352 to 390 conversion
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352 to 390 conversion
I want to replace my very tired 352 with a rebuilt 390. I also need to replace the clutch. with a complete clutch kit. I have a 66 F100. What considerations regarding clutch, transmission, and pilot bearing do I need to consider? thanks ahead of time
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
DIdn't you ask this in the FE forum too? Either that, or someone else asked the exact same question 
Should be a straight swap.
The pilot bearing, I'd make sure was the same before installing the motor.
Otherwise, yeah, same thing.
What I'd do is use the flywheel from the 352, and get the clutch for the correct year 352. Otherwise, there might be a size difference, but nothing huge enough to care about.
Was the 390 rebuilt already? If you can, get the 390 rebuilt and balanced, WITH the 352 flywheel on it. Less vibrations that way.
Should be a straight swap.
The pilot bearing, I'd make sure was the same before installing the motor.
Otherwise, yeah, same thing.
What I'd do is use the flywheel from the 352, and get the clutch for the correct year 352. Otherwise, there might be a size difference, but nothing huge enough to care about.
Was the 390 rebuilt already? If you can, get the 390 rebuilt and balanced, WITH the 352 flywheel on it. Less vibrations that way.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
i agree with Krewat, also if the motor is getting rebuilt do some head work and upgrade the cam. the 390 will really wake up from these small changes and be a runner for sure. also run long tube headers on that motor.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
The pilot bearing, I'd make sure was the same before installing the motor.
Otherwise, yeah, same thing.
What I'd do is use the flywheel from the 352, and get the clutch for the correct year 352. Otherwise, there might be a size difference, but nothing huge enough to care about.
Was the 390 rebuilt already? If you can, get the 390 rebuilt and balanced, WITH the 352 flywheel on it. Less vibrations that way.
Otherwise, yeah, same thing.
What I'd do is use the flywheel from the 352, and get the clutch for the correct year 352. Otherwise, there might be a size difference, but nothing huge enough to care about.
Was the 390 rebuilt already? If you can, get the 390 rebuilt and balanced, WITH the 352 flywheel on it. Less vibrations that way.
This same flywheel was also used in 1965/67 Galaxie/LTD's with the 352.
----------------------------------------------------------------------
The 390 flywheel (C5AZ6375L) uses a 11 1/2" clutch on a 12 7/8" diameter bolt circle.
The same 390 flywheel was used on cars from 1965 thru 1971, F100/350's from 1968 thru 1976.
Either flywheel will work on a 352, 360, or 390.
---------------------------------------------
The original (1958/70) pilot bearing for all the FE engines was bronze: B8AZ7600A = 1 7/8" O.D. / 11/16" I.D.
In 1971, Ford replaced the bronze bearing with a sealed roller bearing: D1TZ7600A.
In 1978, Ford replaced D1TZ7600A with D8TZ7600A which is also a sealed roller bearing.
The truck in my signature still has its original 352 flywheel.
The original 352 engine was bored and stroked to a 390 in 1982 when the truck underwent a frame off restoration.
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