i'll say another word here about balancing. as i've said, i put trw flat tops in all my 455's. sd rods in 1, stock cast in the rest--all with pressed pins. i read that the trw's were exact replacements for the factory cast pistons, even avail in singles, for less than full set replacement. so, i figured they must be close enuff 2 the same weight 2 not require balancing--especially for the low rpm's i'd be turning. i'd also seen the sbc guys use trw's, even domes--never balancing anything--then turn em 7000 & they lived! so i took a chance that i'd be ok 2. never had a problem or noticed any bad vibrations or anything negative from not balancing. & again, thats thru 100's of races--1000's of passes. so, i have 2 say from my experience that if you use stock rods or replacements of = weight & trw flat tops--you'll be safe, unbalanced 2 at least 5000 rpm. but, if you've got the extra $--balance it. better safe than sorry--rite?
