Replacing the rods is a no-brainer. They don't cost much more than it does to magnaflux,polish, replace the rod bolts and re-size the stock rods. TRW pistons are a little too heavy IMO. You'd be better off with SRP or ICON. Replace the harmonic balancer. Make sure you use a Pontiac-competent machine shop. Have the block honed with torque plates. Make sure the main saddle alignment is dead-on. Keep your rod/main oil clearances to .002. Use an RAIV oil pump and you'll have plenty of oil pressure. Make sure EVERYTHING is clean when you assemble it and you'll have a docile street engine(depending on cam selection ) that will send the import jockies heading for the curb!!
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Dr. Thomas Sowell
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