not sure if this is in the right forum but here it goes.i plan on putting a 383 stroker in my 67 backed by a t56 6 speed.now the stock flywheel won't work with the 383 crank right?or am i wrong.because everything i've been reading about strokers is that the need a 400 flywheel,is that correct?i do have the stock flywheel for the t56.if i do need a special one what kind and where should i get it?any help would be appreciated. graemlins/waving.gif

We can't answer your question with out getting some more information from you. Who is the manufacturer of the crank? Can you call them and ask them how it needs to be balanced? If it is a stock GM 400 crank that has had it's mains turned down, then you will PROBABLY need a 400 flywheel with a 400 harmonic balancer. If it is an aftermarket crank, then you had better call the manufacturer as some of the A/M cranks require the use of a standard harmonic dampner with a 400 style flywheel, a 400 F/W w/400 balancer, and some other odd configurations.

What I am trying to say is this-we must know for certain how your crank was balanced before we can tell you what F/W & Harmonic balancer that you need. If you are buying a new crank, they should tell you what you need to make it work properly.

If you have a T-56 flywheel now, it is a neutral balance wheel, and you probably will not be able to use it without a weight adapter. That flywheel probably came from a one piece rear seal motor, and unless you are using a one piece rear seal block & crank, the bolt pattern will be different. If you are using the right crank for that flywheel, and your final application calls for a non neutral balanced wheel, PAW sells a piece of metal that gets sandwiched between the F/W and crank, to turn your neutral balanced F/W into a non neutral balanced F/W.. So you do have options. Tell us, what kind of block do you have? One piece or two? You would be best served buying the crank, balancer, and f/w as an assembly if you can afford it..

In addition to what Go69 said, it also depends on what T56 and bellhousing you plan on using.

There are three T56’s you could use. The LT1 version has a relatively short input shaft, the LS1 version has an input shaft of about 6.6 inches, and the Aftermarket version comes with a 7.1 inch input shaft which allows for a 0.5 inch spacer to adapt the T56 to an early bellhousing allowing the use of a mechanical clutch linkage.

McLeod is supposed to be bringing out a Modular Bellhousing which will allow either an LT1 or an LS1 T56 to be bolted to any early small block Chevy allowing the use of a mechanical clutch linkage.

Either the Aftermarket T56 or an LT1 or LS1 T56 with the McLeod bellhousing will permit the use of whatever flywheel and clutch (internally/externally balanced – one piece/two piece rear main seal) is appropriate for your stroker.

If you try to use an LT1 T56 with the factory LT1 bellhousing, you will need a special “pull” style clutch and a matching special flywheel and you’ll need to use the factory hydraulic clutch linkage. If your 383 is internally balanced, and has a one piece rear main seal (unlikely) you can use the factory flywheel. If you have a two piece rear main seal, you will need a special after market clutch and flywheel.

You can also use an LS1 T56 with the factory LS1 bellhousing, but you’ll need a relatively thin (0.375” or so) spacer, and you’ll need to use the factory hydraulic clutch linkage. However, any diaphragm clutch and flywheel (internally/externally balanced – one piece/two piece rear main seal) as required should work.

Good luck working through the various combo’s!

thanks guys,the only thing i have is the trans right now.i don't even have the block yet.i was planning on using a one piece seal block.i thought when i'm ready to do the motor i would contact one of the stroker manufacturers and see if maybe they can balance the kit with my flywheel.unless there is a better way.the trans itself is from a 97 trans am,so it is an lt1 t56.any more info would be great because i want to try to learn as much about this as possible before i start doing anything.