Previous Thread
Next Thread
Print Thread
6.1 Stroker Choices: 4.0x or 4.25? #2467857
03/17/18 08:40 PM
03/17/18 08:40 PM
Joined: Feb 2010
Posts: 153
MI, USA
M
moparmitch Offline OP
member
moparmitch  Offline OP
member
M

Joined: Feb 2010
Posts: 153
MI, USA
Ok, if stroking a 6.1 block, is a 4.25 stroke too much? I like the idea of a 440 cid G3, but not at the expense of longevity...

This would be for a N/A motor using the stock intake, heads, and valvetrain with minimum upgrades needed to make things work, if needed.

This motor will be used in a 2700lb drag car with a 727 behind it. Stock rocker gear and lifters will be used, so an approximate shift rpm would be around 6500-7K (I'm assuming).

I see a lot of 4.0x stroked motors, and a few 4.25 setups. Is the rod angle really that much worse/detrimental at 4.25?

Are main and head studs an absolute necessity?

I ask because I have a very low mile 6.1 motor and would consider installing new parts without having to take the block back into a machine shop for additional machining operations. If anything, I would get the block sonic checked for peace of mind.

Do the piston oilers get removed/plugged when increasing stroke over stock?

Thanks!

Re: 6.1 Stroker Choices: 4.0x or 4.25? [Re: moparmitch] #2468478
03/19/18 09:14 AM
03/19/18 09:14 AM
Joined: Jan 2006
Posts: 1,400
Trumbauersville PA
ric3xrt Offline
pro stock
ric3xrt  Offline
pro stock

Joined: Jan 2006
Posts: 1,400
Trumbauersville PA
Read my response to
https://board.moparts.org/ubbthreads/ubbt...tml#Post2467812

I list the RR ratios in the 1st part of the message , 4.05 is your best bet for stroke.


Truth has no agenda, but those with an agenda make their own truth.
Some of us are so open minded they only see their View



Re: 6.1 Stroker Choices: 4.0x or 4.25? [Re: ric3xrt] #2468574
03/19/18 01:49 PM
03/19/18 01:49 PM
Joined: Feb 2010
Posts: 153
MI, USA
M
moparmitch Offline OP
member
moparmitch  Offline OP
member
M

Joined: Feb 2010
Posts: 153
MI, USA
Excellent info...Thanks for rundown and great details, much appreciated!

Re: 6.1 Stroker Choices: 4.0x or 4.25? [Re: moparmitch] #2468614
03/19/18 03:28 PM
03/19/18 03:28 PM
Joined: Jan 2005
Posts: 12,408
Kalispell Mt.
H
HotRodDave Offline
I Live Here
HotRodDave  Offline
I Live Here
H

Joined: Jan 2005
Posts: 12,408
Kalispell Mt.
I would go 4.05 for any kind of street motor and consider 4.25 very serious race only, just because something can be done doesn't mean it should be done. The 4.25 is OK in a SB because of the tall deck height.


I am not causing global warming, I am just trying to hold off a impending Ice Age!









Powered by UBB.threads™ PHP Forum Software 7.7.1