Eagle has got big stroker cranks for 360 / 5.9!

[360duster]

Hi Guys, during discussion with Eagle Sales Rep regarding a stroker Kit he mentioned that they now have 4.125" and 4.250" cranks readily available for 360 main size.

https://www.eaglerod.com/browse?category=293676

No complete rotating assemblies, but i thought i´d share this with you.

What Kind of Piston / Rod combination would work with that and a LA-Block? Chevy SB rod journal should make it easy to get. Regarding Pistons i have no clue what compression height would be necessary.

Michael

 

[jbc426]

Hughes Engines offers complete packages for 426 cubic inch small blocks. There may be more out there.

Hughes Engines

 

[Icetech]

Waiting on my block to be machined right now.. i looked at the 426 kits and people basically scream to not go over 4" but rarely a valid reason given...

 

[mygasser]

at 60 over the 4.25 crank gives you a 440 small block in a 360 block, more with a 340 block.
neil.

 

[33IMP]

MY opinion only!
To make a giant smallblock mopar worthwhile, it'll need a GREAT set of cylinder heads.
Most shelf smallblock heads are hard-pressed enough feeding 408.
I think I would settle for a 408, simply so I wouldn't have to spend $5k on heads. I don't think I would use less than a tf on a 408.

 

[Icetech]

BTW.. the Hughes kit is 4.180" stroke

MY opinion only!
To make a giant smallblock mopar worthwhile, it'll need a GREAT set of cylinder heads.
Most shelf smallblock heads are hard-pressed enough feeding 408.
I think I would settle for a 408, simply so I wouldn't have to spend $5k on heads. I don't think I would use less than a tf on a 408.

AHH... that's right the heads I have tf's already.. i am planning on just a 408 anyway.. seems to work fine for most people

 

[33IMP]

Ron Silva had an excellent running big inch small block Mopar. I don't remember if it was 468 or 471. It had GREAT heads on it. (W8?).

 

[Icetech]

Ron Silva had an excellent running big inch small block Mopar. I don't remember if it was 468 or 471. It had GREAT heads on it. (W8?).

468? jesus.... ritter i assume? And the W stuff seems insane.. i have brett millers vids pop up now and then and it's like a different world.. his are probably like 16:1 also though

 

[33IMP]

468? jesus.... ritter i assume? And the W stuff seems insane.. i have brett millers vids pop up now and then and it's like a different world.. his are probably like 16:1 also though

No, I think it was a R mopar race block.
Ron's was a street driven 9 second 71 Demon.
I sorta beat him once at Irwindale with my Cortina. I got to the finish line first, but had to red-light to do it, lol.
He went 6.45, I went 6.51. We both got faster.
(The new Demon redeye he has now is a mid 5 sec car.)

 

[Icetech]

No, I think it was a R mopar race block.
Ron's was a street driven 9 second 71 Demon.
I sorta beat him once at Irwindale with my Cortina. I got to the finish line first, but had to red-light to do it, lol.
He went 6.45, I went 6.51. We both got faster.
(The new Demon redeye he has now is a mid 5 sec car.)

you guys are nuts.. i just want a nice happy mid 11 street car

 

[273]

MY opinion only!
To make a giant smallblock mopar worthwhile, it'll need a GREAT set of cylinder heads.
Most shelf smallblock heads are hard-pressed enough feeding 408.
I think I would settle for a 408, simply so I wouldn't have to spend $5k on heads. I don't think I would use less than a tf on a 408.

I get what your saying, To me depends what your goals are, most seem to stroke to make X hp at lower rpms, most seem they would rather have a 500 hp 408 @ 5,800 rpm than a at 6,500 rpm with a 360, and maybe a 500 hp at 5,400 rpm with a 434 is to tame for some but could be desirable for others, especially the Max low end torque guys and or people that want to run 2.76-3.23 gears.

 

[9secRR]

Ron Silva had an excellent running big inch small block Mopar. I don't remember if it was 468 or 471. It had GREAT heads on it. (W8?).

it was 501''. i heard it was a custom 4.50'' crank.

 

[9secRR]

we have a 477'' aluminum block W8 waiting for a refresh. hope to get to it soon

 

[jbc426]

I get what your saying, To me depends what your goals are, most seem to stroke to make X hp at lower rpms, most seem they would rather have a 500 hp 408 @ 5,800 rpm than a at 6,500 rpm with a 360, and maybe a 500 hp at 5,400 rpm with a 434 is to tame for some but could be desirable for others, especially the Max low end torque guys and or people that want to run 2.76-3.23 gears.

Yah, but then there's always those guys running 408s that want 500hp at 3850 rpm, and on up from there. Because ?

