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06-28-2006, 10:25 PM
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#1
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Join Date: Jun 2006
Location: new baltimore, MI
Posts: 6
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Correct flex plate for a 79 400?
http://i55.photobucket.com/albums/g1...1/flywheel.jpg
Hey everyone. I'm new here so if I screw up with something dont get too mad at me. But anyways I have a question for all of you out there who have replaced a flex plate on a 79 400. I rebuilt the engine and took one similair to the one above off the engine. Now after looking at other set ups I am starting to wonder if this is the correct flex plate for the engine. It has one less hole and a rather large weight attached to the outside where the hole is missing. I was hoping some one could tell me weather or not this is the right one for that engine
Last edited by blackbird; 06-28-2006 at 10:37 PM.
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06-28-2006, 10:51 PM
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#2
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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__________________
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06-29-2006, 12:09 AM
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#3
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Stalker
Join Date: Aug 2004
Posts: 12,082
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A 400 SBC should have a externally balanced flywheel/flexplate and harmonic dampener. With that beign the case, you should be using a flexplate with sometype of weight on it. I would also just chekc to make sure you still ahve the motor as ext. balanced and check that you are using the correct harmonic balancer as well.
When i built my 383(w/ a true 400 crank) i had to use an older Impala 400 balancer and I had to get a weight welded to my T5 flywheel since i couldnt find a ext. balanced 153t flywheel for pre-86.
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06-29-2006, 08:04 PM
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#4
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Join Date: Jun 2006
Location: new baltimore, MI
Posts: 6
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I'm sorry i ment to say a the 400 is a pontiac block, not a chevy. I have heard that the pontiac 400 is internally balcanced, that is why i am wondering if this would be the correct flexplate. Sorry for the mix up, i appreciate your help.
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06-30-2006, 09:18 AM
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#5
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,476
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Quote:
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Originally Posted by blackbird
I'm sorry i ment to say a the 400 is a pontiac block, not a chevy. I have heard that the pontiac 400 is internally balcanced, that is why i am wondering if this would be the correct flexplate. Sorry for the mix up, i appreciate your help.
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Yea, I figured that just by looking at the color of the paint left on that flywheel 
- Justin
__________________
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06-30-2006, 11:49 AM
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#6
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Stalker
Join Date: Aug 2004
Posts: 12,082
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ah, i didnt even look at the pic, justin told me yesterday it was a pontiac block so i dunno then, sorry .
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06-30-2006, 04:57 PM
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#7
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NJFBOA Co-Founder
Join Date: Jul 2004
Location: All up in your kool aid!
Posts: 12,235
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pontiac only used 1 flywheel/flexplate spec their entire production run. any flexplate taht says it is for a pontiac will work.
i actually have one here if you need it. it is from a 1971 455 
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07-01-2006, 11:11 PM
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#8
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Join Date: Feb 2005
Location: west orange nj
Posts: 2,415
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i have a pontiac 400 engine out of a 76 ta im asking 300 its has the headers, dis, flywheel,water pump, it doesnt have the intake and carb if your intrested i was told that it was rebuilt never heard it run
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