Need 3rd Jen Ls/vtec Help

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Junior Member
I will take all the help I can get on this one, I am trying to obtain information on how to properly change a 3rd gen B18 LS motor over to a B18 LS w/a VTEC head. Which head is the best bang for the low buck? I have heard the term bullet-proof block, what does that mean? Please send any info and tips to
Thanx gang.