Int/ext balance
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Lead Driver
Joined: Nov 2000
Posts: 6,635
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From: Albuquerque
Int/ext balance
I always thought that 351m and 400 engines were externally balanced. While checking out flex plates (for auto trans) I found two. One for internal balance and one with 28oz weight for exernall balance.
Did they actually come both ways?
Did they actually come both ways?
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
One for internal balance and one with 28oz weight for external balance.D1AZ-6375-A .. C6 Flexplate - 164 teeth / Obsolete
1971/79 FoMoCo Passenger Cars 400 / 1975/79 Ford/Merc Passenger Cars 351M*
1977/79 F100/350 351M/400 / 1978/82 Bronco 351M/400 / 1980/82 F150/350 351M/400.
*Some 1975/79 FoMoCo Passenger Cars with 351M's also came with C4's and FMX's.
Laughing Gas
Joined: Feb 2003
Posts: 1,234
Likes: 3
From: In the woods of Oregon
Yeah, by the numbers. But actual dimensions and balance are the same. Drop a 302(28oz) flexplate next to a 351c flexplate. The Same. Now the 351m/400 flexplate is different, but still 28 oz balance. Now if you had the rare 400 with the small block bolt pattern you could use a 28oz 302 flexplate. You sorta run the flexplate your transmission calls for. All 351m/400 and 351C are 28oz balanced thou, unless you change that.
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Lead Driver
Joined: Nov 2000
Posts: 6,635
Likes: 349
From: Albuquerque
Well great, I'm confused on a higher level now. Heh, heh. I still don't understand why NAPA offers two plates for the same engine (400ci), one without weight and one with. As I recall the one I'm using has a small weight on it, I think that would correspond to the 28oz. I have the standard large bell housing and a C6.
While I'm at it, the harmonic balancers were different originally for 351m,400. I think now you can only get one part number but I've read using a 351m on a 400 requires rebalance.
What you got for that number man.
Thanx all
While I'm at it, the harmonic balancers were different originally for 351m,400. I think now you can only get one part number but I've read using a 351m on a 400 requires rebalance.
What you got for that number man.
Thanx all
Postmaster
Joined: Mar 2011
Posts: 2,698
Likes: 7
From: Taxachusetts
Beartracks: Have you found a flexplate for your buggy yet? I have one that's in not too bad a shape - came off my (RIP) '79 Bronco. 400, C6, 164 Teeth, 28oz external balance. I'll never use it as long as my left knee holds out... I'm a die hard stick shift man.
PM me with your address....just cover the shipping cost.
PM me with your address....just cover the shipping cost.
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