THERES A GREAT DEAL OF GOOD INFO IN THE LINKS ,YOULL BE CHEATING YOURSELF BADLY IF YOU DON,T READ THE SUB LINKED INFO If your looking for new pistons do some research, youll need to know the bore size, stroke, rod length, piston pin type,piston ring design , and at least a general idea on combustion chamber and valve size, valve diameter, and intended valve lift and cam timing to get clearances correct.and several other related facts before you can select the correct piston lets look at your options, obviously both your intended use and/or rpm range will effect the logical options as will your budget. your first option is between cast, hypereutectic and forged alloy pistons, cast are generally cheap and function well under low heat and load like normal driving, hypereutectic have a much stiffer alloy that has silicone added and these are slightly stronger, forged are significantly stronger , less likely to break,but more expensive your second common choice is selecting between 5.7" and 6" connecting rods. your third choice is between pressed and full float wrist pins. your fourth choice will depend on compression ration desired. examples, of cast and hyper pistons for a common 350-383 sbc, usually cost about $170-$250 per set of 8 forged will commonly run in the $370-$500 range per set but will be a better option if nitrous is used or you intend to run over 4000 feet per minute in piston speed frequently I HAVE ALWAYS PREFERRED FULL FLOATING PISTON PINS (that way you can self assemble the piston on each connecting rod) (which comes in handy when you need to change piston deck height/quench, and side clearance etc.) AND CUT TO FIT RINGS (which allow a true custom fit) and if possible forged pistons (which are more durable and less subject to as rapidly occurring damage from detonation) now I have zero problem using hyper-eutectic pistons in the proper applications because they work as well or at least as well as required with little or no down side if you remember the previous stated limitations related info http://www.kb-silvolite.com/calc.php?action=piston http://www.jepistons.com/TechCorner/HowToIdentify.aspx viewtopic.php?f=53&t=110&p=31943&hilit=2618+4032#p31943 viewtopic.php?f=69&t=7804&p=30277&hilit=2618+4032#p30277 viewtopic.php?f=53&t=4516&p=16279&hilit=2618+4032#p16279 READING THE LINKS WILL GO A LOOOOONG WAY TOWARD AVOIDING PROBLEMS http://www.babcox.com/editorial/ar/ar80125.htm http://en.wikipedia.org/wiki/Hypereutectic_piston viewtopic.php?f=53&t=5454 viewtopic.php?f=53&t=5064&p=14370#p14370 http://www.kb-silvolite.com/assets/auto ... ctions.pdf http://www.hotrod.com/techarticles/engi ... index.html viewtopic.php?f=53&t=509&p=632#p632 http://www.circletrack.com/techarticles ... index.html http://garage.grumpysperformance.co...g-and-installing-connecting-rods-pistons.247/ http://garage.grumpysperformance.co...tion-of-crank-durring-short-blk-assembly.852/ http://garage.grumpysperformance.com/index.php?threads/connecting-rod-strength-h-vs-i-beam.1168/ http://garage.grumpysperformance.com/index.php?threads/maximizing-piston-to-bore-ring-seal.3897/ http://garage.grumpysperformance.com/index.php?threads/piston-to-bore-clearance.4630/ http://garage.grumpysperformance.co...ng-and-basic-piston-ring-info-youll-need.509/ http://www.enginebuildermag.com/Article ... s_new.aspx http://www.aa1car.com/library/2003/eb40354.htm http://kb-silvolite.com/article.php?action=read&A_id=5 http://kb-silvolite.com/article.php?action=read&A_id=1 http://en.wikipedia.org/wiki/Hypereutectic_piston http://forums.nasioc.com/forums/showthread.php?t=907570 http://www.circletrack.com/techarticles ... index.html viewtopic.php?f=53&t=509&p=868&hilit=+total+seal+gapless#p868 http://www.techlinecoatings.com/article ... rticle.htm http://www.kb-silvolite.com/article.php ... ad&A_id=64 read these links http://arp-bolts.com/pages/technical_failures.shtml http://www.hotrod.com/techarticles/stee ... index.html here is where you, or your machine shop can screw things up on ring to bore seal, you need to have the cylinders bored and honed to the correct size specified by the manufacturer of the pistons,after MEASURING THE PISTONS to verify their size per the piston manufacturers instructions, then gap the rings per the ring manufacturers instructions, when you hone the bores,get and use block deck hone plates, during the hone process , keep in kind you want to use the same (STUDS OR BOLTS) the machine shop used and the same torque settings they used when the cylinders were honed with deck plates or the distortion of the bore and ring seal won,t be identical (exactly round)or ideal, keep in mind the piston side clearance must match what the piston manufacturer states.