Ths TW's have pretty strong valve springs.....you shouldn't worry about what tolerances they have because their power band peaks at about 6000. If you do any mods to extendthe power (porting, more lift) you should upgrade the springs....JMO
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Dustin
89 Saleen GT Sport
Supercharged 306
Started her up 6/8/03
Old Motor
Supercharged 347
516 rwhp
553 rwtq
11.249@126.83
1997 Honda CBR 1100XX Super Blackbird
162 hp
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