Is a 5.7 based 426 possible?

[USCG Charger]

Jasons Inertia 383? Is there another 11.5sec 5.7 Stroker?

Soon I hope

Yes my lil ole 838 CI goes 11.56 @ 119 to me exact.

4" bore
3.79 stroke

[Gabe]

Some great info ....

If I wanted more cubes while leaving the bore stock, what's the biggest stroke increase a 5.7 will handle safely, while still revving to 6000-6400 ?


And would that be different for an AWD application, where the oil pan is different to clear a front axle shaft ...

[white lightning]

Why 392's are running 11.5x's NA right up there with the 426's

And to go a step further Hemi~C~'s Blown 392 ran 9.85 which no other car has done on this forum..........426 or 440

good to know the 392 is so strong.

I thought the 34 extra cid of a 426 would make more power than they actually do.

the bigger stroke, smaller bore, more torque & more bottom end, less top end of a 5.7/392 would be my choice for my heavy-azz QC truck.

[white lightning]

A 4.250" in a 5.7 is not a combination we would advise.

The 4.080 with a 4.000” or a 4.015” (6.7L, 410 CID; 6.8L, 413 CID) is really the most you can get out of a 5.7L safely.

You can very comfortably get 500 HP out of the NA 410 in an ’09 R/T while keeping VCT; more if you’re willing to dump VCT and MDS…

thanks for answering!

[RobAGD]

A lot of this really comes down to what HP or TQ god you pray to.

if you or your machine shop do their due diligence you can spec out a engine with a decent over bore. Some of the 5.7 blocks seem to have a ton of meat in them and COULD support a 4.08 bore but I think to find one of those you would need to go through more than a few blocks to find one.

The 4.25 stroke leaves very very little piston in the bore and has very short skirts to clear the crank counter weights. If you were building something for racing only not seeing a ton of miles and you wanted cubes over everything else it could be build but you would be in uncharted lands with that.

The 6.1 blocks have a bit more beef in them, some slightly different oil lay out.

What are your goals and intentions for the engine ?

-Robert

[white lightning]

A lot of this really comes down to what HP or TQ god you pray to.

if you or your machine shop do their due diligence you can spec out a engine with a decent over bore. Some of the 5.7 blocks seem to have a ton of meat in them and COULD support a 4.08 bore but I think to find one of those you would need to go through more than a few blocks to find one.

The 4.25 stroke leaves very very little piston in the bore and has very short skirts to clear the crank counter weights. If you were building something for racing only not seeing a ton of miles and you wanted cubes over everything else it could be build but you would be in uncharted lands with that.

The 6.1 blocks have a bit more beef in them, some slightly different oil lay out.

What are your goals and intentions for the engine ?

-Robert

my goal is a fast, powerful, daily-driver street truck with a lot of low-end power, which is why I posted this up the page:
"the bigger stroke, smaller bore, more torque & more bottom end, less top end of a 5.7/392 would be my choice for my heavy-azz QC truck."

got a pretty good idea what specs I want on a custom cam for the motor too.

I see why a 4.25" stroke is too much for a 5.7 block.

a Callies 4.05" stroke 5.7/392 or K1 4.08" stroke 5.7/392 balanced rotating assembly are what I plan to use.

thanks for your thoughts!

[CoolVanilla]

a Callies 4.05" stroke 5.7/392 or K1 4.08" stroke 5.7/392 balanced rotating assembly are what I plan to use.

Get your block of choice sonic tested, and have a backup lined up in case you need it. Also, kiss off the possibility of a rebuild; you won't have enough material to clean it up and have another go.

Having said that though, I do love mine. Too much torque actually.

[sergeo'shemi]

fyi those balanced assemblies need to be rebalanced

my goal is a fast, powerful, daily-driver street truck with a lot of low-end power, which is why I posted this up the page:
"the bigger stroke, smaller bore, more torque & more bottom end, less top end of a 5.7/392 would be my choice for my heavy-azz QC truck."

got a pretty good idea what specs I want on a custom cam for the motor too.

I see why a 4.25" stroke is too much for a 5.7 block.

a Callies 4.05" stroke 5.7/392 or K1 4.08" stroke 5.7/392 balanced rotating assembly are what I plan to use.

thanks for your thoughts!

[white lightning]

kiss off the possibility of a rebuild; you won't have enough material to clean it up and have another go.

why no rebuild? a 4.05 stroke only takes .010" over on a 5.7 block if you want a true 392, 4.08 stroke + .002-.003", whatever it takes to clean up cylinder taper = 394 cid.

Having said that though, I do love mine. Too much torque actually.

SWEET!

[white lightning]

fyi those balanced assemblies need to be rebalanced

good to know. thanks for the info!

[CoolVanilla]

fyi those balanced assemblies need to be rebalanced

x2

why no rebuild? a 4.05 stroke only takes .010" over on a 5.7 block if you want a true 392, 4.08 stroke + .002-.003", whatever it takes to clean up cylinder taper = 394 cid.

Sonic it and you'll see why.

[white lightning]

Sonic it and you'll see why.

most 5.7 blocks can handle .060" over, some can take .080" over, so why can't .010" over be rebuilt?

theoretically have .050" of material left to work with?

[CrazyManInCincy]

Any updates ?

[ric3xrt]

Well this was an interesting read, before I got heavily into the G3 engines I helped a friend do a 439 based 5.7 back in 2012 we started with a 04 5.7 block. a set of 4.055 CP pistons with 1.04 pin height and 6.077 length rods(also made by CP Nissan application) . blocked was paralleled decked to 9.25 , running assembly(yes it's different from static assembly) had a deck clearance of .005 ,we hard blocked the lower 2 inches of the water jacket. rod ratio works out to stomp pulling 1.43(SBC 400 is 1.48, plenty of them in the 100k+ mile club), Comp cams 268H 6.1 heads done by RLD , 2.125 intake valve and 1.625 Ex valve stock 6.1 intake ......it was not cheep to build,
it's in a 2007 300 as of this past summer(2019) it has just under 65k miles on the build 80 1/4 passes. runs mid 11s around 116-119 , on 87oct
Since 2016 I've done six 4.25 and two 4.30 stroke 5.7s with bores ranging from stock 3.917 to a 4.08(lots of hard block and we sonic checked 12 different blocks to get the right one but 444 Ci was worth it to him)
I would not boost any build with a 4.25 stroke. the better package is using 4.2 Compstar YY12E48 ,6.10 length rods and 1.04 Pin height Piston, I've done 4 so far this year.
Last week I finished up a 422Ci 5.7 , 4.00X4.20 ICON Ford Piston part # IC613 it's a true flat top ,so valve reliefs need to be machined in to them and they are 1.09 pin height , 6.125 Manley 300M rods ,Compstar 4.20 crank custom Cometec .120 thick head gaskets, Piston to head clearance is .055 dry so running will be around .051/.052 ,just over 12 to 1 compression , it's got Edelbrock heads(67cc) and a New Holly sniper intake. cam is low 600lift and it's just under 750hp NA. at 7100 RPMs.

Don't be afraid to build one...just remember new parts vs new parts it's not cost effective compared to 426Ci 6.1/6.4 build.