Crankshaft Question - ZR-1 Net Registry Forums

Jagdpanzer · 05-05-2008

I'm looking at picking up an unused LT5 crankshaft but unfortunately the seller does not have the original GM part number or know which model year engine it was made for.
Looking at the Parts Book on the ZR-1 Reg site I see there are three crankshaft PNs listed for model years 90, 91-92, and 93-95.
Does anybody know how to tell the differences between these crankshafts?
Will a crankshaft for an early year LT5 work satisfactorily in a 93-95 model year engine without modifications?
Thanks

rkreigh · 05-06-2008

not without rebalancing, the 93-95 had a different piston and rod that were a bit lighter. I think the crank will physically work, but need at a minimum a rebalance.

I'd talk to Marc Haibeck or Aaron Scott, LPE , ect.. to be sure I'm right.

05-05-2008	#1
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,658	Crankshaft Question I'm looking at picking up an unused LT5 crankshaft but unfortunately the seller does not have the original GM part number or know which model year engine it was made for. Looking at the Parts Book on the ZR-1 Reg site I see there are three crankshaft PNs listed for model years 90, 91-92, and 93-95. Does anybody know how to tell the differences between these crankshafts? Will a crankshaft for an early year LT5 work satisfactorily in a 93-95 model year engine without modifications? Thanks Last edited by Jagdpanzer; 05-05-2008 at 08:48 PM.

05-06-2008	#2
rkreigh Join Date: Jan 2004 Location: Alex VA Posts: 1,087	Re: Crankshaft Question not without rebalancing, the 93-95 had a different piston and rod that were a bit lighter. I think the crank will physically work, but need at a minimum a rebalance. I'd talk to Marc Haibeck or Aaron Scott, LPE , ect.. to be sure I'm right. __________________ 95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP)