200* is not all that hot for an SBC..............new engines can run warmer than normal, but still...........
- Are you sure you got all the air out of the system?
Did you do the old Hot-rodder trick and drill a hole in the t-stat so it could bleed air?
What shape is your radiator in? Was is clear and clean inside?
Are you using an aftermarket water pump?
Belt tensions are good on W/P? No slippage?
If using an old radiator, does it have it's full capacity, or have some of the tubes been pinched off during repairs?
200* is not too high for a triple-digit summer day in traffic.............with the A/C on, I would suspect it will be 15 deg. higher........
Maybe you need a second fan...........one in front of the condenser and one behind the radiator.
Or go back to a mechanical fan on the engine and an electric for when the "air" is on.........
What RPM's do you turn at highway speed?
