3900 crank in a 3.1 block
Moderators: The Dark Side of Will, Series8217
-
- Posts: 157
- Joined: Fri May 12, 2006 1:24 am
- Location: Hellevue, NE.
- Contact:
3900 crank in a 3.1 block
Since I have niether to check clearances...just from the numbers how would I be able to tell if a 3900 crank would fit in a 3.1 iron head block?
Does anybody know if it will?
If not what about a 3500 crank?
Does anybody know if it will?
If not what about a 3500 crank?
Clean Feet Pet Clean Up
Pet Waste Removal Omaha
We offer dog waste removal and cat waste removal services.
(402) 320-3824, We service the Omaha, Ne. metropolitan area.
Pet Waste Removal Omaha
We offer dog waste removal and cat waste removal services.
(402) 320-3824, We service the Omaha, Ne. metropolitan area.
- Series8217
- 1988 Fiero Track Car
- Posts: 6056
- Joined: Thu Jun 02, 2005 9:47 pm
- Location: Los Angeles, CA
- Shaun41178(2)
- Posts: 8571
- Joined: Fri Nov 19, 2004 7:12 pm
- Location: Ben Phelps is an alleged scammer
-
- Peer Mediator
- Posts: 15682
- Joined: Wed Nov 24, 2004 11:13 pm
- Location: In the darkness, where fear and knowing are one
- Contact:
- Series8217
- 1988 Fiero Track Car
- Posts: 6056
- Joined: Thu Jun 02, 2005 9:47 pm
- Location: Los Angeles, CA
It also has different bore spacing. Do the journals even line up?The Dark Side of Will wrote:The 3900 has the same stroke as the 3.1, but larger main and rod journals. You'd need to have EXTENSIVE machining done to the block in order to fit it.
Why do you want to do this? Are you just looking for a forged crank?
-
- Peer Mediator
- Posts: 15682
- Joined: Wed Nov 24, 2004 11:13 pm
- Location: In the darkness, where fear and knowing are one
- Contact:
- Series8217
- 1988 Fiero Track Car
- Posts: 6056
- Joined: Thu Jun 02, 2005 9:47 pm
- Location: Los Angeles, CA
-
- Posts: 605
- Joined: Tue Jun 14, 2005 10:13 am
- Location: Shaun's Head
.
Last edited by SappySE107 on Thu Jun 22, 2023 1:06 am, edited 1 time in total.
Every criticism, judgment, diagnosis, and expression of anger is the tragic expression of an unmet need. -Marshall Rosenberg
- Series8217
- 1988 Fiero Track Car
- Posts: 6056
- Joined: Thu Jun 02, 2005 9:47 pm
- Location: Los Angeles, CA
-
- Posts: 605
- Joined: Tue Jun 14, 2005 10:13 am
- Location: Shaun's Head
.
Last edited by SappySE107 on Thu Jun 22, 2023 1:05 am, edited 1 time in total.
Every criticism, judgment, diagnosis, and expression of anger is the tragic expression of an unmet need. -Marshall Rosenberg
-
- Peer Mediator
- Posts: 15682
- Joined: Wed Nov 24, 2004 11:13 pm
- Location: In the darkness, where fear and knowing are one
- Contact:
-
- Peer Mediator
- Posts: 15682
- Joined: Wed Nov 24, 2004 11:13 pm
- Location: In the darkness, where fear and knowing are one
- Contact:
So as the clarify, you're saying that the older heads will bolt to the new block, and that the older manifold will bolt to the new block and heads (not necessarily that the ports line up, just that the parts bolt on).SappySE107 wrote:It can be modified to fit. The bore spacing didn't change. We bolted a 3500 head to the 3900 block. The deck is wider but not longer or anything. You can fit the 3500 lower intake in there still as well so the valley didn't change. Its just further out.
There are some threads on 60V6 on the 3900 as well as the 3500 crank.
-
- Posts: 157
- Joined: Fri May 12, 2006 1:24 am
- Location: Hellevue, NE.
- Contact:
I was unaware that those cranks were forged I just thought they were steel, but yes a forged crank would be nice. Eagle makes a steel 2.8 crank, but I want a 3.1/3.4 crank.The Dark Side of Will wrote:Why do you want to do this? Are you just looking for a forged crank?
Clean Feet Pet Clean Up
Pet Waste Removal Omaha
We offer dog waste removal and cat waste removal services.
(402) 320-3824, We service the Omaha, Ne. metropolitan area.
Pet Waste Removal Omaha
We offer dog waste removal and cat waste removal services.
(402) 320-3824, We service the Omaha, Ne. metropolitan area.