This is true you usually don't need 4Bolt Mains unless you are over 400 HP and even if you are I would invest in conection rods and stronger rod bults first and formost as they are usually first to go South.(How many people do you know that have thrown a rod or spun a rod bearing verses had the crank fall out?) As far as splaid 4bolt caps go they really arn't too expensive but do require being align board at a machine shop (Summitracing.com has them for under$200) they are however much stronger than stock since they are splayed (angled) and lets face it any 4Bolt blocks out there are pricey and has probably been stressed papper thin, which makes a 2bolt block with splayed caps all that much more desirable!

If you need a tool and don't buy it, you will find you have paid for it and don't have it.