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Sorry guys but I don't see the big deal, we have two engines like this. One with W5's and one with ported eddies that both have been punished with nos
I've been Putin alot of nos to the duster engine for the last four years and it seems to be ok. Maybe we are just lucky

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good machine work goes along way! align hone the block with main studs, a good set of rods and lightweight pistons you should be fine. I had a 040 over 340 with a 318-3 race crank prepped 340 rods and ross 12.5 pistons with w2s with a 4spd and 489s. I drove it on the street and raced it for 7 years till it finally spun a bearing going through the traps @ 7500.