80LS1T Posted December 28, 2002 Share Posted December 28, 2002 Ok since the LT1 pistons are "lightweight" can you just use any piston in them? Cause I thought that the whole rotating assemble was all lightweight stuff? I know you cant just use any crank in an LT1 with out balancing everything out again. What pistons work in an LT1? I am going to use the GM PM rods. Thanks for the help guys! Guy Quote Link to comment Share on other sites More sharing options...
Mudge Posted December 28, 2002 Share Posted December 28, 2002 Eh? You'll have to balance everything if you change anything internally. Why change them? I ran stock pistons 11.4:1 Quote Link to comment Share on other sites More sharing options...
80LS1T Posted December 29, 2002 Author Share Posted December 29, 2002 I thought I read some where that if you change pistons your crank will be unbalanced because the crank is balanced for lightweight pistons? I am not shaving my heads so I was wondering what pistons would get me to about 11:1 compression? Thanks, Guy Quote Link to comment Share on other sites More sharing options...
Mudge Posted December 29, 2002 Share Posted December 29, 2002 You could just use impala headgaskets, .026" which would raise compression a bit. The stock pistons have 7cc valve reliefs, so you could use that to help calculate what you need. http://docmudge.tripod.com/Tuning/compressionratiocalc.xls Quote Link to comment Share on other sites More sharing options...
80LS1T Posted December 29, 2002 Author Share Posted December 29, 2002 Well that would help but I would like to go with forged pistons. I am rebuilding the whole engine so I would rather not use the stock pistons. Thanks, Guy Quote Link to comment Share on other sites More sharing options...
Mudge Posted December 30, 2002 Share Posted December 30, 2002 IMO for a NA motor, forged pistons suck. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted December 30, 2002 Author Share Posted December 30, 2002 Well the reason I would like to go forged is because I might add a nitrous system later, like a 75 shot. Should I maybe go hypereutectic? I thought those were kinda the best of both worlds? Thanks, Guy Quote Link to comment Share on other sites More sharing options...
Mudge Posted December 30, 2002 Share Posted December 30, 2002 Stock pistons ARE Hypers, IMO yes it is an excellent NA piston, KBs have been run with a fair amount of nitrous with no problems provided you have a retard setup that keeps you from detonating. Hypers are going to be strong yet still maintain low expansion characteristics that a forged piston has issues with, when the car is cold forged pistons start with excessive clearance because of this, overall there is just no reason to run such a thing in an NA car especially when you aren't getting free strength without a few side effects. I'm just nitpicky, so its only my opinion, others may not agree but I think Hypers are the way to go, and I know some pro engine builders that agree. I wouldn't recommend it, but I've heard of a 200 shot on a stock bottom LT1, with 11:1 and nitrous, besides making sure the retard is there I'd probably go with KBs. Feel very free to get a more nitrous experienced opinion, I would probably try CamaroZ28.com and hit the nitrous forum. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted December 30, 2002 Author Share Posted December 30, 2002 Ok well heres my plan then... Stock crank (re-ground) GM PM rods And KB hyper pistons with 11:1 compression Will this work??? Thanks, Guy Quote Link to comment Share on other sites More sharing options...
80LS1T Posted December 31, 2002 Author Share Posted December 31, 2002 Ok I found some KB Flat top hypers for $237 (set) that will give me a 11.1:1 CR. What rings would you guys recommend. Thanks, Guy Quote Link to comment Share on other sites More sharing options...
80LS1T Posted January 2, 2003 Author Share Posted January 2, 2003 *bump* Quote Link to comment Share on other sites More sharing options...
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