Eagle 4.25" stroker crank

-
360duster

360duster

Well-Known Member
Joined
Nov 23, 2008
Messages
1,588
Reaction score
798
Location
Bavaria / Germany
Uses small block chevrolet 6.2 inch minimum rod length, so there are probably some lightweight rods that wouldn't need much block clearancing. What cylinder heads are you using or are you planning on with these?
 
Last edited:
I went from a 4" to a 4.125" stroke just to get a few more cubic inches, rpm wise I was expecting it to not like much past 6k but it has proven it goes quicker shifting into the 7k range. I don't have any regrets going with the bigger arm.
Click to expand...
 
Garrett Ellison said:
Uses small block chevrolet 6.2 inch rods, so there are probably some lightweight rods that wouldn't need much clock clearancing. What cylinder heads are you using or are you planning on with these?
Click to expand...
It´s just sth. in my mind if i update my engine. I do have a good set of Indy rectangular port heads with their intake, still running a scat cast crank and KB hyper pistons - one day i´ll change this stuff out. I know there´s also the Molnar Crank / Rods with the smaller Honda Journals, just curious because i never heard about somebody doing a build with this eagle crank.
 
It would have to be worth something just because of reduction in piston mass. Use a 6.3 inch or the longest available rod to maximize that benefit.
 
You’ve got enough cylinder head to support it, so I would say to “GO FOR IT!” But.. like yourself I would want to see someone else find any potential reliability issues first.
 
not only reliability issues....it´s more the clearancing work and parts combinations that i´d like to know. Rod Bloomer sold some 4.25" cranks and complete assemblies....so i´m pretty sure some guys here did such "big SB strokers".
 
360duster said:
Hello Guys, just found out that Eagle has got a forged SBM crank with 4.250" stroke length:

[/URL]

Anybody did a stroker with this one and could supply the used parts / info about how much clearance work was necessary in a production block?

Running a 4" stroke at the moment, just thinking about future upgrades.

Michael
Click to expand...
There's a lot of these engines out there. Rod used to sell these cranks and he sold out of them. My Bloomer headed engine with the 4.125" crank still revs good. But I figure you'd at least need the next higher hp head after the Bloomers. But it might surprise you.
 
An acquaintance of mine ran a 471" sbm for several years. No durability problems that I know of. Nine second street driven 71 demon. The one pass heads up against him, I got to the finish line first..... but I had to redlight to do it, lol .
His 501 (or was it 502?) sbm didn't last. Too many too-light components.
The bigger the small block you build the bigger/better heads you need.
Don't put a 225cfm head on a 440 inch motor like Mopar did.
 
33IMP said:
An acquaintance of mine ran a 471" sbm for several years. No durability problems that I know of. Nine second street driven 71 demon. The one pass heads up against him, I got to the finish line first..... but I had to redlight to do it, lol .
His 501 (or was it 502?) sbm didn't last. Too many too-light components.
The bigger the small block you build the bigger/better heads you need.
Don't put a 225cfm head on a 440 inch motor like Mopar did.
Click to expand...
Think his 500 inch smallblock Demon ran 9.90’s if I remember right
 

33IMP said:
An acquaintance of mine ran a 471" sbm for several years. No durability problems that I know of. Nine second street driven 71 demon. The one pass heads up against him, I got to the finish line first..... but I had to redlight to do it, lol .
His 501 (or was it 502?) sbm didn't last. Too many too-light components.
The bigger the small block you build the bigger/better heads you need.
Don't put a 225cfm head on a 440 inch motor like Mopar did.
Click to expand...

Ron always built clean stuff.
 
Just ask a friend who put one together. Not hard to get it to fit. He can’t remember if it was an Eagle crank(old as dirt) no reliability issues at all.
 
33IMP said:
The bigger the small block you build the bigger/better heads you need.
Don't put a 225cfm head on a 440 inch motor like Mopar did.
Click to expand...
LMAO!

I will say that when the only head to port was the iron head with 300 or so cfm, the 440 would run really well. I don’t see an issue with a BIG stroker small block being much different despite what we know we are leaving on the table.

A very well ported W2/5 would make good power.
Though we know a W-7-8-9 or a Victor head would kill it.
 
33IMP said:
The stainless bolt-together headers he built for his 71 were works of art. So was the rest of the car.
So was Silvaliant. That thing ran hard with an out of the box crate 360.
Click to expand...
I believe “Silvaliant” is in Havasu. East coast Mopar reached out about dropping in for a visit as he was flying out via Vegas to seal the deal. Seller backed out at the last minute
 
A body said:
I believe “Silvaliant” is in Havasu. East coast Mopar reached out about dropping in for a visit as he was flying out via Vegas to seal the deal. Seller backed out at the last minute
Click to expand...
That was me, lol.
The car is owned by a guy in Rancho Cucamonga and is stored in Havasu.
 
rumblefish360 said:
LMAO!

I will say that when the only head to port was the iron head with 300 or so cfm, the 440 would run really well. I don’t see an issue with a BIG stroker small block being much different despite what we know we are leaving on the table.

A very well ported W2/5 would make good power.
Though we know a W-7-8-9 or a Victor head would kill it.
Click to expand...
Just think what a set of the P5 heads could do on a 4.25" stroke.....
 
Bobzilla said:
Pretty sure I saw an article saying Ritter is offering a version of his cast iron block to make that happen with P5 heads. Sounds pretty cool.
Click to expand...
Yes sir, Cast iron and aluminum both I think.
 
You must log in or register to reply here.
-
Back
Top Bottom