Thanks

[Gary Bishop]

Thanks to NCRS National, John Waggoner, Vinnie Peters, and others for providing us with this new site.

[Joe L.]

Re: 1969 L-71 crank

Dan-----

The original crankshaft used for your 1969 L-71 was likely GM PART #3882842 which also may have carried this same casting number. It's also posible that it carried a '6223" casting number. The original L-71 crankshaft was a 1053 forging and was cross-drilled and parkerized (nitride journal finish).

The '7115' casting identification mark was, I believe, used for L-88/ZL-1 crankshafts. Originally, this was GM PART #3942411 and later GM #3967811. These crankshafts were the same as the L-71 except that they were of 5140 steel.

The GM #3882842 crankshaft was discontinued over 20 years ago, but the 3967811 was available until about 2 years ago. There are still some of these crankshafts "around" in NOS form. Although not originally used on your engine, this crankshaft will work perfectly (assuming that you have the reciprocating parts of the engine custom balanced as you should anyway), will be stronger than the original, and will be impossible to discern once assembled into the engine.

I have no experience with SCAT crankshafts but I expect that their forged units are comparable to GM forged, both in quality and price. You could also obtain a Crower, Lunati, or Callies aftermarket forged crankshaft. These will be superior to GM (not that it matters; the GM cranks are stronger than you'll ever need for street opertion) and they'll be undetectable once installed in the engine. All this DOES come at a price, though, so make sure you're prepared with lots of "green" if you decide to go this route.