57 De Soto S25 - S26 Question

macedon Posted 2017-06-06 8:04 AM (#541604) Subject: 57 De Soto S25 - S26 Question Elite Veteran Posts: 963 Location: San Antonio, TX What are the differences between the S25 and S26 341's? Of course the intake manifold and carb. Anything else like the cam or other things that are different? I'm looking at what it will take to build up the motor for my Fireflite. I have Firedome S25 I bought a while back. springsweptwing Posted 2017-06-06 9:32 AM (#541609 - in reply to #541604) Subject: Re: 57 De Soto S25 - S26 Question Elite Veteran Posts: 1141 Location: Blackpool, United Kingdom. As far as i worked out a S25 is a bored out 330 and a S26 is a different casting same as used in the 345? NM Desoto Posted 2017-06-06 11:42 AM (#541614 - in reply to #541604) Subject: RE: 57 De Soto S25 - S26 Question Veteran Posts: 145 The S25 & S26 engines are pretty much the same, the same cam and pistons. The distributor weight springs are different along with the four barrell carburator. springsweptwing Posted 2017-06-06 3:41 PM (#541632 - in reply to #541614) Subject: Re: 57 De Soto S25 - S26 Question Elite Veteran Posts: 1141 Location: Blackpool, United Kingdom. Differences between the S25 and S26, distributor advance, S25 uses a IBP-4001, S26 use a IBP-4001A, Edited by springsweptwing 2017-06-06 3:44 PM macedon Posted 2017-06-07 5:20 PM (#541729 - in reply to #541604) Subject: Re: 57 De Soto S25 - S26 Question Elite Veteran Posts: 963 Location: San Antonio, TX Thanks!