need help...

[rrelco]

so i converted my 350 to a 383, the 350 was a crate engine with a 2004r trans b& m flex plate.
my engine builder balanced the rotating assy as internal and asked for my flex plate so he could balance everything.

so now i have installed the RS700, it came with a flywheel for a 2 piece rear main and it stated internal balanced. my issue is is when i rev up to 3k i feel a vibration in the seat. i gave a friend a drive and he said i shouldn't drive it.

was i suppose to get a external balanced flywheel? the engine builder says if the flex plate had a weight attached to it then i should have.

the 350 was internal balance i assume....i know 400ci are external so i am very confused

[cornfedbill]

Some 383's are externally balanced. The two piece rear main cranks can be internally balanced better than the one piece which normally need a weighted flexplate or flywheel.



Did you confirm whether or not there was a weight on the flexplate? This would help you to know for sure.

[rrelco]

Some 383's are externally balanced. The two piece rear main cranks can be internally balanced better than the one piece which normally need a weighted flexplate or flywheel.

Did you confirm whether or not there was a weight on the flexplate? This would help you to know for sure.

i know this is internally balanced, the thing is the flex plate was on my 350 that is the confusion here! and i did see a weight on the flex plate.

[cornfedbill]

i know this is internally balanced, the thing is the flex plate was on my 350 that is the confusion here! and i did see a weight on the flex plate.

Did the machine shop add the weight?

[rrelco]

no it came that way

[cornfedbill]

no it came that way

Is this a one or two piece rear main seal crank?

[rrelco]

its a one piece rear main....i did some research and this motor was a create engine that i got from GM well went to there site and it states internal/external balanced i bought this with a flex-plate and the flex plate has a weight welded on.

i feel this is Keisler mistake and now i am fighting with them

[TheJDMan]

How is this a Keisler problem? Presumably they sold you what you ordered. Is it possible that your engine builder modified the flexplate when he balanced the rotating assy?

[cornfedbill]

The one piece cranks are normally (including the 350's) use a neutral balance harmonic damper and an externally balanced flexplate or flywheel. I just learned this from my machine shop as I am building a new one piece crank motor.

[rrelco]

How is this a Keisler problem? Presumably they sold you what you ordered. Is it possible that your engine builder modified the flexplate when he balanced the rotating assy?

I am not sure who is at fault here....my motor states that it is an internal/external 383 internal balanced with a external weighted flex plate. now that its a 5 speed it should have a external balanced fly wheel, well Keisler sent me a zero balanced flywheel. my engine builder balanced my 383 using my flexplate.

i told keisler that it was a automatic, if you go on to summit and search 350 or 383 complete engines and look at the specs they all come with a flexplate! and it says internal/external balance.

keisler states that you CAN NOT mix internal/external so that is what we are fighting about.
all i would like is for them to either sell me an external bal flywheel at there cost.