 

[Icetech]

Yah, but then there's always those guys running 408s that want 500hp at 3850 rpm, and on up from there. Because ?

View attachment 1716465049

i'm one of those guys.. my car is a street car and 500hp is plenty for me to drive around, and a 408 will do it easier and with less stress/more drivability than a 318 or 360... so why not?

P.S. i mean i want 500 total.. not by 3800 and keep climbing had to read it twice sorry

 

[273]

Yah, but then there's always those guys running 408s that want 500hp at 3850 rpm, and on up from there. Because ?

View attachment 1716465049

And there's people that would add twin turbos to that, like I said it all depends what you want.

 

[360duster]

guys, just wanted to share the new to me information.....of course this is not everyones cup of tea. I´m planning a upgrade from my low cost (cast crank, hypereutectic pistons) 408 kit, so to me the bigger stroke would be an option if the other parts are readily available. And yes, heads play a big role if you want to go fast....i ported a set of magnums that ran 11.16 on a 416 last weekend, on my engine i run IMM ported indy rectangular port heads.

I was aware of the hughes kit, i think they use Molnar stuff. Molnar lists the same stroke crank with Honda pins on their website.

 

[33IMP]

it was 501''. i heard it was a custom 4.50'' crank.

That was in his next car, the Silvaliant. He went overboard with the lightest parts he could, and the 501 didn't last long.
Other than his late model Challenger stuff, I was most impressed with his 71 demon. Silvaliant was drop dead gorgeous, and even fairly fast with the crate 360 that it got after the 501 got hurt.

 

[Icetech]

So.. i am curious.. for a street car that wants a nice power curve and not max rpm/hp how much do smaller heads hold you back below like 6000rpm? i'm talking like 280@.500 vs. 310ish@.500? Does the extra flow come more into play at a higher rpm?

 

[273]

So.. i am curious.. for a street car that wants a nice power curve and not max rpm/hp how much do smaller heads hold you back below like 6000rpm? i'm talking like 280@.500 vs. 310ish@.500? Does the extra flow come more into play at a higher rpm?

A 408 VS 434 if VE% and efficiency was similar for both the 434 would need about 300-400 rpm less to reach peak hp.

Quick math is old Cid x rpm / new Cid = new rpm based off if efficiency is similar which it obviously can be different, but it should ballpark it.

 

[Icetech]

A 408 VS 434 if VE% and efficiency was similar for both the 434 would need about 400 rpm less at peak hp.

Quick math is old Cid x rpm / new Cid = new rpm based off if efficiency is similar which it obviously can be different, but it should ballpark it.

Other way around thoguh.. 408 with say 280 heads vs. 310 heads, would you see pretty much the same power to X RPM then a drop off.. or a loss/gain across the whole sweep? Like.. at 3800 rpm would the 310s make more power if the 280s are already supplying what the motor can take?

 

[33IMP]

So.. i am curious.. for a street car that wants a nice power curve and not max rpm/hp how much do smaller heads hold you back below like 6000rpm? i'm talking like 280@.500 vs. 310ish@.500? Does the extra flow come more into play at a higher rpm?

I don't know the definitive answer to that.
But EM did a comparison test of 270 tf bbm verses 240. (On a 440)
The 270 was better everywhere, even low end torque.
To me, the question is also when is too much. Chevy put 320 cc heads that way outflow 440 iron heads, on a 396, and it was a pretty good combo.
Building a torque combo for a pickup? Magnum heads that aren't cracked should be fine.
For a 500hp street fun engine, I think I'd want as much head as I could afford, within reason.

 

[273]

Other way around thoguh.. 408 with say 280 heads vs. 310 heads, would you see pretty much the same power to X RPM then a drop off.. or a loss/gain across the whole sweep? Like.. at 3800 rpm would the 310s make more power if the 280s are already supplying what the motor can take?

I miss read your post, I was basing it off if both were built similar.

 

[Icetech]

I don't know the definitive answer to that.
But EM did a comparison test of 270 tf bbm verses 240. (On a 440)
The 270 was better everywhere, even low end torque.
To me, the question is also when is too much. Chevy put 320 cc heads that way outflow 440 iron heads, on a 396, and it was a pretty good combo.
Building a torque combo for a pickup? Magnum heads that aren't cracked should be fine.
For a 500hp street fun engine, I think I'd want as much head as I could afford, within reason.

yeah, i have my heads already.. was always just curious bout that.. where is the point of diminishing returns for heads/cam for a street motor.. although everyones version of a street motor is different.. my only goal is enough to be fun.. but mundane enough to beat the **** out of for years without worrying bout parts exiting

 

[33IMP]

I sure would not worry about TF heads being too big for a 408.
I've got 20 year old sbc heads that flow more, on a 350.