Have my '87 V6 that requires a new crankshaft. Eagle makes it new, and it is offered through Summit. The only thing is that it stated it is for replacement "crank #817".
I THINK my crank says 991, but I am not positive. Anybody know if the #817 crank will fit and function properly, or does modifications have to be made? It also says "external balanced" for the Eagle crank.
Summit:
Eagle Specialty Products 10173817

 

187 is the 3.1 crank with 3.307" throw. If you use a 3.1 crank in your 2.8, you will need 3.1 pistons, and you will now have a 3.1

 

So, the #187 is a 3.1L's crankshaft then. More or less, it is creating a stroker if I was going to purchase it? I imagine that this would use shorter pistons??
Everything else is the same then, inlcuding the piston traveling order; don't need one piston going up when it should be going down.

 

The wristpins were moved in the 3.1 pistons, same firing order, same rods.

Yes, you are creating a "stroker"

 

Are only the 3.1 pistons required (w/ the crank) to create a stroker?

 

Yessir

 

Is it worth spending money on it, like what kind of gains do you get? What size pistons do I get?

 

Alright, I have the #817 crank ordered, along with the 3.1L pistons!!!! This will complete the engine build internally.
Being that I am changing this crankshaft out and will have it all internally balanced, what Harmonic Balancer do I purchase??? What about the Flexplate???

 

I'm such an id10t!

I transposed the casting numbers.

189 is the 3.307" stroke, 187 is the 2.99" stroke.

IF the crank you bought is a forging, it seems really low on cost.

If it is fact a forging, keep the crank and exchange the pistons for 2.8 pistons, if it is a stock nodular iron crank, I would call and change the crank to 3.1.