Correct flex plate for a 79 400?

[blackbird]

http://i55.photobucket.com/albums/g142/dduke911/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

[BonzoHansen]

Have you tried www.transamcountry.com ?

[V]

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.

[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.

[Tru2Chevy]

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.

Yea, I figured that just by looking at the color of the paint left on that flywheel ;)

- Justin

[V]

ah, i didnt even look at the pic, justin told me yesterday it was a pontiac block so i dunno then, sorry .

[NJSPEEDER]

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 :)

[chrisfrom nj]

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