Offset ground crank 384 ?s
05-26-2006, 07:22 PM
#1
TECH Addict
Thread Starter
iTrader: (16)
Join Date: Jul 2004
Location: Nevada, TX
Posts: 2,218
Likes: 0
Received 0 Likes
on
0 Posts
Offset ground crank 384 ?s Firstly, who are you guys using to grind the cranks? Next what rods/piston combo are you running with it? I am debating on running a 370 all bore, or 384. Could go with a 408, but I want higher revving street engine, more than a torque monster. Also want to keep the piston FPS lower than a 4.00 stroke. This will be a super max street engine, objectively running about 11.75:1 compression. Already have an iron longblock, just deciding what to do with it.
Brandon
Brandon
05-26-2006, 10:19 PM
#2
TECH Addict
Thread Starter
iTrader: (16)
Join Date: Jul 2004
Location: Nevada, TX
Posts: 2,218
Likes: 0
Received 0 Likes
on
0 Posts
Edit to original post.............
Am I right thinking that a 6.0 crank will not work for a camaro with A4/M6?
Just dawned on me after talking to a buddy. If so, that may change my thought process.
Brandon
Am I right thinking that a 6.0 crank will not work for a camaro with A4/M6?
Just dawned on me after talking to a buddy. If so, that may change my thought process.
Brandon
05-26-2006, 10:32 PM
#3
Well the 385 cubic inch 6.0 is not only a off set crank it is also a 4.060 bore.
If anything ever happens to the motor the motor will be toast as you wont have any room to rebore the cylinders.
LME can do it as we talked about it back in the day when I was considering the same build. I believe the rod length was like 6.1 but cant remember exactly as I never had that combo built and went a different route.
That 370 combo will make very similar power and will be cheeper, safer and if there is ever a problem a new block wont be needed.
The offset crank makes it a 3.72" stroke again my memory isn't working real well tonight but I believe thats what it was. Also it was like 385.26 cubic inches.
Now maybe a 4.030 or 4.040 bore with the offset crank would work well.
Still have 380+ cubes and can reuse the block is something happens.
Just some suggestions.
If anything ever happens to the motor the motor will be toast as you wont have any room to rebore the cylinders.
LME can do it as we talked about it back in the day when I was considering the same build. I believe the rod length was like 6.1 but cant remember exactly as I never had that combo built and went a different route.
That 370 combo will make very similar power and will be cheeper, safer and if there is ever a problem a new block wont be needed.
The offset crank makes it a 3.72" stroke again my memory isn't working real well tonight but I believe thats what it was. Also it was like 385.26 cubic inches.
Now maybe a 4.030 or 4.040 bore with the offset crank would work well.
Still have 380+ cubes and can reuse the block is something happens.
Just some suggestions.
05-26-2006, 11:03 PM
#4
LSxGuy widda 9sec Mustang
iTrader: (12)
Join Date: Nov 2001
Location: Texas and Qatar
Posts: 3,043
Likes: 0
Received 0 Likes
on
0 Posts
If you use a 6L crank you want the '01+ crank as its the same length as the 5.7L cranks. We had some stock 5.7L cranks offset ground to 3.820" stroke a few years ago to build 392-396ci strokers and ran them at around 750rwhp on N20 with no issues. Made about 485rwhp on motor and I'm sure with todays heads/cam we would have been able to squeeze over 500.
Now that eagle cranks are out and priced reasonable, we havn't done another one since. I think we had paid anywhere from $400-$550 for the process depending on the quality of the work. We sent them out of state as the local places didn't want any part of that.
Now that eagle cranks are out and priced reasonable, we havn't done another one since. I think we had paid anywhere from $400-$550 for the process depending on the quality of the work. We sent them out of state as the local places didn't want any part of that.
05-26-2006, 11:11 PM
#5
TECH Addict
Thread Starter
iTrader: (16)
Join Date: Jul 2004
Location: Nevada, TX
Posts: 2,218
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by -Joseph-
If you use a 6L crank you want the '01+ crank as its the same length as the 5.7L cranks. We had some stock 5.7L cranks offset ground to 3.820" stroke a few years ago to build 392-396ci strokers and ran them at around 750rwhp on N20 with no issues. Made about 485rwhp on motor and I'm sure with todays heads/cam we would have been able to squeeze over 500.
Now that eagle cranks are out and priced reasonable, we havn't done another one since. I think we had paid anywhere from $400-$550 for the process depending on the quality of the work. We sent them out of state as the local places didn't want any part of that.
