Inlet Manifold connections

[Andy Green]

Hi all,
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Now I’ve decided on what induction system to go for, I need some advice/confirmation on what the coolant connectors are for on this Inglese 302 IDA inlet manifold. <o:p></o:p>
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I presume the 2 bosses on the top are for the heater feed & temp sensor (I presume the heater feed is the higher boss). <o:p></o:p>
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The aftermarket thermostat cover I purchased (which I probably won’t use, as it points in the wrong direction) has a separate bleed. Does this go to the header tank?<o:p></o:p>
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I’ve also seen various threads about putting separate air bleed lines on these engines back to the header tank. Although this has been on the Holley/Edelbrock type set-ups, I was wondering whether I need to consider it for this type of manifold. The engine in my project is installed horizontal to the ground, if this makes any difference.<o:p></o:p>
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Regards<o:p></o:p>
Andy<o:p></o:p>

[John Oxborough]

Hi Andy
The small connection boss on your pictured thermo housing is for the by pass hose down to the water pump (enables circulation whilst thermostat is closed). I highly reccomend you fit a bleed pipe from the highest wet point on your engine( on a 40 usually on the top side of the top hose just before it dives downwards on route to the rad) back to a point above your water level in the header tank.
For good measure on the last 40 I restored I also put a bleed on the heater feed as on installation this ended up above the top hose, once filled with coolant the system will self bleed and air locks should not be a problem.
cheers
john

[Jon]

Andy,

You should have two temp senders in the manifold, one for the EFI and one for the instrument panel. Thats how the EFI system I have worked on is set up.