........ for more performance

 

[Ishiftem]

Yes there is room. At worst a few small notches may have to be made to clear the rod bolts depending on what rod is used. Get the Scat. The eagle machining sucks.

 

[Don Jacks]

For street/strip with the later in mind[6500 plus] use the Scat crank and Scats best I bean rod.That with a light piston will let you go to 7,000 safely.

 

[409gang]

Yes, not only can you put a 4" stroke in a 409 but you can also put it in a 348!! My Nova engine is a truck 409 and has a 4" crank and the bore is 4.35 (.038 over) which equals 475 cubic inch. I am also in the process of building a 348 with a 4" stroke and 4.155 bore (.030 over), it will be 434 cubic inch. Remember this is still America and bigger is better!

 

[Iowa 409 Guy]

Yes, not only can you put a 4" stroke in a 409 but you can also put it in a 348!! My Nova engine is a truck 409 and has a 4" crank and the bore is 4.35 (.038 over) which equals 475 cubic inch. I am also in the process of building a 348 with a 4" stroke and 4.155 bore (.030 over), it will be 434 cubic inch. Remember this is still America and bigger is better!

That's what she said Steve.

Why not a Callies Dragon Slayer with the 4.25"????...America...bigger is better...

 

[409gang]

That's what she said Steve.

Why not a Callies Dragon Slayer with the 4.25"????...America...bigger is better...

A 4.25" stroke would give you 500+ cubic inch!

 

[63 dream'n]

Summit Racing lists 2 cranks for 409 motors with a 4" stroke. Is that feasible? Is there enough clearance for that. I have a truck motor and want to build a street / strip motor.

Yes there is room. At worst a few small notches may have to be made to clear the rod bolts depending on what rod is used. Get the Scat. The eagle machining sucks.

 

[409gang]

View attachment 89307

Those notches look familiar!!

 

[dm62409]

That's what she said Steve.

Why not a Callies Dragon Slayer with the 4.25"????...America...bigger is better...

A 4.25" stroke would give you 500+ cubic inch!

I think a 4.25 stroke in the 409 block would have clearance problems with the camshaft. The 409's camshaft to crankshaft centerline is closer than a BBC.

 

[Don Jacks]

Jack Gibbs is one of the few whose succesfully made the 4.25 stroke crank work and live

 

[Iowa 409 Guy]

I think a 4.25 stroke in the 409 block would have clearance problems with the camshaft. The 409's camshaft to crankshaft centerline is closer than a BBC.

Rod clearance ?

 

[Ishiftem]

The owner of the machine shop I use has 409 with a 4.25 stroke. He used Honda rod journals 1.88.

 

[BSL409]

View attachment 89307

that would be 068 truck block

 

[BSL409]

Carl, has done some 4.25 stroke 409'S

 

[63 dream'n]

that would be 068 truck block

That would be your 068 block ..........

 

[wristpin]

Nice to know about Eagle machining. Been looking at Eagle and Scat crank and rods. Scat it is

 

[Jim Sullivan]

When I talked to Carl McQuillen earlier this year(I think), he said there are currently no issues with either Eagle or Scat cranks.