Im almost done swapping my b18 into my crx shell but im not sure where i need to have the grounds coming from. Any help would be appreciated.

 

-thermostat to main engine harness
-valve cover to front core support (or near firewall if you prefer)
-transmission to lower subframe near battery
-battery negative to chassis and/or engine block

 

Some guys dont like em, but how about putting an Earthing Kit on it, that will cure all your woes. Stay away from any water flow areas, near the thermostat housing, water necks, radiator mounts, heater hose areas.

Most important, battery to engine or tranny, chassis to engine to tranny to chassis, bond the exhaust to chassis back there somewhere, keep grounds in plain sight if you can and away from the battery area where acid fumes will cause corrosion in the not too far future.

Natural grounds like Alternator to bracket to engine, AC compressor to bracket to engine, no harm in adding redundant grounds to things like that. Dont put a 14 gauge wire spliced into an 18 gauge to ground. Now back to the radiator, bond it to the frame up there but not to anything else. Clean the paint from your ground points and treat them to keep them from corroding later.