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V · 12-11-2013, 04:12 PM

What is the stock, std. bore of an LS1/LS6 block?

More specifically, the 12561168 casting.

I've found new blocks (all same GMPP number 12561166), listing 3.900"(Scoggin-Dickey), 3.898"(JEGS), and 3.890"(SUMMIT) finished bore. GMPartsDirect says its same as 12561168 bore. Whats going on??

I have stock pistons I want to use. So I just want the stock bore as it would have came in a GM car, but I'm confused.

https://sdparts.com/details/gm-perfo...parts/12561166
http://www.jegs.com/i/GM-Performance...61166/10002/-1
http://www.summitracing.com/parts/na...1166/overview/
http://www.gmpartsdirect.com/results...umber=12561166

12-11-2013, 04:12 PM	#1
V Stalker Join Date: Aug 2004 Posts: 12,077 iTrader: (12)	Stock LS1 bore question... What is the stock, std. bore of an LS1/LS6 block? More specifically, the 12561168 casting. I've found new blocks (all same GMPP number 12561166), listing 3.900"(Scoggin-Dickey), 3.898"(JEGS), and 3.890"(SUMMIT) finished bore. GMPartsDirect says its same as 12561168 bore. Whats going on?? I have stock pistons I want to use. So I just want the stock bore as it would have came in a GM car, but I'm confused. https://sdparts.com/details/gm-perfo...parts/12561166 http://www.jegs.com/i/GM-Performance...61166/10002/-1 http://www.summitracing.com/parts/na...1166/overview/ http://www.gmpartsdirect.com/results...umber=12561166 Last edited by V; 12-11-2013 at 04:14 PM.