If your cooling system is in stock configuration, the heater lines are the only way water will circulate out the back of the head. If you want to not use the heater, I would route the block output to the small pipe under the exhaust that goes back to the water pump inlet side.
If, however, you are using a cooling reroute that lets water out the back of the head, I don't see any issues with blocking them. From: [email protected] [mailto:[email protected]] On Behalf Of Frank Devocht Sent: Monday, August 22, 2011 3:32 PM To: [email protected] Subject: 323 heater question Anyone know if the 323 heater completely closes the coolant circuit when turned to cold (as opposed to the miata)? If this is the case then, with a closed thermostat, all the coolant would need to go through the small nipple, correct? IOW, if would be ok to simply block the heater lines on a 1.8 miatat with no ill effects for the coolant circuit / waterpump etc. http://mx-5.sabretooth.id.au/engineswap1/partswap1/21headrearnewmotor.jpg
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