87Aerocoupe

As the title states I got an Eagle 4340 forged 3.625 stroke 2pc crank and I want to use it in an LT1, I know it will physically fit but is there a flywheel that will work with the 2pc cranks?

MachinistOne

You'll need a rear main seal adapter for 2 piece cranks in late blocks, the flywheel is specific to the 1 piece vs 2 piece cranks and internal vs. external balance.

DAVE00

Yes - mine's been converted using the Eagle crank and rods (forged) with the Canton adaptor to convert it to a 2 piece. Here's a pic to giv you an idea:

Oilpumppickupweldedtopump.jpg?t=1242647722

twcblackhand6970

are there advantages to a 2piece over a 1piece?

DAVE00

Easier to change, that's about it. You don't have to remove the tranny, just drop the pan to get to it, so it's a toss up which one is easier. The reason I have one is my engine builder (9 years ago) was a circle track motor guy and he prefered the 2 piece as this is the standard in racing due to it being easier to replace. I'd personally just stick with the one piece design if I were you as it's easier to stay with stock components as if you go with the 2 piece as I did you will need a new flywheel and a new pan as the rear lip/half circle is smaller with the 2 piece.

87Aerocoupe

Well I hear you on staying with the stock configuration and I have an all forged 383 going together but it won't be ready until the end of the year.

But I also just got an Eagle 4340 3.625" stroke 2pc crank from someone who owed me money and I have a Centerforce billet flywheel for use with a 2pc crank in an LT1. So I figured I can get some forged pistons for a 6" rod 383 and some 6.125" rods and build a nice 370" motor to go with my new home ported heads, intake, 58 mm tb, LT's and 847 cam.

Opinions, feedback?

1996camaroSSclone

What pan is needed when converting?

DAVE00

This is the pan I ended up using:

http://store.summitracing.com/partde...5&autoview=sku

Also, if you want to use a 2 piece main conversion kit here is the one I am using from Canton:

http://store.summitracing.com/partde...0&autoview=sku

Good luck.

1996camaroSSclone

Thanks for the links

Mike

scottnorton

what flywheel did you run with your t56 thanks

DAVE00

I went with the Centerforce steel flywheel to match up with my CF DF clutch.