I have a 91 LS motor that i've had for awhile that spun a bearing back in 1999 but has been sitting after removal since then. I had'nt even given it much thought until my mechanic suggested a LS/VTEC today because I was complaining about low end torque. I told him about my motor but he said it would be better to get a 90-94 teggy motor that runs bring it to him. He said he'd pull my b16 put my b16 pistons in the LS block then slap my head on and reinstall for 1k. He said he'd charge 450 to install the LS/Vtec and 550 to pull and reinstall He said after spinning a bearing it increases the risk of it happening again,he also said it'd be expensive having the crank turned and so on. Can I just gradually rebuild this LS bottom end to make it reliable for a LS/Vtec? I can take it to local machine shops myself. Do I need aftermarket Rods,pistons etc to make this thing reliable or are LS/Vtec's just impossible to be reliable. What can of power can I can obtain with a gen 1 b16 head all the bolts on's and CTR intake cam on a 91 LS block? Should I raise compression? My mechanic was saying this was the cheapest way to obtain torque instead of rebuilding my b16.