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I need options, or recommendations i want to ls swap my 97 obs i was thinking ls3 or lm7 but im not sure
 

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Your options are endless, just depends on how deep your pockets are. LM7 would probably be the cheapest.
 

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I need options, or recommendations i want to ls swap my 97 obs i was thinking ls3 or lm7 but im not sure
best VALUE recommendation...LM7 easy to acquire and most durable. Been told by GM Engineer from the era that is probably the toughest production street engine (truck) ever designed. it is the platform that all LS engines later were based on. Very easy to pull more HP from but a few less bolt-on parts options. Bottom ends are crazy strong, will take 1000 hp as is. Been driving one everyday for 17+ years....can't even try to buy her new parts.
 
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