66 valiant with newer slant six

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moparkrazed

Moparkrazed
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Hey guys working on a checklist. I’m looking at swapping my 170 for a 225. If I get a 67/68 up 225 I would need to get a bigger flywheel, swap over the oil pan and pick up, and make the exhaust pipe a little longer. Could I swap my intake and keep my current carb/intake and throttle?
 
Your intake/card/throttle should fit with no issues.
 
Yes, if you go to a 2 or 4 barrel carb you have to do a different throttle and linkage. The bolt-in is to find an early A V8 and get the parts from that. Otherwise a later pedal will work but you have to drill mounting holes.
 
Hey guys working on a checklist. I’m looking at swapping my 170 for a 225. If I get a 67/68 up 225 I would need to get a bigger flywheel, swap over the oil pan and pick up, and make the exhaust pipe a little longer. Could I swap my intake and keep my current carb/intake and throttle?
You will need to check the end of the crank to see if it's been machined for a stock pilot bushing. If not, use the later magnum pilot BEARING that will fit in the converter register. The difference on the flywheel will be the center hole diameter. Just get the '68-up flywheel for the newer engine.
 
Hey guys working on a checklist. I’m looking at swapping my 170 for a 225. If I get a 67/68 up 225 I would need to get a bigger flywheel, swap over the oil pan and pick up, and make the exhaust pipe a little longer. Could I swap my intake and keep my current carb/intake and throttle?

No need to replace the flywheel - just machine the hole bigger so that it fits a later crank. Bolts are in the same place. Did that on my old 65 Valiant with 170 when I swapped in a mid-seventies 225.
 
Yes, if you go to a 2 or 4 barrel carb you have to do a different throttle and linkage. The bolt-in is to find an early A V8 and get the parts from that. Otherwise a later pedal will work but you have to drill mounting holes.
Oh ok maybe that’s what I was seeing. Kind of on the fence on what to do. Between doing a 225 with a bigger carb or just rebuild the 170. It’s the original motor so didn’t want to slug a rod through it and maybe replace with a 225 for fun. The trans I have isn’t going to hit up to too much power. Thanks for all the help man.
 
You will need to check the end of the crank to see if it's been machined for a stock pilot bushing. If not, use the later magnum pilot BEARING that will fit in the converter register. The difference on the flywheel will be the center hole diameter. Just get the '68-up flywheel for the newer engine.
Thanks for the info man. Trying to keep notes for when I get ready to get a motor to rebuild.
 
No need to replace the flywheel - just machine the hole bigger so that it fits a later crank. Bolts are in the same place. Did that on my old 65 Valiant with 170 when I swapped in a mid-seventies 225.
Thanks man. I’ll consider that option. Trying to track down a 225. My manual 3 speed prob won’t hold up to a lot of power but would be nice to have a 2 barrel carb at least. Sounds like if I do that I’ll need to grab the v8 throttle and plate and get that bolted up. Not as bad as I thought it was going to be.
 
Thanks man. I’ll consider that option. Trying to track down a 225. My manual 3 speed prob won’t hold up to a lot of power but would be nice to have a 2 barrel carb at least. Sounds like if I do that I’ll need to grab the v8 throttle and plate and get that bolted up. Not as bad as I thought it was going to be.

For a while, I ran an early seventies all synchro three speed with factory floor shifter. Can't remember for sure if it bolted to the original bellhousing but I think it did. It worked well, but I did later run across an early slant six cast iron four speed bellhousing and used it to swap in a four speed with 3.09 low gear. With minor suspension and engine mods, it was one of the most fun driving cars ever.
 
For a while, I ran an early seventies all synchro three speed with factory floor shifter. Can't remember for sure if it bolted to the original bellhousing but I think it did. It worked well, but I did later run across an early slant six cast iron four speed bellhousing and used it to swap in a four speed with 3.09 low gear. With minor suspension and engine mods, it was one of the most fun driving cars ever.
That’s cool. I’m looking forward to getting it going but it’s going to be a while.
 
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