What is the largest stroke crank for a stock 440 block

[pandamarie]

 Just got back from SEMA and was looking at SCAT and EAGLE  cranks for a new engine build, They both had 4.5" stroke cranks that they say will fit in a stock 440 block. Anyone with any expereance that would know what the largest size crank I could install with the minimum amount of work? Running ARP studs on the bottom end with a bottom end girdle to help stiffen it up. Along with Eagles H beam 7.1 rods and 11.6 compression pistons with CNC Stealth heads.
Looking at Crane for a Hyd roller cam, Any ideas on lift and duration? Car is a 69 Daytona clone want it for street and strip weight will be 4200 with me in it. induction is a accel DFI7 with 1200 cmf throttle body and 46lb injectors on a modified edelbrock torquer intake. TTI 2" primary with 3" exhaust. Have 3.23, 3.55 and 3.91 gears and will be running a gear vendors OD.

[Chryco Psycho]

well the Hemi with the same bottom end has run 4.5" stroke cranks no problem , but you will probably have to run external oil pick up to clear the crank, you will also have to notch the bottom of the bores for rod clearance  . I keep going back to the 512 combo , it is an easy fit & will make as much power as any hyd cam combo can make

[Challenger340]

"Fitting", the Big Arms in the stock Blocks is NOT the problem........at least not as long as you are NOT making any power either ?

It's when you start making POWER with those Big arms in the stock Blocks with "REAL" Heads.... for any length of time....that things start get "interesting" ?

No matter,
the Stealth Heads, even the CNC, are pretty limited power-wise on anything above 500", so you would probably be fine without busting the Mains.

You can NOT exceed the power the Heads are capable of, NO MATTER how big you make the Engine underneath the Heads....

just for example, assuming same Heads and Cam around 240*-250* @ .050 duration....
* You can have a 451 cubic inch that makes 550-600hp at 56-5700 rpm
* You can have a 500 cubic inch that makes 550-600hp at 53-5400 rpm
* You can have a 540 cubic inch that makes 550-600hp at 49-5000 rpm

Yes, you CAN get alot of Torque, and you can cheat it somewhat hp-wise, but not much from the example above.....and no FUN having to shift like it's a TRUCK motor ?
if U know what I mean here....

[Cooter]

"Fitting", the Big Arms in the stock Blocks is NOT the problem........at least not as long as you are NOT making any power either ?

It's when you start making POWER with those Big arms in the stock Blocks with "REAL" Heads.... for any length of time....that things start get "interesting" ?

No matter,
the Stealth Heads, even the CNC, are pretty limited power-wise on anything above 500", so you would probably be fine without busting the Mains.

You can NOT exceed the power the Heads are capable of, NO MATTER how big you make the Engine underneath the Heads....

just for example, assuming same Heads and Cam around 240*-250* @ .050 duration....
* You can have a 451 cubic inch that makes 550-600hp at 56-5700 rpm
* You can have a 500 cubic inch that makes 550-600hp at 53-5400 rpm
* You can have a 540 cubic inch that makes 550-600hp at 49-5000 rpm

Yes, you CAN get alot of Torque, and you can cheat it somewhat hp-wise, but not much from the example above.....and no FUN having to shift like it's a TRUCK motor ?
if U know what I mean here....

Well Said!! I mean what's the Rod to piston Ratio on a 4.5-4.750 Crank anyway? Like 1.2 or something? Trying to shove the piston right out the side of the block.
This is why I don't like the newer HEMI engines. 4" SB Chevy bores, and the only way to get 440 C.I. is with something like a 4.750 stroke crank...Damn, that has to be hard on the block/pistons.

[BSB67]

"Fitting", the Big Arms in the stock Blocks is NOT the problem........at least not as long as you are NOT making any power either ?

It's when you start making POWER with those Big arms in the stock Blocks with "REAL" Heads.... for any length of time....that things start get "interesting" ?

No matter,
the Stealth Heads, even the CNC, are pretty limited power-wise on anything above 500", so you would probably be fine without busting the Mains.

You can NOT exceed the power the Heads are capable of, NO MATTER how big you make the Engine underneath the Heads....

just for example, assuming same Heads and Cam around 240*-250* @ .050 duration....
* You can have a 451 cubic inch that makes 550-600hp at 56-5700 rpm
* You can have a 500 cubic inch that makes 550-600hp at 53-5400 rpm
* You can have a 540 cubic inch that makes 550-600hp at 49-5000 rpm

Yes, you CAN get alot of Torque, and you can cheat it somewhat hp-wise, but not much from the example above.....and no FUN having to shift like it's a TRUCK motor ?
if U know what I mean here....

Well Said!! I mean what's the Rod to piston Ratio on a 4.5-4.750 Crank anyway? Like 1.2 or something? Trying to shove the piston right out the side of the block.
This is why I don't like the newer HEMI engines. 4" SB Chevy bores, and the only way to get 440 C.I. is with something like a 4.750 stroke crank...Damn, that has to be hard on the block/pistons.

Presume you mean the rod /stroke ratio.  1.58,  not that much different than a 350 Chevy that will go 200,000 mi.  Of course it won't go that far, but not because of the rod stroke ratio.