Ls3 or ls7?
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Ls3 or ls7?
Getting ready to order an lsx block and rotating assembly. After running on nitrous this year I'm hooked and want to build a nitrous motor around 427 inch. I already have ls3 heads but want to go with a bigger cam. I can get a higher lift spring for the 3s but at a hefty price, or can go for the 7s with the bbc springs also at a hefty price. I guess what I'm asking is would the 7s be worth 3000+ bucks or an extra 1000 put into the 3s.