Unbolt the convertor and pull it away from the flexplate and see if it makes noise that way. If not, something is amiss with the convertor.

 

You were my first comment
I didnt even see it
Didnt even think it wad my flexplate because it was new

 

End of crankshaft missmachined.

Flex plate not seated on the crank flange.

Ring gear not welded in-plane with flex plate.

Flex plate bent.

Are some of the more typical things that come to mind.

Bogie

 

"Weight on the flexplate" ??? Im thinking there should not be a weight on it. Am I mistaken?

 

Update
Took off the flywheel and checked it out
Everything looked good and it didnt look cracked
I will get a video of it once i run it again
I just got everything back together and going to make sure everything is tight
My only guess would be i have the wrong flexplate??
Flexplate has a weight on the side of the dowel pin
Instructions call for a late 350 flexplate
Am i correct on this?

 

Is it a1 or 2 piece rear main? If it has a non weighted balancer I would say it calls for a non weighted flywheel too.

 

1 peice
Says non weighted balancer
Late 350 weighted flexplate
On the instructions this is what is called for
Exact words

 

Update
Just fired her up and its the same problem
Im now thinking blueprint engines is wrong and it doesnt require a weighted flexplate
Either way i will be pissed off at somone
This flexplate is new and not cracked
Anyone want to give me some advice or the direction i should go in?

 

Wobbling side ways im pretty sure
I also feel the engine vibrate
Thought at first it was just out of tune

 

Are the flex plates going all the way through the crank flange and hitting the block?

 

Yes
Put it through the dowel pin and torqued her down to 65

 

Its a mild wobble and if i fire her up tomorrow i will record it and put it on youtube so everyone can see
I can hear it and thats why i dont like the way its acting

 

I did some research in the Summit catalog. You are right non weighted balancer and weighted flywheel. Still wondering if you have the right flywheel or if it is defective. The dowel indexes the flywheel to the proper location on the rear of the crankshaft. I take it you checked all that. And the flywheel is not reversed ? On backwards? (just putting it out there) Interested in seeing video.

 

Its not the heavy duty flexplate but its a pioneer
It is definitly on right and straight

 

Dumb question but it bears mentioning.

Are you using the correct process and torque specs to attach the flywheel? When we were kids, my brother bought a motor that the previous owner just went "around the clock" tightening the flexplate bolts to spec in one pass. This motor lasted about 1,000 miles before it grenaded. Also, the pete jackson geardrive and solid motormounts my brother insisted on both did a dandy job of covering up the problem until it blew.
Couldn't hear the noise or notice the vibration until it blew a window in the block and dented the oilpan on the highway at 2am LOL

Tap the flexplate with a mallet. it should ring like a bell. Move the mallet around, tapping firmly and slowly. If you find a dull sounding spot; you have a crack.

 

I have already taken out the flex plate and inspected it along with the back of the crank
Everything seems normal
I am torquing in a star pattern and can tell its torquing the flexplate bcause of the rings around the flexplate bolts are digging into the flexplate
I will loosen the converter and push it a little back for the video to show you guys
Everything looks good and idk what the problem could be

 

Everything helps
I will inspect the balancer today also

 

Flexplate is a FRA160
you can look it up on google to see a picture of it

 

https://youtu.be/PDwJYu5i3bQ
i will upload another when i fire her up again

 

I guess I'm confused. Flex plates are not terribly stiff to start with so they can flex a little bit out toward the starter teeth but if you feel play somewhere near the crank flange than I'd say perhaps you have a rear main problem. How much end play does the crank have? Should be .005 to .007 or so.

 

i shoukdnt have any problems with my engine
Its a crate motor from blue print
But everythi g is new except the torque converter

 

Update
Pulled off my tc bolts and tried to out everything back on
I have 2 bolts in and i cant fit the 3rd
My wholes from the flexplate and tc do not line up now
It never did this to me before
Sounding like my flexplate is the problem?
Ive never had these bolts not line up
Also the starter is starting to make a weird noise when cranking so i can get to the bolts

 

Check the distance from center and to each other for the torque converter, there are not only errors but different diameters.

Be sure the flex plate matches the crankshaft flange the 2 piece rear seal is larger and different from the one piece seal. The one piece seal flex plate also carries a small external counter balance that the 2 piece seal fp does not except on the 400.

Remove the starter to look at its mountings of the block, if it got jammed by the flexplate that might have cracked the block ears where the starter bolts on. Usually it's the outboard that eats it.

 

No you shouldn't have problems but its life.

The bolt circle are not perfect bolt circles so you cannot put things back together the wrong way. The balance pad is there for a reason and so putting it back together with the balance pad indexed incorrectly would defeat the purpose. Youll just have to start one and see how the others lined up. If they don't turn the TC and try again. Then mark it for reference next time.

 

UPDATE
i beleive i found the problem
I turned the engine over without the torque converter hooked up and it wobbling
I will post of video of this
Oreilly autoparts will get so much **** for this one

 

Does this mean you fired the engine with the torque converter loose?

Bogie

 

Be interesting to see it next to another flexplate. Either the weight is in the wrong spot or its drilled wrong

 

https://youtu.be/Z6jBLH99zc8

 

Hi, I read everything on u r post , I have never seen where u run a external flex plate an not an external balancer together, 350 are internal balanced, where as a 400 sbc is external balanced, you don't mix them up ...it can take out the bearings and the motor will vibrate, is there a part number on u r flex plate so u can look it up to see what it is for..it hope I helped some

 

the engine i have is a blueprint 355
Part nunber bp35512ctc1
It reguires a non weighted balancer type and late 350 weighted flexplate
Per instructions on my paper work

 

Flexplate part number
Fra160

 

going to napa to get an sfi approved flexplate
Not screwing around anymore