454 flywheels

[f_inscreenname]

Sorry Mike I have to ask.
I think I have read a hundred posts on a hundred boards about this and I still don’t have an answer.
Will a 454 Gen IV flywheel work on a 454 Gen V motor?
I know they will bolt up but some say they are balanced differently and will cause issues. What do you all think?

[fogducker III]

I believe one block is "internally" balanced and the other is "externally" balanced, but not sure which is which, I think the older block is internally balanced.
I had a 1969 396 (same block as 454) and I think it was internally balanced and did not need the weighted flywheel....so basically, to answer your question, yes, there are different flywheels for the 454...

[f_inscreenname]

It's a late model Gen IV. Some where around mid 80's if that helps and it is externally balanced.

[mrfixxall]

The mark 396,402,427 were internally ballanced.the mark 4,gen 5 gen 6 454's from the factory are extrenally ballanced..Now if someone put a scat,eagle etc crankshaft in a 454 block then most machine shops will internally ballance the assenbly..all the factory flywheels for a 454 are the same unless someone fiddled with them..mark,gen flywheels will bolt up,its the small block ones that i was confuseing you with(2 piece vs 1 piece rear main seal)..

[f_inscreenname]

So just go with it and if it shakes out of the boat you will come to Maryland with a 40' trailer of left over shop things as gifts and to fix it? :kingme::kingme::kingme:

[gcarter]

This is a '93 Mark IV 454 14" flywheel.
I would say this is definately externally balanced.

http://www.donzi.net/forums/attachment.php?attachmentid=51854&stc=1&d=1256838165

[mrfixxall]

So just go with it and if it shakes out of the boat you will come to Maryland with a 40' trailer of left over shop things as gifts and to fix it? :kingme::kingme::kingme:

So if they viberate you want me to bring all of this over so we can swap out the goodies?

i suggest to have then checked with what you have or be safe and have everything ballanced..:)

[f_inscreenname]

I bet with that set up it would take and hour to build a couple 800hp BBC's and drop them in for me. What are you doing this weekend? :kingme:
The one I have is close but the weight looks like it may have been added on, Not sure and I'm at work. I'll have to show you a picture of it later.

[f_inscreenname]

Alright, here's mine. As I said it looks like the weight was added to the flywheel but if you still thing it's OK.....

http://img510.imageshack.us/img510/2316/14479242.jpg

[gcarter]

If you compare it to mine, it's pretty apparent some of the weight on yours is in a different location than mine.

[f_inscreenname]

I cant tell where your bolts holes are but when you put them side by side....... even the numbers are in the same place???

http://img405.imageshack.us/img405/6910/50201576.jpg

[fogducker III]

The numbers should tell you what the flywheel is from and should be on......:confused:

[gcarter]

I cant tell where your bolts holes are but when you put them side by side....... even the numbers are in the same place???

http://img405.imageshack.us/img405/6910/50201576.jpg
If you look at the two smaller "lugs" on the flywheels, yours are smaller than mine and located in slightly different positions.

[f_inscreenname]

We need straight on pictures to compare.

[mrfixxall]

OK here compare away :)

[gcarter]

OK, I stand corrected.....
They look the same to me.

http://www.donzi.net/forums/attachment.php?attachmentid=51889&stc=1&d=1256906392

[f_inscreenname]

I haven't checked yet and Mr F's is a Gen 5 also. They look close but I will make sure tonight. Thanks for you help by the way.

My re-ring kit comes in on Monday. I would love to get the bottom end out of the way. With the flywheel being right :crossfing: I could even get the transmission on.