Pins and rods on a 426 are the same as on a 413 or a 440 for that matter. Going .070 over or .060 over is maybe pushing it. The block would need to be sonic checked. Custom 413 pistons can be made that are oversized to any specification and any compression ratio. Check out http://www.rosspistons.com Sean On Jun 2, 2007, at 9:04 PM, Ray Jones wrote: > To use 426 pistons, you would have to deal with piston pin location > and > rod length compared to stock 413 pistons/rods. Likely the same, but ya > gotta know. > Ray > > On Jun 2, 2007, at 8:28 PM, John wrote: > > From Allpar.com: > > "The 413 saw a 4.18 inch hole which directly resulted in an easy leap > to the NASCAR limit of 426 cubic inches by boring the block to a 4.25 > inch diameter." > > So it would seem that 4.25 - 4.18 = .070" - If a 413 block could be > bored .070" with no problems, standard 426 pistons may be able to be > used. I've never done this, so I don't know if it's safe to do so. > > John Spiers > Lake Worth, FL > > [Non-text portions of this message have been removed] > > > [Non-text portions of this message have been removed] To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: mailto:Chrysler300-digest@xxxxxxxxxxxxxxx mailto:Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/