391
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Fleet Mechanic
Joined: Feb 2015
Posts: 1,662
Likes: 111
From: southwest missouri
391
Ok I have never heard of a 391 but the seller say's it is an industrial engine with a steel crank . Also said that many parts will interchange. I just saw this yesterday and have never heard of a 391 but that does not mean anything. I would like to add to my collection of engines that don't run at the moment but I like them as garage art. I do not have an FE sitting in the shop I need one and also a nailhead.
(Update) I have seen some on the web here and will do more research. If anyone knows anything about them let me know.
Thanks
(Update) I have seen some on the web here and will do more research. If anyone knows anything about them let me know.
Thanks
Last edited by artscott61; Jan 13, 2019 at 09:17 AM. Reason: more info
Super Moderator
Joined: Apr 2004
Posts: 34,475
Likes: 2,800
The 391 is designated as an "FT", and is a medium truck engine. It shares the same basic design with the FE engines but interchange is limited. No major components interchange. A Google search or a stroll through this forum will tell you more.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
The block and rods interchange.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
Cranks interchange as well, FT steel cranks can be machined to work in FE's. FE cranks were used in FT's as well.
Super Moderator
Joined: Apr 2004
Posts: 34,475
Likes: 2,800
You can swap parts around if you have the decoder ring on what goes with what. Not sure the OP is going that deep, but I simply seek to avoid encouraging people to think that a simple change or two will make the FT slide right into their pickup.
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Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
Define "interchange". FE crank goes to FT with a bushing or FE front cover. FT crank won't go to FE without front cover change or machine work.
You can swap parts around if you have the decoder ring on what goes with what. Not sure the OP is going that deep, but I simply seek to avoid encouraging people to think that a simple change or two will make the FT slide right into their pickup.
You can swap parts around if you have the decoder ring on what goes with what. Not sure the OP is going that deep, but I simply seek to avoid encouraging people to think that a simple change or two will make the FT slide right into their pickup.
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Cargo Master
Joined: Dec 2015
Posts: 2,541
Likes: 322
From: Harned, Ky
The 352/360 FE crank was used in the 330 medium duty FT engine, no FE crank was used in any of the heavy duty FT engines.
You can bush the distributor pilot hole in a FT block to build a FE engine.
To use a FT HD crank in a FE the flywheel mounting flange needs machining plus the crank snout needs turned down to FE size and new key ways cut for the timing chain and balancer.
The key ways must be cut in the correct location for proper timing gear and balancer alignment. Cost to convert a FT HD crank for FE use is high.
FT HD heads, intakes and exhaust manifolds will not interchange with some part from a FE.
The only direct swap parts between a FE and FT are rods, push rods and rocker assemblies.
You can bush the distributor pilot hole in a FT block to build a FE engine.
To use a FT HD crank in a FE the flywheel mounting flange needs machining plus the crank snout needs turned down to FE size and new key ways cut for the timing chain and balancer.
The key ways must be cut in the correct location for proper timing gear and balancer alignment. Cost to convert a FT HD crank for FE use is high.
FT HD heads, intakes and exhaust manifolds will not interchange with some part from a FE.
The only direct swap parts between a FE and FT are rods, push rods and rocker assemblies.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
The 352/360 FT crank was used in the 330 medium duty FT engine, no FE crank was used in any of the heavy duty FT engines.
You can bush the distributor pilot hole in a FT block to build a FE engine.
To use a FT HD crank in a FE the flywheel mounting flange needs machining plus the crank snout needs turned down to FE size and new key ways cut for the timing chain and balancer.
The key ways must be cut in the correct location for proper timing gear and balancer alignment. Cost to convert a FT HD crank for FE use is high.
FT HD heads, intakes and exhaust manifolds will not interchange with some part from a FE.
The only direct swap parts between a FE and FT are rods, push rods and rocker assemblies.
You can bush the distributor pilot hole in a FT block to build a FE engine.
To use a FT HD crank in a FE the flywheel mounting flange needs machining plus the crank snout needs turned down to FE size and new key ways cut for the timing chain and balancer.
The key ways must be cut in the correct location for proper timing gear and balancer alignment. Cost to convert a FT HD crank for FE use is high.
FT HD heads, intakes and exhaust manifolds will not interchange with some part from a FE.
The only direct swap parts between a FE and FT are rods, push rods and rocker assemblies.
Cargo Master
Joined: Dec 2015
Posts: 2,541
Likes: 322
From: Harned, Ky
Yes 330 medium duty used a standard 352/360 FE crank.
Never worked on 359/361 engines but they have the same stroke as the 330.
389 is a emissions detuned 391 that only came with the big snout steel FT crank, I've worked on a lot of these engines and have never seen one with a small snout FE crank.
Never worked on 359/361 engines but they have the same stroke as the 330.
389 is a emissions detuned 391 that only came with the big snout steel FT crank, I've worked on a lot of these engines and have never seen one with a small snout FE crank.
. Just messen with ya. Summer is just around the corner guys.