if you are going to do any serious racing then dont use the 557 block.With just street driving and RPMs under 5500 you should have no problems.SHOULD is the word.I built a street motor with the samr block,crank and light weight pistons and rods and made 585 HP at 6200 on the dyno.When it goes in the car it wont see 3000 more than a couple times a year.Tom
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