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check all your hoses and fittings. also check your thermostat housing. clean up the coolant and fill it back up and let it run to see if you can tell where it was coming from. also make sure you have a overflow tank. my pipe busted on mine and sprayed coolant all over my engine
On top of the block at the front is most likely the thermostat housing or the bypass hose. The coolant temperature sensor is up there also (in the front of the intake I believe).