Author Topic: Odd flexplate question running 352 w/428 flexplate  (Read 845 times)

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Fordman

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Odd flexplate question running 352 w/428 flexplate
« on: April 25, 2022, 06:38:03 PM »
Just pulled a 1963 352. I was intrigued by the C3AE-H casting number as I havent previously had one in my stash and an obscure online post that "some" of these blocks came with the crossbolt knorbs,this block does not have heavy webbing or knobs. The casting has also been found to be 406 and 427 service replacement blocks. Anyways... I pulled it from a 63 mercury monterey breezeway back window 2 door with a cruise o matic. Upon teardown I noticed that the flexplate has a counterweight on it, the counterweight has the part # for-C6SP-6375-A-ASSY, it also has 184 teeth. Which a quick search says it's an early 428/428CJ flexplate.  It is one piece, not the 2 piece deal and a solid type flexplate,  no pie cuts. The engine does not look rebuilt. The seller I bought it from says it's a great runner but I'm wondering how it didnt shake itself to death. Am I missing something here?. Opinions appreciated.
« Last Edit: April 25, 2022, 06:44:12 PM by Fordman »

Rory428

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #1 on: April 25, 2022, 08:24:49 PM »
Does it have a counterweight chunk welded onto the flexplate? All 410/428 Flexplates do, but I have never seen an original Ford 428/428CJ or 428 SCJ flexplate that did not have the pie shaped cutouts . Even the early 2 piece 428 flexplates had the cutouts on the stamped steel section.
1978 Fairmont,FE 427 with 428 crank, 4 speed Jerico best of 9.972@132.54MPH 1.29 60 foot
1985 Mustang HB 331 SB Ford, 4 speed Jerico, best of 10.29@128 MPH 1.40 60 foot.
1974 F350 race car hauler 390 NP435 4 speed
1959 Ford Meteor 2 dr sedan. 428 Cobra Jet, 4 speed Toploader.

Fordman

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #2 on: April 25, 2022, 08:51:30 PM »
Yes Rory. It has the welded counterweight with the part # I posted.

Keith M

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #3 on: April 26, 2022, 01:29:41 AM »
On a 410 I bought, the flexplate had the weight but was solid, did not have the pie cuts. 

Keith

Rory428

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #4 on: April 26, 2022, 07:55:06 AM »
Keith, you must have an aftermarket flexplate then, I have seen jobber "428" flexplates that were solid, looks like they just welded the counterweight onto a 390 style flexplate. I often wondered why Ford punched out those triangular openings in the 410-428 flexplates. You would think that would tend to make the part weaker, although I never have had any issues with stock flexplates when I ran a transbraked C6 behind the 428 in my Fairmont drag car. JJ, I have to wonder how a 1966 dated piece could be for a 428 CJ/SCJ, since those versions did not come out until years later. And  the  SCJ had considerably heavier connecting rods than either the standard 428, or the CJ.
1978 Fairmont,FE 427 with 428 crank, 4 speed Jerico best of 9.972@132.54MPH 1.29 60 foot
1985 Mustang HB 331 SB Ford, 4 speed Jerico, best of 10.29@128 MPH 1.40 60 foot.
1974 F350 race car hauler 390 NP435 4 speed
1959 Ford Meteor 2 dr sedan. 428 Cobra Jet, 4 speed Toploader.

Fordman

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #5 on: April 26, 2022, 08:16:30 AM »
Rory.....I just googled that part# from the welded counterweight on the flexplate and that number comes up as an early 428cj flexplate. I don't understand what it's doing on a 1963 352 2bbl.

Gregwill16

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #6 on: April 26, 2022, 09:57:31 AM »
What crank is in it? First guess would be someone upgraded to a 410 rotating assembly at some point.

Fordman

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #7 on: April 26, 2022, 11:19:45 AM »
I wish!!. The crankshaft is a C4AE-A 352 crankshaft

Keith M

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #8 on: April 28, 2022, 01:45:25 AM »
Rory,
     Here is the flexplate that I have, its just like what Fordman says he has.  I have no doubt that this is a factory piece, maybe 410 only?  Totally unsure.  Checked the Mercury MPC and it only gives the part numbers for the two piece and single piece. 


pbf777

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #9 on: April 28, 2022, 10:46:03 AM »
     Here is the flexplate that I have, its just like what Fordman says he has.  I have no doubt that this is a factory piece,...........

     A long time ago as I remember, it was not unusual to order an aftermarket flex-plate and observing it having the Ford engineering numbers on the weight. Never looked into why this was, didn't compare the fonts trying to determine if perhaps it was the same supplier or not (of at least the weights anyway?) but it was such.    :-\

     Scott.

Fordman

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #10 on: April 28, 2022, 10:55:50 AM »
The flexplate that Kieth M posted a picture of is exactly the same as I have other than my counterweight is not drilled with balance holes. I still can't believe that this engine runs smoothly with this flexplate.

fomocoloco

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #11 on: May 01, 2022, 03:22:30 PM »
the C4 block had the crossbolt accommodation,

jim
9 65-72  f100 sb trucks 6 428's 1 460 2 521 strokers
1 66 f100 lb ranger
3 67-75 f350
numerous parts vehicles and parts

Fordman

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Re: Odd flexplate question running 352 w/428 flexplate
« Reply #12 on: May 03, 2022, 10:46:54 AM »
Yes I knew that, thank you. There are also C3AE-H and C5AE-A blocks that have the crossbolt knorbs.
« Last Edit: May 03, 2022, 01:06:00 PM by Fordman »