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Flexplate problem |
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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Imo, its better to go with what was given, any M11 or m12 flexplate will work, since you are having it rebalanced. To limit it to a 390 and 69 of all things, is greatly limiting your options, if trying to get it done ASAP.
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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dgordner
AMC Apprentice Joined: Feb/13/2009 Location: Pennsylvania Status: Offline Points: 124 |
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Ok. Thank you
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Safety is only what one makes of it!!! 1969 chevelle SS 1970 Elcamino SS
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dgordner
AMC Apprentice Joined: Feb/13/2009 Location: Pennsylvania Status: Offline Points: 124 |
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Can I have your phone number to talk to you.
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Safety is only what one makes of it!!! 1969 chevelle SS 1970 Elcamino SS
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3529 |
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Tag, you're it
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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Ha! I did not expect it. Just tried to simplify, the over thinking of what is going on. Down and Dirty should pop up with a link or two on what he has available. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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dgordner
AMC Apprentice Joined: Feb/13/2009 Location: Pennsylvania Status: Offline Points: 124 |
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May I call you to discuss? Don
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Safety is only what one makes of it!!! 1969 chevelle SS 1970 Elcamino SS
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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You need a flex plate from a 343 and have it match balanced to the 304 flex plate that is original to the engine. If you can't find a machine shop to do that locally, send it to me and I can get it done for you. Any flex plate that bolts to the M11/M12 will work but the one from a 343 will be the easiest to find. I will sell you one for $50.00 if you can't find a cheaper one.
Edited by SC397 - Jul/25/2021 at 2:56pm |
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3285 |
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As 304-Dude points out, Down & Dirty Dan’s has a ‘small hole’ flexplate available for a 343/360 V8 (Dan is not sure which) which would would work with an M11/M11B/M12 Borg Warner transmission. Get it match-balanced to your original(?) 304 flexplate and you should be good to go.
Basically, you’re trying to do something that’s not impossible but was not done by the factory - the 290 V8 was mated to an iron-case M11 only in the ‘68 & ‘69 AMX; for all other applications it was attached to an aluminum case BW M40. The 304 debuted in ‘70 and was not an option in the AMX; the only engine options fof the ‘70 AMX were a 360 or a 390. If you bought a ‘70 Javelin with a 304 it got an aluminum case BW M44. So a 304 mated to an iron-case Borg Warner M12, the strongest automatic transmission offered by AMC/Borg Warner from ‘68 to ‘71, designed to go behind torque-monster 390 & 401 V8’s, is a bit unusual. Just be aware that there will be more drivetrain power loss with the M12 than with a smaller trans. Oh, and I’m rubber you’re glue, everything bounces off me and sticks to you.
Edited by sweatlock - Jul/25/2021 at 9:39am |
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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Yes, I know this.
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dgordner
AMC Apprentice Joined: Feb/13/2009 Location: Pennsylvania Status: Offline Points: 124 |
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May I call you or you call me. 570-515-0379 evenings after 5 or anytime on weekends
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Safety is only what one makes of it!!! 1969 chevelle SS 1970 Elcamino SS
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