I say buy a b20 block, vtec conversion kit, new bearings, vrs kit..ect, arp b18c rod bolts and head studs, rs machine 84.5 type r pistons and rings.
Send your cylinder head, b20 block and your b18c crank to a machine shop and have the crank linished, block resurfaced and bored to suit new pistons and new pistons fitted to b18c rods.
When you get the block back reassemble engine with your new parts, i suggest buying an aftermarket girdle for the b20 main caps or reuse your b18c girdle on the b20 block but you will have to use the b18c main caps and get the machine shop to allign hone b18c main caps to the b20 block...do the cheaper option out of the two. This setup should give you a b20 with oem reliabilty
Also while your cylinder head is being serviced i would advise you ugrade your valvetrain to suit aggresive cams if you decide to upgrade later on.
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