Now that eagle cranks are out and priced reasonable, we havn't done another one since. I think we had paid anywhere from $400-$550 for the process depending on the quality of the work. We sent them out of state as the local places didn't want any part of that.
Brandon
05-26-2006, 11:35 PM
#6
LSxGuy widda 9sec Mustang
iTrader: (12)
Join Date: Nov 2001
Location: Texas and Qatar
Posts: 3,043
Likes: 0
Received 0 Likes
on
0 Posts
I'm sure that was with shipping and someone in the middle getting their cut as our engine builder sent them off for us. I can get a stock crank cut .010/.010 here for $80 at its cheapest but they weren't comfortable with offset grinding our stuff. When a machinist tells you that, you don't force them to learn on your stuff. You might be able to find someone to do it much cheaper than we paid though.
AFAIK all the Alum headed 6.0L motors have the normal 5.7L style crank in them as far as dimensions, they are not gundrilled like the nodular iron 5.7L cranks.
AFAIK all the Alum headed 6.0L motors have the normal 5.7L style crank in them as far as dimensions, they are not gundrilled like the nodular iron 5.7L cranks.
05-27-2006, 07:45 AM
#7
TECH Senior Member
I'm getting a 370 from LME this week, 05 style (short bolts) with 5.7 crank, callies rods and Wiseco nitrous pistons 2.2 cc VR.
This will end up as a 11.75 SCR 8.7 DCR, combo with a 232/234 113+0, + a healthy shot of juice.
Shortblck was drilled for f-body accesories with all plugs/dowels/pins.
4.030 bore, 3.622 crank. I'll be running LS6 PCV on it too.
I expect some good trq with it
This will end up as a 11.75 SCR 8.7 DCR, combo with a 232/234 113+0, + a healthy shot of juice.
Shortblck was drilled for f-body accesories with all plugs/dowels/pins.
4.030 bore, 3.622 crank. I'll be running LS6 PCV on it too.
I expect some good trq with it
Trending Topics
05-27-2006, 08:55 PM
#8
Originally Posted by xfactor_pitbulls
Thanks to both of you guys. I need to figure out what year model the block is out of (havent even gotten it yet). JZ, I was thinking the same as you to run 4.030 bore and offset grind. Isnt 4.030 bore and 3.8 stroke 387? Maybe my math was off..........Joseph, for $400-$500 you are not really far for what you can find an eagle crank for on here, thats alittle more than I thought. Especially figuring shipping both ways and everything.
Brandon
Brandon
You math looks good, I haven't personially seen a 3.8 stroke crank, only a 3.72. If I remember correctly I paid 300 for the one I had done about 3 years ago.
As said earlier, now that eagle has a crank that is decent and price real nicely there is a small price difference especially if you dont already own the crank.
Figure 200 for a crank, plus 300-450 for someone to resize it vs 900 for a eagle. Not much of a difference.
05-29-2006, 10:36 AM
#9
TECH Addict
Thread Starter
iTrader: (16)
Join Date: Jul 2004
Location: Nevada, TX
Posts: 2,218
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by JZ'sTA
You math looks good, I haven't personially seen a 3.8 stroke crank, only a 3.72. If I remember correctly I paid 300 for the one I had done about 3 years ago.
As said earlier, now that eagle has a crank that is decent and price real nicely there is a small price difference especially if you dont already own the crank.
Figure 200 for a crank, plus 300-450 for someone to resize it vs 900 for a eagle. Not much of a difference.
As said earlier, now that eagle has a crank that is decent and price real nicely there is a small price difference especially if you dont already own the crank.
Figure 200 for a crank, plus 300-450 for someone to resize it vs 900 for a eagle. Not much of a difference.
Brandon
05-13-2007, 09:44 PM
#13
Originally Posted by JZ'sTA
You math looks good, I haven't personially seen a 3.8 stroke crank, only a 3.72. If I remember correctly I paid 300 for the one I had done about 3 years ago.
As said earlier, now that eagle has a crank that is decent and price real nicely there is a small price difference especially if you dont already own the crank.
Figure 200 for a crank, plus 300-450 for someone to resize it vs 900 for a eagle. Not much of a difference.
As said earlier, now that eagle has a crank that is decent and price real nicely there is a small price difference especially if you dont already own the crank.
Figure 200 for a crank, plus 300-450 for someone to resize it vs 900 for a eagle. Not much of a difference.
